% Expired Patents = 25.0

Forward Citations = 305

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8 inventors (with patents filed for the assignee):

Richard W Hoffman (2 out of 2 patents)

Victor George Weizer (1 out of 4 patents)

David M Wilt (1 out of 9 patents)

4. Samar Sinharoy (1 out of 2 patents)

5. Martin O Patton (1 out of 4 patents)

6. Phillip P Jenkins (1 out of 1 patent)

7. Basab Chatterjee (1 out of 1 patent)

8. Steven A Ringel (1 out of 1 patent)

4 patents: Sort by Forward Citations

1. 6660928 - Multi-junction photovoltaic cell (2003-12-09),

2. 6482672 - Using a critical composition grading technique to deposit InGaAs epitaxial layers on InP substrates (2002-11-19),

3. 6034321 - Dot-junction photovoltaic cells using high-absorption semiconductors (2000-03-07),

4. 5571339 - Hydrogen passivated heteroepitaxial III-V photovoltaic devices grown on (1996-11-05),

Company Overview

Essential Research, Inc. is a leading market research firm specializing in providing in-depth insights and analysis for businesses across various industries. With a team of experienced researchers and analysts, we deliver high-quality research solutions to help our clients make informed decisions and drive business growth. Our services include market research, customer satisfaction surveys, competitive analysis, and more.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

4 Patents

#279 in Cleveland, OH

#2,334 in Ohio

#60,641 in US

Cleveland, OH, United States of America

Essential Research, Inc.

Forward Citations = 305

8 inventors:

Richard W Hoffman (2 out of 2 patents)

Victor George Weizer (1 out of 4 patents)

David M Wilt (1 out of 9 patents)

4. Samar Sinharoy (1 out of 2 patents)

5. Martin O Patton (1 out of 4 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Essential Research, Inc.. Retrieved from https://idiyas.com/company/essential-research

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]