Search

Cheukfan Lee

Examiner (ID: 12249, Phone: (571)272-7407 , Office: P/2673 )

Most Active Art Unit
2625
Art Unit(s)
2627, 2673, 2622, 2612, 2676, 2616, 2682, 2722, 2625, 2674
Total Applications
2135
Issued Applications
1807
Pending Applications
66
Abandoned Applications
271

Applications

Application numberTitle of the applicationFiling DateStatus
Array ( [id] => 20441908 [patent_doc_number] => 12512750 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2025-12-30 [patent_title] => Energy extraction and utilization from the parasitic elements in power converters [patent_app_type] => utility [patent_app_number] => 18/373877 [patent_app_country] => US [patent_app_date] => 2023-09-27 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 28 [patent_figures_cnt] => 41 [patent_no_of_words] => 7651 [patent_no_of_claims] => 10 [patent_no_of_ind_claims] => 2 [patent_words_short_claim] => 329 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18373877 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/373877
Energy extraction and utilization from the parasitic elements in power converters Sep 26, 2023 Issued
Array ( [id] => 19407864 [patent_doc_number] => 20240291375 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-08-29 [patent_title] => CONTROL ARCHITECTURE AND SCHEMES TO REDUCE SWITCHING LOSSES IN DIRECT CURRENT (DC)-DC CONVERTERS [patent_app_type] => utility [patent_app_number] => 18/475797 [patent_app_country] => US [patent_app_date] => 2023-09-27 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 15548 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -22 [patent_words_short_claim] => 85 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18475797 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/475797
CONTROL ARCHITECTURE AND SCHEMES TO REDUCE SWITCHING LOSSES IN DIRECT CURRENT (DC)-DC CONVERTERS Sep 26, 2023 Pending
Array ( [id] => 20469839 [patent_doc_number] => 12525882 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2026-01-13 [patent_title] => External loop compensation apparatus and method and system thereof, and medium [patent_app_type] => utility [patent_app_number] => 18/873687 [patent_app_country] => US [patent_app_date] => 2023-09-25 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 5 [patent_figures_cnt] => 6 [patent_no_of_words] => 6119 [patent_no_of_claims] => 15 [patent_no_of_ind_claims] => 2 [patent_words_short_claim] => 224 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18873687 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/873687
External loop compensation apparatus and method and system thereof, and medium Sep 24, 2023 Issued
Array ( [id] => 19161811 [patent_doc_number] => 20240154518 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-05-09 [patent_title] => CONTROL METHOD AND CONTROL CIRCUIT FOR SMPS AND CONTROL CHIP [patent_app_type] => utility [patent_app_number] => 18/471765 [patent_app_country] => US [patent_app_date] => 2023-09-21 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 6696 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -15 [patent_words_short_claim] => 206 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18471765 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/471765
Control method and control circuit for switched-mode power supply with a power transistor and an inductor, and control chip Sep 20, 2023 Issued
Array ( [id] => 19286606 [patent_doc_number] => 20240223086 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-07-04 [patent_title] => BUCK-BOOST SWITCHING CONVERTER AND CONTROL METHOD THEREOF [patent_app_type] => utility [patent_app_number] => 18/471266 [patent_app_country] => US [patent_app_date] => 2023-09-20 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 6455 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -24 [patent_words_short_claim] => 179 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18471266 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/471266
BUCK-BOOST SWITCHING CONVERTER AND CONTROL METHOD THEREOF Sep 19, 2023 Abandoned
Array ( [id] => 19206860 [patent_doc_number] => 20240178759 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-05-30 [patent_title] => ELECTRICAL DEVICE INCLUDING BIDIRECTIONAL SWITCHING CONVERTER [patent_app_type] => utility [patent_app_number] => 18/238307 [patent_app_country] => US [patent_app_date] => 2023-08-25 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 9686 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 106 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18238307 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/238307
ELECTRICAL DEVICE INCLUDING BIDIRECTIONAL SWITCHING CONVERTER Aug 24, 2023 Pending
Array ( [id] => 18821836 [patent_doc_number] => 20230396177 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-12-07 [patent_title] => CONTROLLER APPLIED TO AN INDUCTOR-INDUCTOR-CAPACITOR RESONANT CONVERTER [patent_app_type] => utility [patent_app_number] => 18/234885 [patent_app_country] => US [patent_app_date] => 2023-08-17 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 5329 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -9 [patent_words_short_claim] => 176 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18234885 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/234885
CONTROLLER APPLIED TO AN INDUCTOR-INDUCTOR-CAPACITOR RESONANT CONVERTER Aug 16, 2023 Abandoned
Array ( [id] => 20674440 [patent_doc_number] => 12614967 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2026-04-28 [patent_title] => Control device for a switching voltage regulator having reduced audio noise and control method [patent_app_type] => utility [patent_app_number] => 18/451256 [patent_app_country] => US [patent_app_date] => 2023-08-17 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 7 [patent_figures_cnt] => 7 [patent_no_of_words] => 2090 [patent_no_of_claims] => 20 [patent_no_of_ind_claims] => 3 [patent_words_short_claim] => 189 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18451256 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/451256
Control device for a switching voltage regulator having reduced audio noise and control method Aug 16, 2023 Issued
Array ( [id] => 20147120 [patent_doc_number] => 12381469 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2025-08-05 [patent_title] => Pulse frequency modulation regulation and exit scheme using single comparator for power converter [patent_app_type] => utility [patent_app_number] => 18/450552 [patent_app_country] => US [patent_app_date] => 2023-08-16 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 4 [patent_figures_cnt] => 4 [patent_no_of_words] => 0 [patent_no_of_claims] => 24 [patent_no_of_ind_claims] => 2 [patent_words_short_claim] => 194 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18450552 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/450552
Pulse frequency modulation regulation and exit scheme using single comparator for power converter Aug 15, 2023 Issued
Array ( [id] => 20389632 [patent_doc_number] => 12489370 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2025-12-02 [patent_title] => Low power consumption feedback circuit for power supply device [patent_app_type] => utility [patent_app_number] => 18/366707 [patent_app_country] => US [patent_app_date] => 2023-08-08 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 2 [patent_figures_cnt] => 2 [patent_no_of_words] => 0 [patent_no_of_claims] => 9 [patent_no_of_ind_claims] => 1 [patent_words_short_claim] => 242 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18366707 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/366707
Low power consumption feedback circuit for power supply device Aug 7, 2023 Issued
Array ( [id] => 18787744 [patent_doc_number] => 20230376100 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-11-23 [patent_title] => METHODS AND APPARATUS TO REDUCE INRUSH CURRENT IN UNIVERSAL SERIAL BUS CIRCUITS AND SYSTEMS [patent_app_type] => utility [patent_app_number] => 18/364502 [patent_app_country] => US [patent_app_date] => 2023-08-03 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 12221 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -16 [patent_words_short_claim] => 108 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18364502 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/364502
METHODS AND APPARATUS TO REDUCE INRUSH CURRENT IN UNIVERSAL SERIAL BUS CIRCUITS AND SYSTEMS Aug 2, 2023 Pending
Array ( [id] => 19758635 [patent_doc_number] => 20250047200 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-02-06 [patent_title] => SINGLE INDUCTOR MULTIPLE OUTPUT REGULATOR [patent_app_type] => utility [patent_app_number] => 18/364175 [patent_app_country] => US [patent_app_date] => 2023-08-02 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 7810 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -22 [patent_words_short_claim] => 177 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18364175 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/364175
SINGLE INDUCTOR MULTIPLE OUTPUT REGULATOR Aug 1, 2023 Pending
Array ( [id] => 19758638 [patent_doc_number] => 20250047203 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-02-06 [patent_title] => CONTROL CIRCUIT FOR A POWER CONVERTER WITH ADAPTIVE ERROR SIGNAL COMPENSATION [patent_app_type] => utility [patent_app_number] => 18/362226 [patent_app_country] => US [patent_app_date] => 2023-07-31 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 5633 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -12 [patent_words_short_claim] => 185 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18362226 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/362226
CONTROL CIRCUIT FOR A POWER CONVERTER WITH ADAPTIVE ERROR SIGNAL COMPENSATION Jul 30, 2023 Pending
Array ( [id] => 19238130 [patent_doc_number] => 20240195325 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-06-13 [patent_title] => MULTIPHASE INVERTER CIRCUIT AND MODULATION METHOD [patent_app_type] => utility [patent_app_number] => 18/226451 [patent_app_country] => US [patent_app_date] => 2023-07-26 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 6845 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -19 [patent_words_short_claim] => 325 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18226451 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/226451
Multiphase inverter circuit for generating target AC power based on DC power provided by DC power supply and its modulation method Jul 25, 2023 Issued
Array ( [id] => 20147142 [patent_doc_number] => 12381491 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2025-08-05 [patent_title] => Method and apparatus for suppressing grid voltage imbalance [patent_app_type] => utility [patent_app_number] => 18/225164 [patent_app_country] => US [patent_app_date] => 2023-07-24 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 4 [patent_figures_cnt] => 6 [patent_no_of_words] => 2684 [patent_no_of_claims] => 13 [patent_no_of_ind_claims] => 2 [patent_words_short_claim] => 118 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18225164 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/225164
Method and apparatus for suppressing grid voltage imbalance Jul 23, 2023 Issued
Array ( [id] => 18906689 [patent_doc_number] => 20240022174 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-01-18 [patent_title] => Zeta-Based AC Link Universal Power Converter [patent_app_type] => utility [patent_app_number] => 18/223513 [patent_app_country] => US [patent_app_date] => 2023-07-18 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 7219 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 58 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18223513 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/223513
Zeta-Based AC Link Universal Power Converter Jul 17, 2023 Pending
Array ( [id] => 18899245 [patent_doc_number] => 20240014730 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-01-11 [patent_title] => POWER SUPPLY SEMICONDUCTOR DEVICE AND POWER SUPPLY APPARATUS [patent_app_type] => utility [patent_app_number] => 18/347944 [patent_app_country] => US [patent_app_date] => 2023-07-06 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 12319 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -8 [patent_words_short_claim] => 364 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18347944 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/347944
Power supply semiconductor device and power supply apparatus with discharge control circuit Jul 5, 2023 Issued
Array ( [id] => 19008599 [patent_doc_number] => 20240072670 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-02-29 [patent_title] => CONTROLLER FOR A BUCK-BOOST SWITCHING CONVERTER WITH OVERCURRENT AND NULL-CURRENT DETECTION AND METHOD FOR CONTROLLING A BUCK-BOOST SWITCHING CONVERTER [patent_app_type] => utility [patent_app_number] => 18/345525 [patent_app_country] => US [patent_app_date] => 2023-06-30 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 6622 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 339 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18345525 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/345525
Controller for a buck-boost switching converter with overcurrent and null-current detection and method for controlling a buck-boost switching converter Jun 29, 2023 Issued
Array ( [id] => 19688837 [patent_doc_number] => 20250007382 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-01-02 [patent_title] => METHOD AND APPARATUS FOR ESTIMATING VOLTAGE REGULATOR CURRENT [patent_app_type] => utility [patent_app_number] => 18/216016 [patent_app_country] => US [patent_app_date] => 2023-06-29 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 5587 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 109 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18216016 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/216016
Method and apparatus for estimating voltage regulator current Jun 28, 2023 Issued
Array ( [id] => 20441914 [patent_doc_number] => 12512756 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2025-12-30 [patent_title] => Constant on-time power converter with adjustable pulse duration and soft-start control [patent_app_type] => utility [patent_app_number] => 18/344340 [patent_app_country] => US [patent_app_date] => 2023-06-29 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 11 [patent_figures_cnt] => 16 [patent_no_of_words] => 3192 [patent_no_of_claims] => 23 [patent_no_of_ind_claims] => 3 [patent_words_short_claim] => 169 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18344340 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/344340
Constant on-time power converter with adjustable pulse duration and soft-start control Jun 28, 2023 Issued
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