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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] => 18457100 [patent_doc_number] => 20230198382 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-06-22 [patent_title] => TOTEM-POLE BRIDGELESS POWER FACTOR CORRECTION CIRCUIT AND POWER ELECTRONICS DEVICE [patent_app_type] => utility [patent_app_number] => 18/167624 [patent_app_country] => US [patent_app_date] => 2023-02-10 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 7665 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -13 [patent_words_short_claim] => 376 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18167624 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/167624
TOTEM-POLE BRIDGELESS POWER FACTOR CORRECTION CIRCUIT AND POWER ELECTRONICS DEVICE Feb 9, 2023 Abandoned
Array ( [id] => 18395468 [patent_doc_number] => 20230163689 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-05-25 [patent_title] => Digital Average Input Current Control in Power Converter [patent_app_type] => utility [patent_app_number] => 18/158914 [patent_app_country] => US [patent_app_date] => 2023-01-24 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 4742 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 43 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18158914 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/158914
Digital Average Input Current Control in Power Converter Jan 23, 2023 Abandoned
Array ( [id] => 18380398 [patent_doc_number] => 20230155488 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-05-18 [patent_title] => CONVERSION CIRCUIT AND RELATED ELECTRONIC DEVICE [patent_app_type] => utility [patent_app_number] => 18/157270 [patent_app_country] => US [patent_app_date] => 2023-01-20 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 18884 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -19 [patent_words_short_claim] => 184 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18157270 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/157270
Conversion circuit with a capacitor module, balancing module and a startup module and related electronic device Jan 19, 2023 Issued
Array ( [id] => 18409450 [patent_doc_number] => 20230170803 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-06-01 [patent_title] => DRIVER CIRCUIT FOR A BUCK CONVERTER, RELATED INTEGRATED CIRCUIT, ELECTRONIC BUCK CONVERTER AND METHOD [patent_app_type] => utility [patent_app_number] => 18/154167 [patent_app_country] => US [patent_app_date] => 2023-01-13 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 7378 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 130 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18154167 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/154167
Control circuit for regulating output voltage of a buck converter during negative load transients Jan 12, 2023 Issued
Array ( [id] => 19306800 [patent_doc_number] => 20240235380 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-07-11 [patent_title] => ACTIVE SNUBBER CIRCUIT [patent_app_type] => utility [patent_app_number] => 18/151644 [patent_app_country] => US [patent_app_date] => 2023-01-09 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 6520 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 87 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18151644 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/151644
Active snubber circuit Jan 8, 2023 Issued
Array ( [id] => 18457134 [patent_doc_number] => 20230198416 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-06-22 [patent_title] => AUXILIARY POWER SUPPLY DEVICE [patent_app_type] => utility [patent_app_number] => 18/068689 [patent_app_country] => US [patent_app_date] => 2022-12-20 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 4519 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -6 [patent_words_short_claim] => 169 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18068689 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/068689
Auxiliary power supply device having resonant circuit Dec 19, 2022 Issued
Array ( [id] => 19250731 [patent_doc_number] => 20240201721 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-06-20 [patent_title] => LOW DROPOUT REGULATOR [patent_app_type] => utility [patent_app_number] => 18/083229 [patent_app_country] => US [patent_app_date] => 2022-12-16 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 5097 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -18 [patent_words_short_claim] => 43 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18083229 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/083229
LOW DROPOUT REGULATOR Dec 15, 2022 Pending
Array ( [id] => 18310732 [patent_doc_number] => 20230114632 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-04-13 [patent_title] => RESONANT RECTIFIED DISCONTINUOUS SWITCHING REGULATOR WITH INDUCTOR PREFLUX [patent_app_type] => utility [patent_app_number] => 18/065552 [patent_app_country] => US [patent_app_date] => 2022-12-13 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 14576 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -18 [patent_words_short_claim] => 68 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18065552 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/065552
Inductor flux control circuits Dec 12, 2022 Issued
Array ( [id] => 19237974 [patent_doc_number] => 20240195169 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-06-13 [patent_title] => Transformer-Hybrid Variable Reactance [patent_app_type] => utility [patent_app_number] => 17/803814 [patent_app_country] => US [patent_app_date] => 2022-12-08 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 2429 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -19 [patent_words_short_claim] => 45 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 17803814 [rel_patent_id] =>[rel_patent_doc_number] =>)
17/803814
Transformer-Hybrid Variable Reactance Dec 7, 2022 Pending
Array ( [id] => 19206845 [patent_doc_number] => 20240178744 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-05-30 [patent_title] => POWER SYSTEM WITH ADAPTIVE MINIMUM FREQUENCY [patent_app_type] => utility [patent_app_number] => 18/071853 [patent_app_country] => US [patent_app_date] => 2022-11-30 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 5808 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 52 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18071853 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/071853
Power system with adaptive minimum frequency Nov 29, 2022 Issued
Array ( [id] => 20318365 [patent_doc_number] => 12456923 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2025-10-28 [patent_title] => Switched-inductor power converter, communication system, and method coupled with leakage inductor [patent_app_type] => utility [patent_app_number] => 18/071358 [patent_app_country] => US [patent_app_date] => 2022-11-29 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 13 [patent_figures_cnt] => 19 [patent_no_of_words] => 5718 [patent_no_of_claims] => 20 [patent_no_of_ind_claims] => 3 [patent_words_short_claim] => 326 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18071358 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/071358
Switched-inductor power converter, communication system, and method coupled with leakage inductor Nov 28, 2022 Issued
Array ( [id] => 19206856 [patent_doc_number] => 20240178755 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-05-30 [patent_title] => FAST RECOVERY RESPONSE TO LOAD DUMPS IN A POWER CONVERTER SYSTEM [patent_app_type] => utility [patent_app_number] => 18/058829 [patent_app_country] => US [patent_app_date] => 2022-11-25 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 10223 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 203 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18058829 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/058829
FAST RECOVERY RESPONSE TO LOAD DUMPS IN A POWER CONVERTER SYSTEM Nov 24, 2022 Abandoned
Array ( [id] => 20147137 [patent_doc_number] => 12381486 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2025-08-05 [patent_title] => Delta-based current steering for power converter peak/valley current control [patent_app_type] => utility [patent_app_number] => 17/990098 [patent_app_country] => US [patent_app_date] => 2022-11-18 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 5 [patent_figures_cnt] => 6 [patent_no_of_words] => 0 [patent_no_of_claims] => 26 [patent_no_of_ind_claims] => 4 [patent_words_short_claim] => 98 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 17990098 [rel_patent_id] =>[rel_patent_doc_number] =>)
17/990098
Delta-based current steering for power converter peak/valley current control Nov 17, 2022 Issued
Array ( [id] => 19843124 [patent_doc_number] => 12255531 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2025-03-18 [patent_title] => Full-bridge resonant converter capable of suppressing high-frequency decoupling distortion [patent_app_type] => utility [patent_app_number] => 17/989692 [patent_app_country] => US [patent_app_date] => 2022-11-18 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 5 [patent_figures_cnt] => 5 [patent_no_of_words] => 3608 [patent_no_of_claims] => 8 [patent_no_of_ind_claims] => 1 [patent_words_short_claim] => 466 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 17989692 [rel_patent_id] =>[rel_patent_doc_number] =>)
17/989692
Full-bridge resonant converter capable of suppressing high-frequency decoupling distortion Nov 17, 2022 Issued
Array ( [id] => 18927808 [patent_doc_number] => 20240030812 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-01-25 [patent_title] => BOOTSTRAP CIRCUITRY FOR DRIVING A HIGH-SIDE SWITCH OF A SWITCHING CONVERTER [patent_app_type] => utility [patent_app_number] => 18/055842 [patent_app_country] => US [patent_app_date] => 2022-11-16 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 6380 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 104 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18055842 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/055842
Bootstrap circuitry for driving a high-side switch of a switching converter Nov 15, 2022 Issued
Array ( [id] => 20081279 [patent_doc_number] => 12355360 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2025-07-08 [patent_title] => Alternating current power supply circuit, control method thereof, and alternating current power supply with an efficient soft switching circuit [patent_app_type] => utility [patent_app_number] => 17/976579 [patent_app_country] => US [patent_app_date] => 2022-10-28 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 16 [patent_figures_cnt] => 16 [patent_no_of_words] => 8034 [patent_no_of_claims] => 16 [patent_no_of_ind_claims] => 3 [patent_words_short_claim] => 497 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 17976579 [rel_patent_id] =>[rel_patent_doc_number] =>)
17/976579
Alternating current power supply circuit, control method thereof, and alternating current power supply with an efficient soft switching circuit Oct 27, 2022 Issued
Array ( [id] => 18424648 [patent_doc_number] => 20230179113 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-06-08 [patent_title] => INTEGRATED CIRCUIT AND POWER SUPPLY CIRCUIT [patent_app_type] => utility [patent_app_number] => 17/972387 [patent_app_country] => US [patent_app_date] => 2022-10-24 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 13421 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -6 [patent_words_short_claim] => 264 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 17972387 [rel_patent_id] =>[rel_patent_doc_number] =>)
17/972387
Integrated circuit having amplitude-based switching control and power supply circuit containing the same Oct 23, 2022 Issued
Array ( [id] => 19131575 [patent_doc_number] => 20240136928 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-04-25 [patent_title] => CONTROL CIRCUIT FOR A BUCK-BOOST POWER CONVERTER [patent_app_type] => utility [patent_app_number] => 17/965356 [patent_app_country] => US [patent_app_date] => 2022-10-13 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 3883 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -12 [patent_words_short_claim] => 116 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 17965356 [rel_patent_id] =>[rel_patent_doc_number] =>)
17/965356
Control circuit for a buck-boost power converter Oct 12, 2022 Issued
Array ( [id] => 20508203 [patent_doc_number] => 12542485 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2026-02-03 [patent_title] => Bandwidth control in PLL-based power converter [patent_app_type] => utility [patent_app_number] => 17/934398 [patent_app_country] => US [patent_app_date] => 2022-09-22 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 9 [patent_figures_cnt] => 9 [patent_no_of_words] => 2354 [patent_no_of_claims] => 18 [patent_no_of_ind_claims] => 3 [patent_words_short_claim] => 160 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 17934398 [rel_patent_id] =>[rel_patent_doc_number] =>)
17/934398
Bandwidth control in PLL-based power converter Sep 21, 2022 Issued
Array ( [id] => 18297445 [patent_doc_number] => 20230107131 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-04-06 [patent_title] => SWITCHING MODE POWER SUPPLY WITH STABLE ZERO CROSSING DETECTION, THE CONTROL CIRCUIT AND THE METHOD THEREOF [patent_app_type] => utility [patent_app_number] => 17/946336 [patent_app_country] => US [patent_app_date] => 2022-09-16 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 3389 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -13 [patent_words_short_claim] => 132 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 17946336 [rel_patent_id] =>[rel_patent_doc_number] =>)
17/946336
Switching mode power supply with stable zero crossing detection, the control circuit and the method thereof Sep 15, 2022 Issued
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