Search

Duc T. Doan

Examiner (ID: 5104, Phone: (571)272-4171 , Office: P/2135 )

Most Active Art Unit
2185
Art Unit(s)
2135, 2185, 2188
Total Applications
730
Issued Applications
596
Pending Applications
8
Abandoned Applications
129

Applications

Application numberTitle of the applicationFiling DateStatus
Array ( [id] => 20782914 [patent_doc_number] => 20260171112 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2026-06-18 [patent_title] => Tapered Optical And Magnetic Elements For Improved Writing In Heat-Assisted Magnetic Recording [patent_app_type] => utility [patent_app_number] => 19/355198 [patent_app_country] => US [patent_app_date] => 2025-10-10 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 2460 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -19 [patent_words_short_claim] => 92 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19355198 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/355198
Tapered Optical And Magnetic Elements For Improved Writing In Heat-Assisted Magnetic Recording Oct 9, 2025 Pending
Array ( [id] => 20617939 [patent_doc_number] => 20260088042 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2026-03-26 [patent_title] => MAGNETIC DISK DEVICE AND METHOD [patent_app_type] => utility [patent_app_number] => 19/323778 [patent_app_country] => US [patent_app_date] => 2025-09-09 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 2500 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -18 [patent_words_short_claim] => 298 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19323778 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/323778
MAGNETIC DISK DEVICE AND METHOD Sep 8, 2025 Pending
Array ( [id] => 20324331 [patent_doc_number] => 20250336419 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-10-30 [patent_title] => METHOD OF OPERATING HARD DISK DRIVES, CORRESPONDING HARD DISK DRIVE AND PROCESSING DEVICE [patent_app_type] => utility [patent_app_number] => 19/261523 [patent_app_country] => US [patent_app_date] => 2025-07-07 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 2877 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 142 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19261523 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/261523
METHOD OF OPERATING HARD DISK DRIVES, CORRESPONDING HARD DISK DRIVE AND PROCESSING DEVICE Jul 6, 2025 Pending
Array ( [id] => 20655658 [patent_doc_number] => 20260107690 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2026-04-16 [patent_title] => MAGNETIC SENSOR, MAGNETIC HEAD AND MAGNETIC RECORDING DEVICE [patent_app_type] => utility [patent_app_number] => 19/246485 [patent_app_country] => US [patent_app_date] => 2025-06-23 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 3981 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -16 [patent_words_short_claim] => 18 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19246485 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/246485
MAGNETIC SENSOR, MAGNETIC HEAD AND MAGNETIC RECORDING DEVICE Jun 22, 2025 Pending
Array ( [id] => 20429341 [patent_doc_number] => 20250391434 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-12-25 [patent_title] => Differential Voltage-Mode Driver for Microwave-Assisted Magnetic Recording [patent_app_type] => utility [patent_app_number] => 19/241637 [patent_app_country] => US [patent_app_date] => 2025-06-18 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 8547 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 96 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19241637 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/241637
Differential Voltage-Mode Driver for Microwave-Assisted Magnetic Recording Jun 17, 2025 Pending
Array ( [id] => 20617946 [patent_doc_number] => 20260088049 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2026-03-26 [patent_title] => MAGNETIC DISK DEVICE, CONTROL METHOD, AND LEARNING METHOD [patent_app_type] => utility [patent_app_number] => 19/189379 [patent_app_country] => US [patent_app_date] => 2025-04-25 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 1049 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -13 [patent_words_short_claim] => 166 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19189379 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/189379
MAGNETIC DISK DEVICE, CONTROL METHOD, AND LEARNING METHOD Apr 24, 2025 Pending
Array ( [id] => 20588345 [patent_doc_number] => 20260073941 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2026-03-12 [patent_title] => MAGNETIC DISK APPARATUS [patent_app_type] => utility [patent_app_number] => 19/189661 [patent_app_country] => US [patent_app_date] => 2025-04-25 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 4680 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -12 [patent_words_short_claim] => 111 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19189661 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/189661
MAGNETIC DISK APPARATUS Apr 24, 2025 Pending
Array ( [id] => 20791084 [patent_doc_number] => 12665000 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2026-06-23 [patent_title] => Magnetic disk apparatus [patent_app_type] => utility [patent_app_number] => 19/174570 [patent_app_country] => US [patent_app_date] => 2025-04-09 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 15 [patent_figures_cnt] => 19 [patent_no_of_words] => 12085 [patent_no_of_claims] => 20 [patent_no_of_ind_claims] => 4 [patent_words_short_claim] => 328 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19174570 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/174570
MAGNETIC DISK APPARATUS Apr 8, 2025 Issued
Array ( [id] => 20558116 [patent_doc_number] => 20260057902 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2026-02-26 [patent_title] => MAGNETIC DISK DEVICE [patent_app_type] => utility [patent_app_number] => 19/174841 [patent_app_country] => US [patent_app_date] => 2025-04-09 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 9527 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -8 [patent_words_short_claim] => 252 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19174841 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/174841
MAGNETIC DISK DEVICE Apr 8, 2025 Pending
Array ( [id] => 20732907 [patent_doc_number] => 12640167 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2026-05-26 [patent_title] => Magnetic tape drive, magnetic tape cartridge, and information management method [patent_app_type] => utility [patent_app_number] => 19/096736 [patent_app_country] => US [patent_app_date] => 2025-04-01 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 21 [patent_figures_cnt] => 21 [patent_no_of_words] => 12585 [patent_no_of_claims] => 16 [patent_no_of_ind_claims] => 6 [patent_words_short_claim] => 165 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19096736 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/096736
Magnetic tape drive, magnetic tape cartridge, and information management method Mar 31, 2025 Issued
Array ( [id] => 20283306 [patent_doc_number] => 20250308548 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-10-02 [patent_title] => LASER HEATER FEEDBACK CONTROL IN HEAT ASSISTED MAGNETIC RECORDING [patent_app_type] => utility [patent_app_number] => 19/090327 [patent_app_country] => US [patent_app_date] => 2025-03-25 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 8218 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 157 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19090327 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/090327
LASER HEATER FEEDBACK CONTROL IN HEAT ASSISTED MAGNETIC RECORDING Mar 24, 2025 Pending
Array ( [id] => 20441281 [patent_doc_number] => 12512121 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2025-12-30 [patent_title] => Preamplifier, disk device, control device, and analysis method [patent_app_type] => utility [patent_app_number] => 19/046244 [patent_app_country] => US [patent_app_date] => 2025-02-05 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 7 [patent_figures_cnt] => 7 [patent_no_of_words] => 6766 [patent_no_of_claims] => 14 [patent_no_of_ind_claims] => 4 [patent_words_short_claim] => 139 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19046244 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/046244
Preamplifier, disk device, control device, and analysis method Feb 4, 2025 Issued
Array ( [id] => 20019266 [patent_doc_number] => 20250157488 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-05-15 [patent_title] => MAGNETIC DISK DEVICE AND DOL SETTING METHOD [patent_app_type] => utility [patent_app_number] => 19/023600 [patent_app_country] => US [patent_app_date] => 2025-01-16 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 16262 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -7 [patent_words_short_claim] => 2 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19023600 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/023600
Magnetic disk device and DOL setting method Jan 15, 2025 Issued
Array ( [id] => 20564827 [patent_doc_number] => 12567441 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2026-03-03 [patent_title] => Magnetic recording device and a method for manufacturing the same [patent_app_type] => utility [patent_app_number] => 18/983016 [patent_app_country] => US [patent_app_date] => 2024-12-16 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 6 [patent_figures_cnt] => 8 [patent_no_of_words] => 0 [patent_no_of_claims] => 15 [patent_no_of_ind_claims] => 2 [patent_words_short_claim] => 281 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18983016 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/983016
Magnetic recording device and a method for manufacturing the same Dec 15, 2024 Issued
Array ( [id] => 20345785 [patent_doc_number] => 12469520 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2025-11-11 [patent_title] => Magnetic recording device and magnetic recording system [patent_app_type] => utility [patent_app_number] => 18/982619 [patent_app_country] => US [patent_app_date] => 2024-12-16 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 3 [patent_figures_cnt] => 5 [patent_no_of_words] => 0 [patent_no_of_claims] => 20 [patent_no_of_ind_claims] => 1 [patent_words_short_claim] => 167 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18982619 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/982619
Magnetic recording device and magnetic recording system Dec 15, 2024 Issued
Array ( [id] => 20681900 [patent_doc_number] => 20260120725 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2026-04-30 [patent_title] => Demodulation Circuit and Server [patent_app_type] => utility [patent_app_number] => 19/488701 [patent_app_country] => US [patent_app_date] => 2024-12-06 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 9343 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -18 [patent_words_short_claim] => 155 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19488701 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/488701
Demodulation Circuit and Server Dec 5, 2024 Pending
Array ( [id] => 20636561 [patent_doc_number] => 12597442 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2026-04-07 [patent_title] => Estimation and correction of eccentric phonograph record playback in digital audio recordings [patent_app_type] => utility [patent_app_number] => 18/964691 [patent_app_country] => US [patent_app_date] => 2024-12-02 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 13 [patent_figures_cnt] => 15 [patent_no_of_words] => 1133 [patent_no_of_claims] => 18 [patent_no_of_ind_claims] => 3 [patent_words_short_claim] => 248 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18964691 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/964691
Estimation and correction of eccentric phonograph record playback in digital audio recordings Dec 1, 2024 Issued
Array ( [id] => 20338735 [patent_doc_number] => 20250342855 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-11-06 [patent_title] => PROGRAMMABLE WRITER OVERDRIVE [patent_app_type] => utility [patent_app_number] => 18/957149 [patent_app_country] => US [patent_app_date] => 2024-11-22 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 0 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 95 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18957149 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/957149
Programmable writer overdrive Nov 21, 2024 Issued
Array ( [id] => 20291045 [patent_doc_number] => 20250316288 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-10-09 [patent_title] => MAGNETIC DISK DEVICE AND METHOD FOR ADJUSTING HEAD FLYING HEIGHT IN MAGNETIC DISK DEVICE [patent_app_type] => utility [patent_app_number] => 18/955139 [patent_app_country] => US [patent_app_date] => 2024-11-21 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 3880 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -18 [patent_words_short_claim] => 74 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18955139 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/955139
Magnetic disk device and method for adjusting head flying height in magnetic disk device Nov 20, 2024 Issued
Array ( [id] => 19820660 [patent_doc_number] => 20250078867 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-03-06 [patent_title] => DATA STORAGE DEVICE WITH FLEXIBLE LOGICAL TRACKS AND RADIUS-INDEPENDENT DATA RATE [patent_app_type] => utility [patent_app_number] => 18/952399 [patent_app_country] => US [patent_app_date] => 2024-11-19 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 12678 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -16 [patent_words_short_claim] => 2 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18952399 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/952399
DATA STORAGE DEVICE WITH FLEXIBLE LOGICAL TRACKS AND RADIUS-INDEPENDENT DATA RATE Nov 18, 2024 Pending
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