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Missouri City, TX, United States of America

Douglas G Calvin

USPTO Granted Patents = 15

Average Co-Inventor Count = 1.7

ph-index = 8

Forward Citations = 141(Granted Patents)

Location History:

Houston, TX (US) (1976 - 1980)
Missouri City, TX (US) (1978 - 1999)

Company Filing History:

Keystone International Holdings Corp.

Keystone International

Tyco Flow Control, Inc.

5. 1 out of 161

Tapco International Corporation

Years Active: 1976-1999

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15 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5934645 - Rotary valve with pressure energized seal (1999-08-10),

2. 5765815 - Rotary valve with pressurized energized seal (1998-06-16),

3. 5244183 - Fugitive emission sealing assembly (1993-09-14),

4. 4899775 - Corrosion-resistant overlay for the edge of butterfly valves (1990-02-13),

5. 4846441 - Methods and apparatus for adjusting a valve closure member (1989-07-11),

6. 4773625 - Corrosion-resistant overlay for the edge of butterfly valves (1988-09-27),

7. 4317384 - Manual override drive apparatus (1982-03-02),

8. 4269211 - Steam manifold distribution system for providing equal quality of steam (1981-05-26),

9. 4205725 - Method for forming an automatic burner for in situ combustion for (1980-06-03),

10. 4137968 - Ignition system for an automatic burner for in situ combustion for (1979-02-06),

11. 4136737 - Method for automatically initiating in situ combustion for enhanced (1979-01-30),

12. 4088187 - Well steam sampler apparatus and method of forming and using a well (1978-05-09),

13. 4079784 - Method for in situ combustion for enhanced thermal recovery of (1978-03-21),

14. 3981189 - Methods and steam samplers with inertial latch (1976-09-21),

15. 3934469 - Method and steam samplers (1976-01-27),

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