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For the Inventor, By the Inventor

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):

goldMedal William B Scobie (16 out of 20 patents)

silverMedal Henry R Killian (5 out of 7 patents)

bronzeMedal 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)


49 patents:

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.

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USPTO Data Jan 1 1976 - Dec 2 2025

49 Patents

#1 in Palm Springs, CA

#1,640 in California

#6,902 in US

#13,833 in the World

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Palm Springs, CA, United States of America

Keystone International

Forward Citations = 716

27 inventors:

goldMedal William B Scobie (16 out of 20 patents)

silverMedal Henry R Killian (5 out of 7 patents)

bronzeMedal 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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