Douglas G. Calvin

Person

Missouri City, TX, US

People

Patents Grantslast 30 patents

Information Patent Grant
Rotary valve with pressure energized seal
- Patent number 5,934,645
- Issue date Aug 10, 1999
- Tyco Flow Control, Inc.
- Douglas G. Calvin
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Rotary valve with pressurized energized seal
- Patent number 5,765,815
- Issue date Jun 16, 1998
- Keystone International Holdings Corp.
- Douglas G. Calvin
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Fugitive emission sealing assembly
- Patent number 5,244,183
- Issue date Sep 14, 1993
- Keystone International Holdings Corp.
- Douglas G. Calvin
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Corrosion-resistant overlay for the edge of butterfly valves
- Patent number 4,899,775
- Issue date Feb 13, 1990
- Keystone International Holdings Corp.
- Douglas G. Calvin
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Methods and apparatus for adjusting a valve closure member
- Patent number 4,846,441
- Issue date Jul 11, 1989
- Keystone International, Inc.
- William B. Scobie
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Corrosion-resistant overlay for the edge of butterfly valves
- Patent number 4,773,625
- Issue date Sep 27, 1988
- Keystone International, Inc.
- Douglas G. Calvin
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Manual override drive apparatus
- Patent number 4,317,384
- Issue date Mar 2, 1982
- Tapco International, Inc.
- Douglas G. Calvin
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Steam manifold distribution system for providing equal quality of s...
- Patent number 4,269,211
- Issue date May 26, 1981
- Texaco Inc.
- Curtis E. Howard
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method for forming an automatic burner for in situ combustion for e...
- Patent number 4,205,725
- Issue date Jun 3, 1980
- Texaco Inc.
- Curtis E. Howard
- E21 - EARTH DRILLING MINING
Information Patent Grant
Ignition system for an automatic burner for in situ combustion for...
- Patent number 4,137,968
- Issue date Feb 6, 1979
- Texaco Inc.
- Curtis E. Howard
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method for automatically initiating in situ combustion for enhanced...
- Patent number 4,136,737
- Issue date Jan 30, 1979
- Texaco Inc.
- Curtis E. Howard
- E21 - EARTH DRILLING MINING
Information Patent Grant
Well steam sampler apparatus and method of forming and using a well...
- Patent number 4,088,187
- Issue date May 9, 1978
- Texaco Inc.
- Curtis E. Howard
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method for in situ combustion for enhanced thermal recovery of hydr...
- Patent number 4,079,784
- Issue date Mar 21, 1978
- Texaco Inc.
- Curtis E. Howard
- E21 - EARTH DRILLING MINING
Information Patent Grant
Methods and steam samplers with inertial latch
- Patent number 3,981,189
- Issue date Sep 21, 1976
- Texaco Inc.
- Curtis E. Howard
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method and steam samplers
- Patent number 3,934,469
- Issue date Jan 27, 1976
- Texaco Inc.
- Curtis E. Howard
- E21 - EARTH DRILLING MINING

Douglas G. Calvin

Person

Patents Grantslast 30 patents

Rotary valve with pressure energized seal

Rotary valve with pressurized energized seal

Fugitive emission sealing assembly

Corrosion-resistant overlay for the edge of butterfly valves

Methods and apparatus for adjusting a valve closure member

Corrosion-resistant overlay for the edge of butterfly valves

Manual override drive apparatus

Steam manifold distribution system for providing equal quality of s...

Method for forming an automatic burner for in situ combustion for e...

Ignition system for an automatic burner for in situ combustion for...

Method for automatically initiating in situ combustion for enhanced...

Well steam sampler apparatus and method of forming and using a well...

Method for in situ combustion for enhanced thermal recovery of hydr...

Methods and steam samplers with inertial latch

Method and steam samplers