Prosecution Insights
Last updated: October 02, 2026

Examiner: KEYWORTH, PETER

Tech Center 1700 • Art Units: 1777 1779 1794

This examiner grants 58% of resolved cases

Analysis

Peter Keyworth, working in Tech Center 1700 and Art Unit 1777, has resolved 794 cases with an allowance rate of 58.3 percent. The prosecution timeline is relatively long, with a median days to allowance of 1285. These figures suggest that while grants are achievable, the process requires persistence and a significant time investment to navigate the 58.3 percent baseline.

The most striking metric is the interview lift of 23.9 percent. This high lift indicates that interviews are exceptionally effective at moving cases toward allowance. For practitioners facing rejections, the data strongly supports the use of examiner interviews as a primary tool to bridge the gap between the examiner's position and the applicant's claims, significantly improving the odds over the 58.3 percent allowance rate.

Given the 1285 median days to allowance, applicants should be prepared for a multi-year prosecution cycle. However, the 23.9 percent interview lift provides a clear path to potentially accelerating this process. Strategy should prioritize early and frequent engagement with Keyworth to capitalize on his receptiveness to verbal arguments and to overcome the moderate baseline allowance rate.

Written from this page's own data; every figure is computed from USPTO records and verified before publication.

Performance Statistics

58.3%
Allow Rate
-6.7% vs TC avg
836
Total Applications
+23.9%
Interview Lift
1285
Avg Prosecution Days
Based on 794 resolved cases, 2023–2026

Rejection Statute Breakdown

1.1%
§101 Eligibility
13.2%
§102 Novelty
53.0%
§103 Obviousness
29.4%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18038265 Water Purification System With Inline Measurement Of Total Organic Carbon And Method Of Operating Such System Final Rejection Merck Patent GmbH
18514208 Filter for a Fluid Passageway Final Rejection Robert Bosch GmbH
18722865 WASTEWATER TREATMENT METHOD AND WASTEWATER TREATMENT SYSTEM Non-Final OA KUBOTA CORPORATION
18685535 WATER TREATMENT APPARATUS, METHOD FOR WASHING BIOLOGICAL MEMBRANE IN WATER TREATMENT APPARATUS, AND METHOD FOR EVALUATING THICKNESS OF BIOLOGICAL MEMBRANE IN WATER TREATMENT APPARATUS Non-Final OA KUBOTA CORPORATION
18508017 FILTRATION SEALING SYSTEM Final Rejection CUMMINS FILTRATION IP, INC.
16839174 CLEAN-IN-PLACE USING ULTRASOFT WATER Non-Final OA Ecolab USA Inc.
18728207 Moisture Removal Device and Method Non-Final OA W.L. Gore & Associates, Inc.
17870251 SLURRY RECYCLING FOR CHEMICAL MECHANICAL POLISHING SYSTEM Final Rejection Taiwan Semiconductor Manufacturing Co., Ltd.
18708649 PURIFICATION APPARATUS AND CONTROL METHOD Non-Final OA SHIMADZU CORPORATION
18312793 SYSTEM AND METHOD FOR REMOVING CARBON DIOXIDE FROM SEA WATER Non-Final OA Yale University
18568609 ELECTROCHEMICALLY-REGENERATED ION EXCHANGE USING REDOX-POLYMERS Non-Final OA THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
17437961 HYDROPHILIC COMPOSITE POROUS MEMBRANE Final Rejection TEIJIN LIMITED
18553453 PLANT AND PROCESS FOR REMOVING SUSPENDED SOLIDS, OILS AND GREASES FROM COOLING WATER IN THE STEEL AND METALLURGICAL SECTOR Final Rejection DANIELI & C. OFFICINE MECCANICHE S.P.A.

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