Prosecution Insights
Last updated: April 19, 2026

Examiner: ANDREWS, DAVID L

Tech Center 3600 • Art Units: 3641 3672 3676

This examiner grants 72% of resolved cases

Performance Statistics

71.7%
Allow Rate
+19.7% vs TC avg
994
Total Applications
+16.2%
Interview Lift
1053
Avg Prosecution Days
Based on 967 resolved cases, 2023–2026

Rejection Statute Breakdown

0.5%
§101 Eligibility
26.5%
§102 Novelty
41.7%
§103 Obviousness
22.1%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
19335823 Fixed Cutter Drill Bits and Cutter Element with Secondary Cutting Edges for Same Non-Final OA National Oilwell Varco, L.P.
19334606 Fixed Cutter Drill Bits and Cutter Elements with Secondary Cutting Edges for Same Non-Final OA National Oilwell Varco, L.P.
19286667 INTERNAL SLIP INCLUDING ONE OR MORE SYMMETRICAL TEETH Non-Final OA Halliburton Energy Services, Inc.
19239373 ELECTRICALLY OPERATED LOW POWER COMPLETION CONTROL SYSTEM Final Rejection Halliburton Energy Services, Inc.
18959063 MAGNETICALLY COUPLED SUBSURFACE SAFETY VALVE Final Rejection Halliburton Energy Services, Inc.
18946709 NOISE CHARACTERIZATION IN FORMATION TESTING Non-Final OA Halliburton Energy Services, Inc.
18812687 DENSITY BASED DOWNHOLE FLUID SEPARATOR THAT CREATES ARTIFICIAL GRAVITY Non-Final OA Halliburton Energy Services, Inc.
18494395 SEALING ASSEMBLY EMPLOYING A CYLINDRICAL EXTRUSION LIMITER Non-Final OA Halliburton Energy Services, Inc.
17340984 COLLAPSIBLE SHELL PACKER FOR METAL-TO-METAL SEALING Final Rejection Halliburton Energy Services, Inc.
19325815 Tri-Axial Shock Absorber Sub Non-Final OA Stabil Drill Specialties, L.L.C.
19291064 RUPTURE DISC ASSEMBLY Non-Final OA NCS MULTISTAGE INC.
18804689 DOWNHOLE SEPARATOR Final Rejection Daniel J. Snyder
19244968 TECHNIQUES FOR CONNECTING WELLBORE TOOLS IN A TOOL STRING Non-Final OA DynaEnergetics Europe GmbH
18653272 DEVICES, SYSTEMS, AND METHODS FOR SELECTIVELY ENGAGING DOWNHOLE TOOL FOR WELLBORE OPERATIONS Non-Final OA ExxonMobil Technology and Engineering Company
19173236 Collecting Device with an Adjustable Filter Position and Method for Use Non-Final OA Baker Hughes Oilfield Operations, LLC
19193813 DOWNHOLE TOOL STRING Final Rejection Welltec A/S
18525227 CENTER ROD PLUNGER Non-Final OA Epic Lift Systems
18072214 DOUBLE SLEEVE PLUNGER Final Rejection Epic Lift Systems
18437750 Multi-Plunger Pumps and Associated Drive Systems Final Rejection U.S. Well Services Holdings, LLC
18429237 GEOLOGIC MATERIAL REMOVAL SYSTEM Non-Final OA EarthGrid PBC
18278419 PERCUSSION DRILLING APPARATUS AND METHOD FOR MEASUREMENT WHILE DRILLING Non-Final OA Rig Technologies International Pty Ltd
17202302 WIRELINE WELL ABANDONMENT TOOL Final Rejection WIRELINE ABANDONMENT CORP.

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