Search

Keith D. Walker

Supervisory Patent Examiner (ID: 7518, Phone: (571)272-3458 , Office: P/1735 )

Most Active Art Unit
1735
Art Unit(s)
1726, 1745, 1795, 1735
Total Applications
565
Issued Applications
152
Pending Applications
54
Abandoned Applications
362

Applications

Application numberTitle of the applicationFiling DateStatus
Array ( [id] => 20486505 [patent_doc_number] => 20260022703 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2026-01-22 [patent_title] => AIR BLOWER [patent_app_type] => utility [patent_app_number] => 19/299291 [patent_app_country] => US [patent_app_date] => 2025-08-13 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 9103 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -14 [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] => 19299291 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/299291
AIR BLOWER Aug 12, 2025 Pending
Array ( [id] => 20207768 [patent_doc_number] => 20250277488 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-09-04 [patent_title] => THERMISTOR FLOW PATH [patent_app_type] => utility [patent_app_number] => 19/214178 [patent_app_country] => US [patent_app_date] => 2025-05-21 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 2374 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 258 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19214178 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/214178
THERMISTOR FLOW PATH May 20, 2025 Pending
Array ( [id] => 20420776 [patent_doc_number] => 20250382861 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-12-18 [patent_title] => HYDRAULIC FRACTURING PUMPS TO ENHANCE FLOW OF FRACTURING FLUID INTO WELLHEADS AND RELATED METHODS [patent_app_type] => utility [patent_app_number] => 19/193832 [patent_app_country] => US [patent_app_date] => 2025-04-29 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 24331 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 266 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19193832 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/193832
HYDRAULIC FRACTURING PUMPS TO ENHANCE FLOW OF FRACTURING FLUID INTO WELLHEADS AND RELATED METHODS Apr 28, 2025 Pending
Array ( [id] => 20309816 [patent_doc_number] => 20250327445 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-10-23 [patent_title] => SYSTEMS AND METHODS FOR A GAS-DRIVEN COMPRESSOR [patent_app_type] => utility [patent_app_number] => 19/181646 [patent_app_country] => US [patent_app_date] => 2025-04-17 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 3489 [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] => 19181646 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/181646
SYSTEMS AND METHODS FOR A GAS-DRIVEN COMPRESSOR Apr 16, 2025 Pending
Array ( [id] => 20445714 [patent_doc_number] => 20260002431 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2026-01-01 [patent_title] => PUMP ASSEMBLY FOR DELIVERY OF FRACTURE FLUID [patent_app_type] => utility [patent_app_number] => 19/078227 [patent_app_country] => US [patent_app_date] => 2025-03-12 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 1066 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 146 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19078227 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/078227
PUMP ASSEMBLY FOR DELIVERY OF FRACTURE FLUID Mar 11, 2025 Pending
Array ( [id] => 20233182 [patent_doc_number] => 20250290501 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-09-18 [patent_title] => Strain-Actuated Microfluidic Pump Sensor [patent_app_type] => utility [patent_app_number] => 19/071580 [patent_app_country] => US [patent_app_date] => 2025-03-05 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 2993 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -4 [patent_words_short_claim] => 120 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19071580 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/071580
Strain-Actuated Microfluidic Pump Sensor Mar 4, 2025 Pending
Array ( [id] => 20100875 [patent_doc_number] => 20250230811 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-07-17 [patent_title] => FLUID END [patent_app_type] => utility [patent_app_number] => 19/058442 [patent_app_country] => US [patent_app_date] => 2025-02-20 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 48490 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 98 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19058442 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/058442
Fluid end Feb 19, 2025 Issued
Array ( [id] => 20041792 [patent_doc_number] => 20250180014 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-06-05 [patent_title] => MODULAR POWER END [patent_app_type] => utility [patent_app_number] => 19/046707 [patent_app_country] => US [patent_app_date] => 2025-02-06 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 38615 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -15 [patent_words_short_claim] => 22 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 19046707 [rel_patent_id] =>[rel_patent_doc_number] =>)
19/046707
Modular power end Feb 5, 2025 Issued
Array ( [id] => 19991554 [patent_doc_number] => 20250129776 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-04-24 [patent_title] => CORDLESS COMPRESSOR [patent_app_type] => utility [patent_app_number] => 18/985269 [patent_app_country] => US [patent_app_date] => 2024-12-18 [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] => -10 [patent_words_short_claim] => 89 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18985269 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/985269
CORDLESS COMPRESSOR Dec 17, 2024 Pending
Array ( [id] => 20050698 [patent_doc_number] => 20250188920 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-06-12 [patent_title] => POSITIVE DISPLACEMENT PUMP AND PUMP SYSTEM [patent_app_type] => utility [patent_app_number] => 18/966198 [patent_app_country] => US [patent_app_date] => 2024-12-03 [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] => -15 [patent_words_short_claim] => 110 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18966198 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/966198
POSITIVE DISPLACEMENT PUMP AND PUMP SYSTEM Dec 2, 2024 Pending
Array ( [id] => 19817618 [patent_doc_number] => 20250075825 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-03-06 [patent_title] => VIRTUAL VALVE IN A MEMS-BASED COOLING SYSTEM [patent_app_type] => utility [patent_app_number] => 18/954169 [patent_app_country] => US [patent_app_date] => 2024-11-20 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 13991 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 123 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18954169 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/954169
VIRTUAL VALVE IN A MEMS-BASED COOLING SYSTEM Nov 19, 2024 Pending
Array ( [id] => 19817397 [patent_doc_number] => 20250075604 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-03-06 [patent_title] => FRACTURING APPARATUS AND CONTROL METHOD THEREOF, FRACTURING SYSTEM [patent_app_type] => utility [patent_app_number] => 18/952120 [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] => 26236 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -19 [patent_words_short_claim] => 81 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18952120 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/952120
FRACTURING APPARATUS AND CONTROL METHOD THEREOF, FRACTURING SYSTEM Nov 18, 2024 Pending
Array ( [id] => 19755216 [patent_doc_number] => 20250043781 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-02-06 [patent_title] => THERMISTOR FLOW PATH [patent_app_type] => utility [patent_app_number] => 18/920324 [patent_app_country] => US [patent_app_date] => 2024-10-18 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 2683 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 232 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18920324 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/920324
THERMISTOR FLOW PATH Oct 17, 2024 Pending
Array ( [id] => 20180140 [patent_doc_number] => 20250264098 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-08-21 [patent_title] => INPUT/OUTPUT CALIBRATION OF PUMP [patent_app_type] => utility [patent_app_number] => 18/904708 [patent_app_country] => US [patent_app_date] => 2024-10-02 [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] => -1 [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] => 18904708 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/904708
INPUT/OUTPUT CALIBRATION OF PUMP Oct 1, 2024 Pending
Array ( [id] => 19693946 [patent_doc_number] => 20250012491 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-01-09 [patent_title] => COMPRESSOR AND REFRIGERATION DEVICE [patent_app_type] => utility [patent_app_number] => 18/890078 [patent_app_country] => US [patent_app_date] => 2024-09-19 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 3817 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -7 [patent_words_short_claim] => 59 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18890078 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/890078
COMPRESSOR AND REFRIGERATION DEVICE Sep 18, 2024 Pending
Array ( [id] => 19659220 [patent_doc_number] => 20240426285 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-12-26 [patent_title] => COMPRESSOR AND REFRIGERATION DEVICE [patent_app_type] => utility [patent_app_number] => 18/806204 [patent_app_country] => US [patent_app_date] => 2024-08-15 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 6423 [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] => 18806204 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/806204
COMPRESSOR AND REFRIGERATION DEVICE Aug 14, 2024 Pending
Array ( [id] => 19601886 [patent_doc_number] => 20240392766 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-11-28 [patent_title] => COMPRESSOR [patent_app_type] => utility [patent_app_number] => 18/797020 [patent_app_country] => US [patent_app_date] => 2024-08-07 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 6013 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 141 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18797020 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/797020
COMPRESSOR Aug 6, 2024 Pending
Array ( [id] => 19557265 [patent_doc_number] => 20240369057 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-11-07 [patent_title] => CYLINDER DEVICE FOR LINEAR COMPRESSOR INSTALLED WITH LINEAR PISTON [patent_app_type] => utility [patent_app_number] => 18/778158 [patent_app_country] => US [patent_app_date] => 2024-07-19 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 3283 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -4 [patent_words_short_claim] => 159 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18778158 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/778158
CYLINDER DEVICE FOR LINEAR COMPRESSOR INSTALLED WITH LINEAR PISTON Jul 18, 2024 Abandoned
Array ( [id] => 19587079 [patent_doc_number] => 20240384636 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-11-21 [patent_title] => SYSTEMS AND METHODS TO AUTONOMOUSLY OPERATE HYDRAULIC FRACTURING UNITS [patent_app_type] => utility [patent_app_number] => 18/776780 [patent_app_country] => US [patent_app_date] => 2024-07-18 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 15135 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 218 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18776780 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/776780
SYSTEMS AND METHODS TO AUTONOMOUSLY OPERATE HYDRAULIC FRACTURING UNITS Jul 17, 2024 Pending
Array ( [id] => 19863186 [patent_doc_number] => 20250101972 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-03-27 [patent_title] => COMPRESSOR [patent_app_type] => utility [patent_app_number] => 18/765466 [patent_app_country] => US [patent_app_date] => 2024-07-08 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 7097 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -14 [patent_words_short_claim] => 105 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18765466 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/765466
COMPRESSOR Jul 7, 2024 Pending
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