Prosecution Insights
Last updated: October 26, 2026

Dennis John Sullivan, USPTO Patent Examiner

Listed by the USPTO as SULLIVAN, DENNIS JOHN

Tech Center 1600 • Art Units: 1642 1644 1646 1674

This examiner grants 58% of resolved cases

Analysis

Dennis John Sullivan is an examiner in Art Unit 1642 of Tech Center 1600. He has resolved 118 cases with an allowance rate of 57.6%. The median time to allowance is 1365 days. A high interview lift of 48.0% indicates that interviews are particularly effective for this examiner. This lift suggests that direct engagement can significantly increase the probability of allowance relative to the baseline rate.

Janssen Pharmaceuticals Inc., The Regents of the University of California, and University of Florida Research Foundation Inc. are his top corporate applicants. BakerHostetler, COOLEY LLP, and ArentFox Schiff, LLP & Memorial Sloan-Kettering are the top law firms. The 57.6% allowance rate and 1365 day median pendency provide a baseline for these pharmaceutical and academic applicants. The 48.0% interview lift is a critical strategic consideration.

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

Performance Statistics

57.6%
Allow Rate
-2.4% vs TC avg
167
Total Applications
+48.0%
Interview Lift
1365
Avg Prosecution Days
Based on 118 resolved cases, 2023–2026

Rejection Statute Breakdown

6.7%
§101 Eligibility
3.9%
§102 Novelty
42.0%
§103 Obviousness
27.0%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18565023 COMPOSITIONS AND METHODS TO TRANSFECT, TEST, AND TREAT SKIN CELLS Non-Final OA The Regents of the University of Michigan
17769171 COMPOSITIONS AND METHODS FOR DETECTING PLXDC1 AND PLXDC2 IN HUMAN TISSUES Final Rejection THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
17286083 Methods to Diagnose and Treat Cancer Using Non-Human Nucleic Acids Final Rejection The Regents of the University of California
18461081 NIDOGEN 1 AS A DIAGNOSTIC MARKER AND THERAPEUTIC TARGET OF HEPATOCELLULAR CARCINOMA, COMPOSITION AND METHODS THEREOF Final Rejection THE UNIVERSITY OF HONG KONG

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Who Appears Before This Examiner

Top companies before this examiner

Law firms appearing most often

Frequently Asked Questions

What is examiner Dennis John Sullivan's allowance rate?

57.6% of resolved applications examined by Dennis John Sullivan were allowed (118 resolved cases), compared with 38.5% across Art Unit 1642 over the last five years.

Does an interview help with examiner Dennis John Sullivan?

This examiner's interview lift is +48.0 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Dennis John Sullivan take to allow a patent?

Applications allowed by Dennis John Sullivan took 1,365 days on average from filing to allowance.

Which art unit does examiner Dennis John Sullivan work in?

Dennis John Sullivan examines applications in Art Unit 1642 in Tech Center 1600 (Biotechnology & Pharmaceuticals).

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