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For the Inventor, By the Inventor

Houston, TX, United States of America

Gray Tool Company


USPTO Granted Patents = 23

Forward Citations = 283

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16 inventors (with patents filed for the assignee):

goldMedal Michael A Karr, Jr (6 out of 12 patents)

silverMedal Charles D Bridges (5 out of 38 patents)

bronzeMedal Frank C Adamek (4 out of 20 patents)

4.  John K McGee (3 out of 20 patents)

5.  Robert E Bush (2 out of 4 patents)

6.  Charles Hays (2 out of 3 patents)

7.  James R Dickson (1 out of 14 patents)

8.  Charles Edward Jennings (1 out of 61 patents)

9.  John M Zwiegel (1 out of 2 patents)

10.  Boyd D Boitnott (1 out of 1 patent)

11.  James Vaull Bonds (1 out of 5 patents)

12.  Neil Karlskind (1 out of 1 patent)

13.  Warren D King (1 out of 1 patent)

14.  Vernon G Stewart (1 out of 1 patent)

15.  John P Mitcham (1 out of 1 patent)


23 patents:

1. 4643390 - Fail-safe valve actuator (1987-02-17),
2. 4627958 - Densification of metal powder to produce cladding of valve interiors by (1986-12-09),
3. 4612983 - Shear type gate valve (1986-09-23),
4. 4570724 - Stepwise rotary actuator (1986-02-18),
5. 4570659 - Fire resistant valve (1986-02-18),
6. 4569503 - Valve with remote and manual actuation means (1986-02-11),
7. 4562090 - Method for improving the density, strength and bonding of coatings (1985-12-31),
8. 4556076 - Fire resistant valve (1985-12-03),
9. 4553589 - Fire-safe surface-controlled subsurface safety valve control (1985-11-19),
10. 4552369 - Stem sealing for high pressure valve (1985-11-12),
11. 4540012 - Temperature sensitive valve bonnet assembly (1985-09-10),
12. 4534235 - Rotary stepper actuator (1985-08-13),
13. 4511002 - Multiple tubing hanger tie back system and method (1985-04-16),
14. 4483545 - Fire resistant connections and double ribbed sealing means therefor (1984-11-20),
15. 4477093 - Fire resistant connections and T-like sealing means therefor (1984-10-16),
Company Overview
Gray Tool Company, headquartered in Houston, Texas, specializes in the design and manufacturing of high-quality industrial tools and equipment. The company is recognized for its expertise in producing precision tools for various sectors, including aerospace, automotive, and energy. With a commitment to innovation, Gray Tool focuses on developing advanced solutions that enhance operational efficiency and safety in demanding environments. Their extensive product offerings cater to a diverse clientele, reflecting a strong dedication to quality and performance.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

23 Patents

#233 in Houston, TX

#850 in Texas

#14,428 in US

#27,685 in the World

Houston, TX (US)
Houston, TX, United States of America

Gray Tool Company

Forward Citations = 283

16 inventors:

goldMedal Michael A Karr, Jr (6 out of 12 patents)

silverMedal Charles D Bridges (5 out of 38 patents)

bronzeMedal Frank C Adamek (4 out of 20 patents)

4.  John K McGee (3 out of 20 patents)

5.  Robert E Bush (2 out of 4 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Gray Tool Company. Retrieved from https://idiyas.com/company/gray-tool-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]
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