Prosecution Insights
Last updated: October 27, 2026

Brian D Keller, USPTO Patent Examiner

Listed by the USPTO as KELLER, BRIAN D

Tech Center 3700 • Art Units: 3700 3723 3761

This examiner grants 58% of resolved cases

Analysis

KELLER, BRIAN D is a USPTO patent examiner in tech center 3700 and art unit 3700. The record includes 473 resolved cases, an allowance rate of 58.4%, and a median of 1164 days to allowance. Interview lift is 37.7%, making interviews a prominent practical consideration in this prosecution record and a potential way to focus discussion of claim distinctions.

The leading companies are Aqua Craft Tools LLC, Rohm and Haas Electronic Materials Cmp Holdings Inc., and TCL Zhonghuan Renewable Energy Technology Co. Ltd. The leading firms are Bayramoglu Law Offices LLC, PVIP, and Ward Law Office LLC. Counsel should connect any interview request to specific claim or technical issues, while planning for the recorded pendency period and maintaining a detailed written follow-up.

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

Performance Statistics

58.4%
Allow Rate
-11.6% vs TC avg
491
Total Applications
+37.7%
Interview Lift
1164
Avg Prosecution Days
Based on 473 resolved cases, 2023–2026

Rejection Statute Breakdown

0.4%
§101 Eligibility
18.5%
§102 Novelty
46.0%
§103 Obviousness
31.6%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18283222 LIGHTWEIGHT FASTENER AND CUSTOMIZED DRIVE APPARATUS THEREOF Non-Final OA NORM IZMIR CIVATA SANAYI TICARET ANONIM SIRKETI

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Frequently Asked Questions

What is examiner Brian D Keller's allowance rate?

58.4% of resolved applications examined by Brian D Keller were allowed (473 resolved cases), compared with 66.1% across Art Unit 3700 over the last five years.

Does an interview help with examiner Brian D Keller?

This examiner's interview lift is +37.7 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Brian D Keller take to allow a patent?

Applications allowed by Brian D Keller took 1,164 days on average from filing to allowance.

Which art unit does examiner Brian D Keller work in?

Brian D Keller examines applications in Art Unit 3700 in Tech Center 3700 (Medical Devices & Mechanical Engineering).

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