Donald D. Drummond

Follow

Person

Jasper, AL, US

People

Patents Grantslast 30 patents

Information Patent Grant
Drill bit and drill assembly
- Patent number 4,805,709
- Issue date Feb 21, 1989
- Drumco
- Walter F. Johnsey
- E21 - EARTH DRILLING MINING
Information Patent Grant
Drill bit assembly
- Patent number 4,541,494
- Issue date Sep 17, 1985
- Drumco
- Donald D. Drummond
- E21 - EARTH DRILLING MINING
Information Patent Grant
Drill bit assembly having improved operational life
- Patent number 4,540,055
- Issue date Sep 10, 1985
- Drumco
- Donald D. Drummond
- E21 - EARTH DRILLING MINING
Information Patent Grant
Drill bit assembly with fluid separator
- Patent number 4,515,229
- Issue date May 7, 1985
- Donald D. Drummond
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method and apparatus for lubricating a drill bit
- Patent number 4,508,183
- Issue date Apr 2, 1985
- Drumco
- Donald D. Drummond
- E21 - EARTH DRILLING MINING