Prosecution Insights
Last updated: October 26, 2026

David Thomas Karst, USPTO Patent Examiner

Listed by the USPTO as KARST, DAVID THOMAS

Tech Center 3900 • Art Units: 1632 1657 1671 1732 1748 1767 1796 3991

This examiner grants 65% of resolved cases

Analysis

KARST, DAVID THOMAS is assigned to tech center 3900 and art unit 1632. His profile includes 1013 resolved cases, an allowance rate of 64.8%, and a median of 1070 days to allowance. Interviews are associated with a 9.7% lift in the recorded allowance rate. The case volume supports using these measures as a directional reference for prosecution planning.

Covestro AG, Shin-Etsu Chemical Co., Ltd., and Eastman Chemical Company are the listed companies. The listed firms are THE WEBB LAW FIRM, P.C., BIRCH STEWART KOLASCH & BIRCH, LLP, and FITCH, EVEN, TABIN & FLANNERY, LLP. The interview association is positive but limited in relation to the allowance figure. Counsel may consider interviews while planning around the recorded median duration for chemical matters.

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

Performance Statistics

64.8%
Allow Rate
+4.8% vs TC avg
1,074
Total Applications
+9.7%
Interview Lift
1070
Avg Prosecution Days
Based on 1013 resolved cases, 2023–2026

Rejection Statute Breakdown

1.3%
§101 Eligibility
13.4%
§102 Novelty
49.2%
§103 Obviousness
27.5%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18284668 POLYESTER RESIN Final Rejection FUJIFILM CORPORATION
18390885 POLYMER, ORGANIC SEMICONDUCTOR MATERIAL, THIN FILM, AND ELECTRONIC DEVICE Non-Final OA Samsung Electronics Co., Ltd.
18043667 Color Stable Epoxy Compositions Final Rejection 3M INNOVATIVE PROPERTIES COMPANY
18559026 PARA-ARAMID FIBER AND PREPARATION METHOD THEREFOR Non-Final OA KOLON INDUSTRIES, INC.
18688731 HIGH-MOLECULAR COMPOUND, MOLDING COMPOSITION, FILM, AND CAPACITOR Non-Final OA Panasonic Intellectual Property Management Co., Ltd.
17623796 A COATING COMPOSITION, ITS PREPARATION METHOD AND USE THEREOF Non-Final OA BASF Coatings GmbH
18932752 HEAT-CURABLE MALEIMIDE RESIN COMPOSITION Final Rejection Shin-Etsu Chemical Co., Ltd.
18258467 COMPOSITION AND SHEET Non-Final OA Resonac Corporation
18691156 POWER STORAGE DEVICE PACKAGING MATERIAL, METHOD FOR PRODUCING SAME, FILM, AND POWER STORAGE DEVICE Non-Final OA DAI NIPPON PRINTING CO., LTD.
18549397 OILY INK COMPOSITION Final Rejection MITSUBISHI PENCIL COMPANY, LIMITED
18006749 RESIN COMPOSITION, FORMED ARTICLE, AND, ELECTROMAGNETIC WAVE ABSORBER Non-Final OA MITSUBISHI CHEMICAL CORPORATION
18393821 Polyamide 56 Composition with Reduced Moisture Absorption Non-Final OA TE Connectivity Solutions GmbH
18263416 SENSITIZER FOR NUCLEIC ACID AMPLIFICATION, COMPOSITION FOR NUCLEIC ACID AMPLIFICATION, AND TEST KIT Final Rejection NOF CORPORATION
18558889 Process for Ethoxylation of a Mixture of Straight Chain Fatty Alcohol and Branched Chain Fatty Alcohol in a Single Stage Reaction Final Rejection SABIC GLOBAL TECHNOLOGIES B.V.
18683019 POLYBENZOXAZOLE POWDER AND METHOD FOR PRODUCING THE SAME Non-Final OA TOYOBO MC Corporation
18270372 THERMOPLASTIC POLYESTER RESIN COMPOSITION, AND EXTRUSION-MOLDED ARTICLE COMPOSED THEREOF Final Rejection TOYOBO MC Corporation
18688160 PROCESS OF MAKING A COPOLYESTER WITH GERMANIUM CATALYST Non-Final OA Eastman Chemical Company
18688147 COPOLYESTERS COMPRISING 1,4-CYCLOHEXANEDIMETHANOL PRODUCED WITH GERMANIUM CATALYST Non-Final OA Eastman Chemical Company
18690427 Resin and Method for Manufacturing Same Non-Final OA LG Chem, Ltd.
18580087 POLY(3-HYDROXYPROPIONIC ACID) BLOCK COPOLYMER, MANUFACTURING METHOD THEREOF AND PRODUCTS CONTAINING THE SAME Non-Final OA LG CHEM, LTD.
18437303 BINDER COMPOSITE, ELECTROCHEMICAL APPARATUS, AND ELECTRIC APPARATUS Non-Final OA Ningde Amperex Technology Limited

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Frequently Asked Questions

What is examiner David Thomas Karst's allowance rate?

64.8% of resolved applications examined by David Thomas Karst were allowed (1,013 resolved cases), compared with 38.1% across Art Unit 1632 over the last five years.

Does an interview help with examiner David Thomas Karst?

This examiner's interview lift is +9.7 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner David Thomas Karst take to allow a patent?

Applications allowed by David Thomas Karst took 1,070 days on average from filing to allowance.

Which art unit does examiner David Thomas Karst work in?

David Thomas Karst examines applications in Art Unit 1632 in Tech Center 3900.

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