Prosecution Insights
Last updated: October 27, 2026

David L Sorkin, USPTO Patent Examiner

Listed by the USPTO as SORKIN, DAVID L

Tech Center 1700 • Art Units: 1774 1793 1797 1799

This examiner grants 68% of resolved cases

Analysis

SORKIN, DAVID L is assigned to tech center 1700 and art unit 1774. The record contains 1193 resolved cases, with an allowance rate of 67.5% and a median of 1168 days to allowance. The high resolved-case volume gives the profile substantial historical depth, while the allowance rate indicates that prosecution outcomes are mixed across the record.

Interviews are associated with a 13.0% lift in allowance rate. Thermo Fisher Scientific, Bio-Energy Corporation, and Levitronix GmbH are the leading companies listed. The most frequently appearing firms are BIRCH STEWART KOLASCH & BIRCH, LLP, Bond, Schoeneck & King PLLC, and BOYLE FREDRICKSON S.C. The median timing supports early portfolio planning.

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

Performance Statistics

67.5%
Allow Rate
+2.5% vs TC avg
1,249
Total Applications
+13.0%
Interview Lift
1168
Avg Prosecution Days
Based on 1193 resolved cases, 2023–2026

Rejection Statute Breakdown

0.9%
§101 Eligibility
31.1%
§102 Novelty
33.6%
§103 Obviousness
28.2%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18510321 EDUCTOR Final Rejection Levitronix GmbH
18408226 FOOD MIXING MACHINE WITH ACCESSORY AND BOWL IDENTIFICATION AND ASSOCIATED CONTROL FUNCTIONS Non-Final OA ILLINOIS TOOL WORKS INC.
18414056 CHUTE FOR A MIXER VEHICLE Non-Final OA Oshkosh Corporation
18305538 PIPE SEGMENTS, NOZZLES, SYSTEMS AND METHODS FOR THERMOSET MANUFACTURING Non-Final OA The Boeing Company
18355902 CONDITIONING DRILLING FLUID Non-Final OA Saudi Arabian Oil Company
18608180 COATING SLURRY SUPPLY DEVICE Non-Final OA Kia Corporation
18595146 BOWL ASSEMBLY FOR A MICRO-PUREE MACHINE Final Rejection SharkNinja Operating LLC
18526216 MICRO PUREE MACHINE Non-Final OA SharkNinja Operating LLC
18114541 CORDLESS FOOD PROCESSOR Final Rejection WHIRLPOOL CORPORATION
18258432 HELICAL MIXER Non-Final OA Radiometer Medical ApS
18561592 CONTACTLESS ACOUSTOFLUIDIC SAMPLE AGITATOR AND USES THEREOF Non-Final OA CORNELL UNIVERSITY
18569137 DIRECT FEED PROPPANT SYSTEM Non-Final OA NATIONAL OILWELL VARCO, L.P.
18773834 MIXER, SYSTEM FOR APPLYING A BUILDING MATERIAL AND METHOD FOR PRODUCING A STRUCTURE FROM BUILDING MATERIAL Non-Final OA SIKA TECHNOLOGY AG
18690857 MIXING AND STIRRING APPARATUS, GYPSUM BOARD MANUFACTURING APPARATUS, AND GYPSUM BOARD MANUFACTURING METHOD Non-Final OA YOSHINO GYPSUM CO., LTD.
17920364 REFINER, INSTALLATION AND METHOD FOR TREATING COMPOSITE PRODUCTS Final Rejection SOPREMA

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Frequently Asked Questions

What is examiner David L Sorkin's allowance rate?

67.5% of resolved applications examined by David L Sorkin were allowed (1,193 resolved cases), compared with 58.5% across Art Unit 1774 over the last five years.

Does an interview help with examiner David L Sorkin?

This examiner's interview lift is +13.0 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner David L Sorkin take to allow a patent?

Applications allowed by David L Sorkin took 1,168 days on average from filing to allowance.

Which art unit does examiner David L Sorkin work in?

David L Sorkin examines applications in Art Unit 1774 in Tech Center 1700 (Chemistry & Materials).

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