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] => 19083756 [patent_doc_number] => 20240110557 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-04-04 [patent_title] => LINEAR COMPRESSOR [patent_app_type] => utility [patent_app_number] => 18/207100 [patent_app_country] => US [patent_app_date] => 2023-06-07 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 16698 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -24 [patent_words_short_claim] => 145 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18207100 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/207100
Linear compressor Jun 6, 2023 Issued
Array ( [id] => 18676030 [patent_doc_number] => 20230313654 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-10-05 [patent_title] => SYSTEMS AND METHODS TO AUTONOMOUSLY OPERATE HYDRAULIC FRACTURING UNITS [patent_app_type] => utility [patent_app_number] => 18/205602 [patent_app_country] => US [patent_app_date] => 2023-06-05 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 15067 [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] => 18205602 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/205602
Systems and methods to autonomously operate hydraulic fracturing units Jun 4, 2023 Issued
Array ( [id] => 19615922 [patent_doc_number] => 20240401602 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-12-05 [patent_title] => BREATHER TUBE FOR LABYRINTH SEAL CHAMBER [patent_app_type] => utility [patent_app_number] => 18/203391 [patent_app_country] => US [patent_app_date] => 2023-05-30 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 3589 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -15 [patent_words_short_claim] => 55 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18203391 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/203391
Breather tube for labyrinth seal chamber May 29, 2023 Issued
Array ( [id] => 18650261 [patent_doc_number] => 20230296094 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-09-21 [patent_title] => THERMISTOR FLOW PATH [patent_app_type] => utility [patent_app_number] => 18/325410 [patent_app_country] => US [patent_app_date] => 2023-05-30 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 7626 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 216 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18325410 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/325410
Thermistor flow path May 29, 2023 Issued
Array ( [id] => 19083772 [patent_doc_number] => 20240110573 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-04-04 [patent_title] => VEHICLE ASSEMBLY COMPRISING A PRESSURE EQUALIZATION ELEMENT [patent_app_type] => utility [patent_app_number] => 18/140139 [patent_app_country] => US [patent_app_date] => 2023-04-27 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 12534 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -15 [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] => 18140139 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/140139
VEHICLE ASSEMBLY COMPRISING A PRESSURE EQUALIZATION ELEMENT Apr 26, 2023 Abandoned
Array ( [id] => 18583490 [patent_doc_number] => 20230265751 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-08-24 [patent_title] => SYSTEMS AND METHODS TO OPERATE A DUAL-SHAFT GAS TURBINE ENGINE FOR HYDRAULIC FRACTURING [patent_app_type] => utility [patent_app_number] => 18/138319 [patent_app_country] => US [patent_app_date] => 2023-04-24 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 16561 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -26 [patent_words_short_claim] => 228 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18138319 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/138319
Systems and methods to operate a dual-shaft gas turbine engine for hydraulic fracturing Apr 23, 2023 Issued
Array ( [id] => 19287985 [patent_doc_number] => 20240224468 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-07-04 [patent_title] => IMMERSION COOLING SYSTEM AND DELIVERY DEVICE THEREOF [patent_app_type] => utility [patent_app_number] => 18/136884 [patent_app_country] => US [patent_app_date] => 2023-04-20 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 3181 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -18 [patent_words_short_claim] => 86 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18136884 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/136884
IMMERSION COOLING SYSTEM AND DELIVERY DEVICE THEREOF Apr 19, 2023 Abandoned
Array ( [id] => 19498158 [patent_doc_number] => 20240337176 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-10-10 [patent_title] => HOLLOW ELECTRICAL SUBMERSIBLE PUMP FOR UNLIMITED WELLBORE INTERVENTION [patent_app_type] => utility [patent_app_number] => 18/298240 [patent_app_country] => US [patent_app_date] => 2023-04-10 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 5977 [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] => 18298240 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/298240
Hollow electrical submersible pump for unlimited wellbore intervention Apr 9, 2023 Issued
Array ( [id] => 18629000 [patent_doc_number] => 20230287880 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-09-14 [patent_title] => OPERATING MULTIPLE FRACTURING PUMPS TO DELIVER A SMOOTH TOTAL FLOW RATE TRANSITION [patent_app_type] => utility [patent_app_number] => 18/297762 [patent_app_country] => US [patent_app_date] => 2023-04-10 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 11963 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [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] => 18297762 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/297762
OPERATING MULTIPLE FRACTURING PUMPS TO DELIVER A SMOOTH TOTAL FLOW RATE TRANSITION Apr 9, 2023 Pending
Array ( [id] => 20094031 [patent_doc_number] => 20250223967 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-07-10 [patent_title] => PUMP SYSTEM [patent_app_type] => utility [patent_app_number] => 18/853652 [patent_app_country] => US [patent_app_date] => 2023-04-06 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 1189 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -14 [patent_words_short_claim] => 195 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18853652 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/853652
PUMP SYSTEM Apr 5, 2023 Pending
Array ( [id] => 19480370 [patent_doc_number] => 20240328412 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-10-03 [patent_title] => ADDITIVELY MANUFACTURED SELF-SUPPORTING ASYMMETRIC VALVE CORES [patent_app_type] => utility [patent_app_number] => 18/193347 [patent_app_country] => US [patent_app_date] => 2023-03-30 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 3677 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 78 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18193347 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/193347
ADDITIVELY MANUFACTURED SELF-SUPPORTING ASYMMETRIC VALVE CORES Mar 29, 2023 Abandoned
Array ( [id] => 18545743 [patent_doc_number] => 11719085 [patent_country] => US [patent_kind] => B1 [patent_issue_date] => 2023-08-08 [patent_title] => Systems and methods to autonomously operate hydraulic fracturing units [patent_app_type] => utility [patent_app_number] => 18/124721 [patent_app_country] => US [patent_app_date] => 2023-03-22 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 10 [patent_figures_cnt] => 10 [patent_no_of_words] => 14999 [patent_no_of_claims] => 26 [patent_no_of_ind_claims] => 4 [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] => 18124721 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/124721
Systems and methods to autonomously operate hydraulic fracturing units Mar 21, 2023 Issued
Array ( [id] => 20085933 [patent_doc_number] => 20250215869 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2025-07-03 [patent_title] => INVERTER-INTEGRATED ELECTRIC COMPRESSOR [patent_app_type] => utility [patent_app_number] => 18/850803 [patent_app_country] => US [patent_app_date] => 2023-03-21 [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] => -3 [patent_words_short_claim] => 100 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18850803 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/850803
INVERTER-INTEGRATED ELECTRIC COMPRESSOR Mar 20, 2023 Pending
Array ( [id] => 19346041 [patent_doc_number] => 20240255004 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-08-01 [patent_title] => TURBOMACHINE WITH COOLANT JACKET AND TURBULATOR INSERT MEMBER [patent_app_type] => utility [patent_app_number] => 18/184756 [patent_app_country] => US [patent_app_date] => 2023-03-16 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 5737 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -17 [patent_words_short_claim] => 131 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18184756 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/184756
Turbomachine with coolant jacket and turbulator insert member Mar 15, 2023 Issued
Array ( [id] => 20357916 [patent_doc_number] => 12473904 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2025-11-18 [patent_title] => Electrostatic micro-pump and a process to produce an electrostatic micro-pump [patent_app_type] => utility [patent_app_number] => 18/179055 [patent_app_country] => US [patent_app_date] => 2023-03-06 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 26 [patent_figures_cnt] => 28 [patent_no_of_words] => 7256 [patent_no_of_claims] => 18 [patent_no_of_ind_claims] => 2 [patent_words_short_claim] => 615 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18179055 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/179055
Electrostatic micro-pump and a process to produce an electrostatic micro-pump Mar 5, 2023 Issued
Array ( [id] => 19419044 [patent_doc_number] => 20240295167 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-09-05 [patent_title] => PACKING LUBRICATION SYSTEM FOR MULTIPLE PUMPING UNITS [patent_app_type] => utility [patent_app_number] => 18/117371 [patent_app_country] => US [patent_app_date] => 2023-03-03 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 5269 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -18 [patent_words_short_claim] => 83 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18117371 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/117371
PACKING LUBRICATION SYSTEM FOR MULTIPLE PUMPING UNITS Mar 2, 2023 Pending
Array ( [id] => 20608874 [patent_doc_number] => 12584468 [patent_country] => US [patent_kind] => B2 [patent_issue_date] => 2026-03-24 [patent_title] => Fluid system with a proppant mixing pump [patent_app_type] => utility [patent_app_number] => 18/175986 [patent_app_country] => US [patent_app_date] => 2023-02-28 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 3 [patent_figures_cnt] => 3 [patent_no_of_words] => 0 [patent_no_of_claims] => 19 [patent_no_of_ind_claims] => 3 [patent_words_short_claim] => 178 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => patent [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18175986 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/175986
Fluid system with a proppant mixing pump Feb 27, 2023 Issued
Array ( [id] => 18498136 [patent_doc_number] => 20230220839 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-07-13 [patent_title] => MECHANICALLY DRIVEN MODULAR DIAPHRAGM PUMP [patent_app_type] => utility [patent_app_number] => 18/112033 [patent_app_country] => US [patent_app_date] => 2023-02-21 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 7876 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -18 [patent_words_short_claim] => 371 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18112033 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/112033
Mechanically driven modular diaphragm pump Feb 20, 2023 Issued
Array ( [id] => 18530865 [patent_doc_number] => 20230235936 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2023-07-27 [patent_title] => METHOD FOR OPERATING STATUS DETERMINATION OF A REFRIGERANT COMPRESSOR/EXPANDER [patent_app_type] => utility [patent_app_number] => 18/166019 [patent_app_country] => US [patent_app_date] => 2023-02-08 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 8067 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -25 [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] => 18166019 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/166019
METHOD FOR OPERATING STATUS DETERMINATION OF A REFRIGERANT COMPRESSOR/EXPANDER Feb 7, 2023 Pending
Array ( [id] => 18971275 [patent_doc_number] => 20240051367 [patent_country] => US [patent_kind] => A1 [patent_issue_date] => 2024-02-15 [patent_title] => PRE-PRESSURIZED SYSTEM WITH REVERSE ROTATION OF PUMP FOR VALVE ACTUATION [patent_app_type] => utility [patent_app_number] => 18/165430 [patent_app_country] => US [patent_app_date] => 2023-02-07 [patent_effective_date] => 0000-00-00 [patent_drawing_sheets_cnt] => 0 [patent_figures_cnt] => 0 [patent_no_of_words] => 6265 [patent_no_of_claims] => 0 [patent_no_of_ind_claims] => -14 [patent_words_short_claim] => 245 [patent_maintenance] => 1 [patent_no_of_assignments] => 0 [patent_current_assignee] =>[type] => publication [pdf_file] =>[firstpage_image] =>[orig_patent_app_number] => 18165430 [rel_patent_id] =>[rel_patent_doc_number] =>)
18/165430
Pre-pressurized system with reverse rotation of pump for valve actuation Feb 6, 2023 Issued
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