% Expired Patents = 20.0

Forward Citations = 64

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3 inventors (with patents filed for the assignee):

Frank George Cooper (2 out of 8 patents)

David J Sorg (2 out of 2 patents)

Theodore J Krellner (1 out of 3 patents)

5 patents: Sort by Forward Citations

1. 6577139 - Impedance converter circuit (2003-06-10),

2. 6377110 - Low-cost temperature sensor providing relatively high accuracy, a wide dynamic range and high linearity (2002-04-23),

3. 6204748 - Yttrium chromite chromia thermistors (2001-03-20),

4. 6136231 - Yttrium chromite chromia thermistors (2000-10-24),

5. 5720556 - Temperature sensor probe (1998-02-24),

Company Overview

Keystone Thermometrics is a leading manufacturer of temperature sensing solutions for a wide range of industries including HVAC, automotive, and appliances. With over 40 years of experience, our products are known for their accuracy, reliability, and durability. We offer a variety of sensors, probes, and assemblies to meet the unique needs of our customers. Our team of experts is dedicated to providing top-quality products and exceptional customer service.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

5 Patents

#4 in St. Marys, PA

#1,868 in Pennsylvania

#51,570 in US

St. Marys, PA, United States of America

Keystone Thermometrics

Forward Citations = 64

3 inventors:

Frank George Cooper (2 out of 8 patents)

David J Sorg (2 out of 2 patents)

Theodore J Krellner (1 out of 3 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Keystone Thermometrics. Retrieved from https://idiyas.com/company/keystone-thermometrics

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]