South Williamsport, PA, United States of America

Keystone Friction Hinge Co.

Calculating rank

USPTO Granted Patents = 2

% Expired Patents = 50.0

Forward Citations = 48

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4 inventors (with patents filed for the assignee):

Adam Kistner (1 out of 1 patent)

James Alexander Witter (1 out of 1 patent)

Edward J Hannan (1 out of 1 patent)

4. George H Schneider (1 out of 5 patents)

2 patents: Sort by Forward Citations

1. 7275283 - Appliance hinge (2007-10-02),

2. 5341542 - Anti-tip hinge device and method (1994-08-30),

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USPTO Data Jan 1 1976 - Oct 27 2026

2 Patents

#2 in South Williamsport, PA

#3,432 in Pennsylvania

#94,953 in US

South Williamsport, PA, United States of America

Keystone Friction Hinge Co.

Forward Citations = 48

4 inventors:

Adam Kistner (1 out of 1 patent)

James Alexander Witter (1 out of 1 patent)

Edward J Hannan (1 out of 1 patent)

4. George H Schneider (1 out of 5 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Keystone Friction Hinge Co.. Retrieved from https://idiyas.com/company/keystone-friction-hinge-company

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]