Prosecution Insights
Last updated: October 04, 2026

Examiner: KOLKER, DANIEL E

Tech Center 1600 • Art Units: 1644 1645 1649

This examiner grants 50% of resolved cases

Analysis

Daniel E Kolker is an examiner in Tech Center 1600 and Art Unit 1644. The examiner has 243 resolved cases. The allowance rate is 49.8%. This baseline rate indicates a challenging prosecution environment where rejections are common. The 243 resolved cases provide a substantial data set for evaluating historical performance.

The median days to allowance is 1410. This 1410-day median reflects the duration of the prosecution process for cases that reach issuance. Practitioners should factor this timeframe into their planning when their cases are assigned to Art Unit 1644.

The interview lift is 64.1%. This lift shows that conducting an interview is associated with an increased probability of success over the 49.8% allowance rate. Direct engagement with the examiner appears to be a highly effective strategy for resolving outstanding issues and advancing cases toward a favorable conclusion.

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

Performance Statistics

49.8%
Allow Rate
-10.2% vs TC avg
244
Total Applications
+64.1%
Interview Lift
1410
Avg Prosecution Days
Based on 243 resolved cases, 2023–2026

Rejection Statute Breakdown

3.7%
§101 Eligibility
21.2%
§102 Novelty
32.6%
§103 Obviousness
26.9%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
17843480 RECEPTORS PROVIDING TARGETED COSTIMULATION FOR ADOPTIVE CELL THERAPY Final Rejection INSTIL BIO (UK) LIMITED

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