Prosecution Insights
Last updated: October 27, 2026

Stephan J Essex, USPTO Patent Examiner

Listed by the USPTO as ESSEX, STEPHAN J

Tech Center 1700 • Art Units: 1727 1795

This examiner grants 66% of resolved cases

Performance Statistics

66.1%
Allow Rate
+1.1% vs TC avg
729
Total Applications
-16.5%
Interview Lift
1359
Avg Prosecution Days
Based on 699 resolved cases, 2023–2026

Rejection Statute Breakdown

0.7%
§101 Eligibility
17.2%
§102 Novelty
64.5%
§103 Obviousness
14.4%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18518818 POLYMER ELECTROLYTES AND BATTERIES WITH THE SAME Non-Final OA Toyota Motor Engineering & Manufacturing North America, Inc.
18281236 POROUS CARBON MATERIAL, METHOD FOR PREPARING THE SAME, ELECTRODE COMPRISING THE SAME, AND LITHIUM-SULFUR BATTERY Final Rejection LG Energy Solution, Ltd.
18270353 NEGATIVE ELECTRODE ACTIVE MATERIAL, METHOD FOR MANUFACTURING NEGATIVE ELECTRODE ACTIVE MATERIAL, NEGATIVE ELECTRODE COMPRISING NEGATIVE ELECTRODE ACTIVE MATERIAL, AND SECONDARY BATTERY COMPRISING SAME Final Rejection LG ENERGY SOLUTION, LTD.
18588509 BATTERY, ELECTRIC APPARATUS, AND METHOD AND APPARATUS FOR MANUFACTURING BATTERY Non-Final OA CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED
18468906 NON-AQUEOUS ELECTROLYTE AND SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK AND ELECTRICAL DEVICE CONTAINING THE SAME Final Rejection CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
18446162 ELECTRODE ASSEMBLY AND MANUFACTURING METHOD AND DEVICE, BATTERY CELL, BATTERY, ELECTRIC DEVICE Non-Final OA CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
18488847 RECHARGEABLE BATTERY MODULE Non-Final OA SAMSUNG SDI CO., LTD.
18792236 NOVEL BATTERY SYSTEMS BASED ON TWO-ADDITIVE ELECTROLYTE SYSTEMS Non-Final OA Tesla, Inc.
18605202 BATTERY SYSTEMS BASED ON LITHIUM DIFLUOROPHOSPHATE Final Rejection Tesla, Inc.
18467433 Cross-Linkable Solid Electrolyte Membrane for All-Solid-State Batteries and Method of Manufacturing the Same Non-Final OA IUCF-HYU (Industry-University Cooperation Foundation Hanyang University)
18516377 BATTERY PACK COVER Non-Final OA GM GLOBAL TECHNOLOGY OPERATIONS LLC
18499726 MULTI-FUNCTION BEAM WITH INTEGRATED STRUCTURAL, COOLING, AND TRANSVERSE ELASTIC COMPLIANCE FUNCTIONS FOR USE WITH ELECTRIC VEHICLE BATTERY PACKS Non-Final OA GM GLOBAL TECHNOLOGY OPERATIONS LLC
18546429 COMPOSITION FOR ELECTROCHEMICAL DEVICE FUNCTIONAL LAYER, FUNCTIONAL LAYER FOR ELECTROCHEMICAL DEVICE, LAMINATE FOR ELECTROCHEMICAL DEVICE, AND ELECTROCHEMICAL DEVICE Final Rejection ZEON CORPORATION
18611736 LITHIUM-ION BATTERY Non-Final OA PRIMEARTH EV ENERGY CO., LTD.
18371017 ELECTROCHEMICAL APPARATUS AND ELECTRONIC APPARATUS Non-Final OA Ningde Amperex Technology Limited
17102585 GRAPHENE FOAM-BASED PROTECTIVE LAYER FOR AN ANODE-LESS ALKALI METAL BATTERY Non-Final OA Global Graphene Group, Inc.
16927404 Rolled 3D Aluminum Secondary Batteries Non-Final OA Global Graphene Group, Inc.

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Frequently Asked Questions

What is examiner Stephan J Essex's allowance rate?

66.1% of resolved applications examined by Stephan J Essex were allowed (699 resolved cases), compared with 61.3% across Art Unit 1727 over the last five years.

Does an interview help with examiner Stephan J Essex?

This examiner's interview lift is -16.5 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Stephan J Essex take to allow a patent?

Applications allowed by Stephan J Essex took 1,359 days on average from filing to allowance.

Which art unit does examiner Stephan J Essex work in?

Stephan J Essex examines applications in Art Unit 1727 in Tech Center 1700 (Chemistry & Materials).

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