Prosecution Insights
Last updated: October 04, 2026

ESS Tech Inc.

Technology area: Chemistry & Materials

3 pending office actions • 1 art units • 3 examiners • 0 of 3 (0%) have an AI response strategy ready

Analysis

ESS Tech Inc. currently manages 3 pending office actions within the Chemistry & Materials technology area. These actions are distributed among 3 distinct examiners, providing a variety of perspectives on the company's patent applications. Carlos Barcena is the busiest examiner for the portfolio, overseeing 1 pending office action. The prosecution is further localized within 1 distinct art unit.

For a practitioner, the distribution of actions across different examiners suggests that the portfolio is not dependent on a single individual's interpretation. The focus on the Chemistry & Materials technology area indicates a specialized technical direction. Because a distinct art unit is involved, the company may encounter consistent examination standards, which requires a coordinated prosecution approach.

Managing the distinct examiners requires a proactive approach to ensure that responses are aligned with the overall strategic goals of the company. Practitioners should analyze the allowance rates and prosecution timelines for each assigned examiner to better predict the outcomes for these pending matters. This approach helps in navigating the complexities of the materials patent landscape where examiner discretion can be significant. Maintaining a unified legal position across different examiners is essential for a strong intellectual property portfolio.

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

Portfolio Summary

3
Total Pending OAs
3
Non-Final OAs
0
Final Rejections
0
Advisory / Quayle

Case Difficulty Mix

Difficulty is derived from the rejection statutes on the most recent pending office action. §101-driven and multi-statute cases are graded Hard; §112-only and obviousness-type double-patenting cases are graded Easy; everything else is Medium. "Unknown" means we have not yet parsed a statute for that office action.

1
Hard (33%)
2
Medium (67%)
0
Easy (0%)
0
Unknown (0%)

Rejection Statute Mix

BucketCases
§103 only1 (33%)
§102 only1 (33%)
Multi-statute (no §101)1 (33%)

Industry Mix

How the docket's pending cases split across USPTO tech-center bands.

1
Life Sciences
33% of docket
0
Information Tech
0% of docket
0
Communications
0% of docket
0
Semiconductors
0% of docket
0
Mechanical / Eng
0% of docket
2
Business / Other
67% of docket

Time-on-OA Estimate

Manual office-action response work runs about 10 hours per case. The time-saved bands below show what IP Author's prosecution pipeline typically delivers — a conservative 20% on the low end, 35% in the middle, 50% on the high end.

30 h
Manual time on pending OAs
6 h
Time saved (low, 20%)
10 h
Time saved (mid, 35%)
0.3 wks
FTE-weeks freed (mid)

Top Examiners on this docket

ExaminerApps on this docketAllow rateInterview lift
BARCENA, CARLOS 1 80.5% +12.3%
BHATIA, ANSHU 1 84.2% +17.2%
SHEIKH, HAROON S 1 70.8% +18.3%

Quick Wins (1)

Cases in front of an examiner with an allow rate of 80%+ where the difficulty is Easy or Medium. The top 1 ordered by deadline are shown.

App #TitleExaminerDue in
18412269 NEGATIVE ELECTRODE SPACER FOR FLOW BATTERY BARCENA, CARLOS —

Hard Cases (1)

Multi-statute / §101-driven matters, or cases in front of an examiner with an allow rate under 30%. The top 1 ordered by deadline are shown.

App #TitleExaminerDue in
18409674 ELECTROMAGNETIC MIXING BHATIA, ANSHU —

Interview Candidates (3)

Cases in front of an examiner whose interview lift is 10 percentage points or more — i.e. interviewed cases historically resolve more favorably than non-interviewed ones. The top 3 ordered by deadline are shown.

App #TitleExaminerDue in
18412269 NEGATIVE ELECTRODE SPACER FOR FLOW BATTERY BARCENA, CARLOS —
18409674 ELECTROMAGNETIC MIXING BHATIA, ANSHU —
18480359 SYSTEMS AND METHODS FOR ELECTRODE ASSEMBLY FOR REDOX FLOW BATTERY SYSTEM SHEIKH, HAROON S —

Top Art Units

Art UnitApps
1751 1

Pending Office Actions

App #TitleExaminerArt UnitStatutesStatusDue inAIFiled
18412269 NEGATIVE ELECTRODE SPACER FOR FLOW BATTERY BARCENA, CARLOS — §102 Non-Final OA — Pending Jan 12, 2024
18409674 ELECTROMAGNETIC MIXING BHATIA, ANSHU — §102§103§112 Non-Final OA — Pending Jan 10, 2024
18480359 SYSTEMS AND METHODS FOR ELECTRODE ASSEMBLY FOR REDOX FLOW BATTERY SYSTEM SHEIKH, HAROON S 1751 §103 Non-Final OA — Pending Oct 03, 2023

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