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Palm Springs, CA, United States of America

Keystone International

USPTO Granted Patents = 49

Trademarks = 2

Forward Citations = 716

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27 inventors (with patents filed for the assignee):

William B Scobie (16 out of 20 patents)

Henry R Killian (5 out of 7 patents)

Edward G Holtgraver (4 out of 9 patents)

4. Michael L Wagberg (4 out of 4 patents)

5. Walter W Powell (3 out of 16 patents)

6. Paul A Yohner (3 out of 5 patents)

7. Larry A Sample (3 out of 5 patents)

8. Joe L Aldrich (3 out of 3 patents)

9. Petrus J Schils (3 out of 3 patents)

10. Cleo M Bickford (3 out of 4 patents)

11. Douglas G Calvin (2 out of 15 patents)

12. Walter T Roush (2 out of 4 patents)

13. Daniel P Kusmer (2 out of 2 patents)

14. William Stahley (1 out of 1 patent)

15. Richard Bryan Lee (1 out of 5 patents)

Core Competencies:

High-Speed Image Transfer

Bellows Sealed Rotary Valve

Valve Seat Tool

High Temperature Safety Relief

Check Valve

Bleed Valve Assembly

Butterfly Valve Construction

Fireproof Valve Assembly

Declutchable Valve Override

Material Level Detector

Rotatable Shaft Assembly

Valve Actuator

49 patents: Sort by Forward Citations

1. 6771821 - High-speed image transfer system (2004-08-03),

2. 5090658 - Bellows sealed rotary valve and seal assembly (1992-02-25),

3. 5042151 - Method for removing and inserting valve seats (1991-08-27),

4. 4982483 - Valve seat tool for removing and inserting value seats (1991-01-08),

5. 4964432 - Method and means for mounting valve member on valve stem (1990-10-23),

6. 4898201 - Portabl tool for cleaning valve bores and associated inlet passage (1990-02-06),

7. 4870989 - High temperature safety relief system (1989-10-03),

8. 4865074 - High temperature safety relief system (1989-09-12),

9. 4862910 - Check valve with disc centering device (1989-09-05),

10. 4848397 - High temperature safety relief system (1989-07-18),

11. 4846441 - Methods and apparatus for adjusting a valve closure member (1989-07-11),

12. 4846225 - Transmission assembly for use with double block and bleed system (1989-07-11),

13. 4846212 - Bleed valve assembly for double block and bleed system (1989-07-11),

14. 4828221 - Valve assembly (1989-05-09),

15. 4817213 - Method for forming a torus and a piston made therefrom for use in a (1989-04-04),

Keystone International is a global manufacturing company specializing in advanced engineering products and solutions. With over 50 years of experience, Keystone International remains at the forefront of innovation in various industries including aerospace, automotive, and energy. Our dedicated team of experts is committed to delivering high-quality and reliable products that meet the specific needs of our clients worldwide.

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

Company Badge

USPTO Data Jan 1 1976 - Jan 13 2026

49 Patents

#1 in Palm Springs, CA

#1,642 in California

#6,924 in US

#13,901 in the World

Palm Springs, CA, United States of America

Keystone International

Forward Citations = 716

27 inventors:

William B Scobie (16 out of 20 patents)

Henry R Killian (5 out of 7 patents)

Edward G Holtgraver (4 out of 9 patents)

4. Michael L Wagberg (4 out of 4 patents)

5. Walter W Powell (3 out of 16 patents)

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