Prosecution Insights
Last updated: April 19, 2026

Examiner: MCCULLOUGH, ERIC J.

Tech Center 1700 • Art Units: 1773 1797

This examiner grants 30% of resolved cases

Performance Statistics

30.5%
Allow Rate
-34.5% vs TC avg
438
Total Applications
+43.4%
Interview Lift
1527
Avg Prosecution Days
Based on 393 resolved cases, 2023–2026

Rejection Statute Breakdown

0.6%
§101 Eligibility
13.9%
§102 Novelty
55.3%
§103 Obviousness
23.1%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18298533 ADSORPTION DESALINATION DIRECT CONTACT MEMBRANE DISTILLATION SYSTEM Non-Final OA KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
18987855 SYSTEM AND METHOD FOR ELECTRICALLY CONDUCTIVE MEMBRANE SEPARATION Non-Final OA SiTration, Inc.
17507982 MEDICAL DEVICES AND METHODS FOR MONITORING AND TREATMENT WITH SYNTHETIC POLYMERS EXHIBITING SPECIFIC BINDING Non-Final OA Boston Scientific Scimed, Inc.
17532773 POROUS POLYETHYLENE FILTER MEMBRANE, AND RELATED FILTERS AND METHODS Non-Final OA ENTEGRIS, INC.
17618222 PURE WATER MANUFACTURING MANAGEMENT SYSTEM AND PURE WATER MANUFACTURING MANAGEMENT METHOD Final Rejection MITSUBISHI HEAVY INDUSTRIES, LTD.
18040484 POLYMERIC COMPOSITE MEMBRANES HAVING ORIENTED NANOCHANNELS AND METHODS OF MAKING THE SAME Non-Final OA Yale University
13990011 FORWARD OSMOSIS HOLLOW FIBER MEMBRANE Non-Final OA NANYANG TECHNOLOGICAL UNIVERSITY
18012372 WATER PURIFIER CARTRIDGE, WATER PURIFIER INCLUDING THE SAME, AND WATER PURIFYING MEMBER Final Rejection UNITIKA LTD.
18873924 ZINC IMIDAZOLE SALICYLALDOXIME-BASED ADSORPTIVE MEMBRANES FOR REMOVAL OF METAL IONS FROM AQUEOUS SOLUTIONS Non-Final OA THE BOARD OF REGENTS OF THE UNIVERSITY OF OKLAHOMA
17579633 Purification and Enrichment of Boron Nitride Nanotube Feedstocks Non-Final OA Government of the United States, as represented by the Secretary of the Air Force
18248456 MEMBRANE WITH IMMOBILIZED ANTICOAGULANT AND PROCESS FOR PRODUCING SAME Final Rejection GAMBRO LUNDIA AB
17857580 Porous Composite Membrane for Solvent Extraction Non-Final OA New Jersey Institute of Technology
16767199 DIALYSIS MACHINE HAVING SECURITY AGAINST CONFUSION FOR HYDRAULIC CONNECTORS Final Rejection Fresenius Medical Care Deutschland GmbH
17996062 GLASS FIBER FREE FILTER MEDIUM WITH A DENSIFIED LAYER MADE OF SYNTHETIC FIBERS Final Rejection NEENAH GESSNER GmbH
18832495 POLYTETRAFLUOROETHYLENE (PTFE) MEMBRANES WITH GRADIENT PORE STRUCTURES AND METHODS FOR PREPARING THE SAME Final Rejection FEATURE-TEC (SHANGHAI) ADVANCED MATERIALS CO., LTD.
18678361 SELF-CLEANING FILTER Final Rejection Ahlstrom Oyj
17288989 POLYOLEFIN MICROPOROUS MEMBRANE AND LIQUID FILTER Non-Final OA Teijin Limited
17776799 FILTRATION COMPOSITES Non-Final OA Donaldson Company, Inc.
16970102 SUBSTRATE TREATMENTS Final Rejection Donaldson Company, Inc.
18441850 DISPOSABLE CELL REMOVAL SYSTEM Final Rejection EMD Millipore Corporation
18066610 ULTRAPOROUS NANOFIBER MATS AND USES THEREOF Final Rejection EMD Millipore Corporation
17530397 FILTER MEDIA INCLUDING FIBERS COMPRISING A MATRIX POLYMER AND IMPACT MODIFIER, AND RELATED METHODS Final Rejection Hollingsworth & Vose Company
18268915 MEMBRANE ATTACHMENT TECHNIQUE Final Rejection HYDROGEN MEM-TECH AS
18267023 PROCESS FOR ECONOMICAL PRODUCTION OF POLYMERS FROM NON-POLYMER-GRADE MONOMERS Non-Final OA UniSieve Ltd
18250379 FILTER FOR REMOVING SUBSTANCES FROM BLOOD Final Rejection Fresenius Hemocare Italia S.R.L.
18299755 FLUORORESIN MEMBRANE MATERIAL AND PRODUCTION PROCESS THEREFOR Non-Final OA TAIYO KOGYO CORPORATION
18048505 BIOLOGICAL FILTRATION SYSTEMS AND CONTROLLING METHODS THEREOF Final Rejection ALIT BIOTECH (SHANGHAI) CO., LTD.
17908756 REMOVAL OF SILICA AND TOTAL ORGANIC CARBON FROM WASTEWATER Final Rejection NanoWaterTech Inc.

Facing This Examiner?

IP Author analyzes examiner patterns and generates tailored response strategies with the highest chance of allowance.

Build Your Strategy

Sign in with your work email

Enter your email to receive a magic link. No password needed.

Personal email addresses (Gmail, Yahoo, etc.) are not accepted.

Free tier: 3 strategy analyses per month