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Houston, TX, United States of America

Keystone International Holdings Corp.

USPTO Granted Patents = 48

Trademarks = 8

Forward Citations = 630

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31 inventors (with patents filed for the assignee):

Michael D McNeely (10 out of 18 patents)

Alan F Chou (5 out of 10 patents)

Thomas F Higgins (4 out of 5 patents)

4. William B Scobie (4 out of 20 patents)

5. Jack B Alberts (4 out of 7 patents)

6. Robert A Frenzel (4 out of 6 patents)

7. Marvin E Beasley (3 out of 8 patents)

8. Daniel P Kusmer (3 out of 7 patents)

9. Horace J Maxwell (3 out of 3 patents)

10. Douglas G Calvin (3 out of 15 patents)

11. Max Kueffer (3 out of 3 patents)

12. Roy L Feiss (3 out of 4 patents)

13. George J Loos (3 out of 4 patents)

14. Joel David Bell (2 out of 12 patents)

15. Paul A Yohner (2 out of 5 patents)

48 patents: Sort by Forward Citations

1. 5823228 - Valve manifold (1998-10-20),

2. D398375 - Manifold (1998-09-15),

3. 5803123 - Mounting system for pressure transmitters (1998-09-08),

4. 5769113 - Dual pilot manifold assembly for a safety relief valve (1998-06-23),

5. 5765815 - Rotary valve with pressurized energized seal (1998-06-16),

6. 5590684 - Dual pilot manifold assembly for a safety relief valve (1997-01-07),

7. 5579800 - Rotary valve position indicator and method (1996-12-03),

8. 5549131 - Automatic recirculation valve (1996-08-27),

9. 5518028 - Adjustable magnet carrier for a valve position indicator (1996-05-21),

10. 5494071 - Mounting system for pressure transmitters (1996-02-27),

11. 5469805 - High visibility valve position indicator (1995-11-28),

12. 5439619 - Steam conditioning butterfly valve (1995-08-08),

13. 5427354 - Valve assembly (1995-06-27),

14. 5400819 - Measuring and regulating valve (1995-03-28),

15. 5388806 - Valve assembly having improved valve seat (1995-02-14),

Keystone International Holdings Corp. is a global investment holding company that specializes in various sectors including technology, finance, energy, and real estate. With a diverse portfolio of companies and strategic investments, Keystone International aims to create long-term value by partnering with innovative and successful businesses. Through its subsidiaries and affiliates, the company actively seeks growth opportunities and engages in strategic investments worldwide.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

48 Patents

#114 in Houston, TX

#389 in Texas

#7,024 in US

#14,104 in the World

Houston, TX, United States of America

Keystone International Holdings Corp.

Forward Citations = 630

31 inventors:

Michael D McNeely (10 out of 18 patents)

Alan F Chou (5 out of 10 patents)

Thomas F Higgins (4 out of 5 patents)

4. William B Scobie (4 out of 20 patents)

5. Jack B Alberts (4 out of 7 patents)

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