William R Michalson (1 out of 9 patents)
Bruce S Lavoie (1 out of 1 patent)
Company Badge
USPTO Data Jan 1 1976 - Nov 10 2026
1 Patents
#19 in Northborough, MA
#6,622 in Massachusetts
#137,142 in US
Keyhold Engineering, Inc.
Forward Citations = 69
2 inventors:
Northborough, MA, United States of America
Keyhold Engineering, Inc.
Calculating rank
% Expired Patents = 100.0
Forward Citations = 69
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2 inventors (with patents filed for the assignee):
1 patent:
IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Keyhold Engineering, Inc.. Retrieved from https://idiyas.com/company/keyhold-engineering
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]