Derry D. Sparlin

Follow

Person

Spring, TX, US

People

Patents Grantslast 30 patents

Information Patent Grant
Well screen having a uniform outer diameter
- Patent number 5,787,980
- Issue date Aug 4, 1998
- Nagaoka International Corporation
- Derry D. Sparlin
- E21 - EARTH DRILLING MINING
Information Patent Grant
Well screen having slurry flow paths
- Patent number 5,476,143
- Issue date Dec 19, 1995
- Nagaoka International Corporation
- Derry D. Sparlin
- E21 - EARTH DRILLING MINING
Information Patent Grant
Gravity enhanced maintenance screen
- Patent number 5,450,898
- Issue date Sep 19, 1995
- Derry D. Sparlin
- E21 - EARTH DRILLING MINING
Information Patent Grant
Permeable isolation sectioned screen
- Patent number 5,355,948
- Issue date Oct 18, 1994
- Derry D. Sparlin
- B09 - DISPOSAL OF SOLID WASTE RECLAMATION OF CONTAMINED SOIL SOIL
Information Patent Grant
Well liner with dual concentric half screens
- Patent number 5,355,949
- Issue date Oct 18, 1994
- Derry D. Sparlin
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method of manufacturing a selective isolation screen
- Patent number 5,307,984
- Issue date May 3, 1994
- Nagaoka International Corp.
- Tadayoshi Nagaoka
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method of manufacturing a selective isolation screen
- Patent number 5,246,158
- Issue date Sep 21, 1993
- Nagaoka International Corp.
- Tadayoshi Nagaoka
- E21 - EARTH DRILLING MINING