John L Margrave (4 out of 24 patents)
James W Campbell (4 out of 4 patents)
Company Badge
USPTO Data Jan 1 1976 - Oct 6 2026
4 Patents
#999 in Houston, TX
#3,931 in Texas
#60,597 in US
Efh, Inc.
Forward Citations = 40
2 inventors:
Houston, TX, United States of America
Efh, Inc.
Forward Citations = 40
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2 inventors (with patents filed for the assignee):
4 patents:
Company Overview
EFH, Inc. is a leading provider of innovative solutions in the fields of engineering, construction, and project management. With over 20 years of experience, we have established a strong reputation for delivering high-quality services to our clients. Our team of experts is dedicated to ensuring the success of every project, from start to finish. Visit our website to learn more about our capabilities and how we can help you achieve your goals.
Profile summary synthesized from public USPTO records and patent filings.
IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Efh, Inc.. Retrieved from https://idiyas.com/company/efh
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]
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]
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]