Inventor
Martin E. True
Inventor
Houston, TX, US
Overview
Patents· 7 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Bprimary
E21BEarth or rock drilling60%
Y10TTechnical subjects covered by former us classification20%
B08BCleaning in general10%
B23PMetal-working not otherwise provided for10%
PatentTitleYear
4,683,962'Spinner for use in connecting pipe joints'19874,630,688'Power spinner for rotating a kelly joint'19864,442,736'Power pipe tong rotary plunger inserter'19844,433,448'Power pipe thread cleaner'19844,125,040'Power tong apparatus'19784,042,033'Combination subsurface safety valve and chemical injector valve'19773,973,586'Velocity-tubing pressure actuated subsurface safety valve'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1977Patents assigned to EXXON PRODUCTION RESEARCH CO (2)· patent assignee history
1976–1987Based in Houston, TX, US· patent location history
1978–1986Patents assigned to WEATHERFORD LAMB (4)· patent assignee history
1987Patents assigned to TRUE MARTIN E (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| WEATHERFORD LAMB | 4 | 1978–1986 |
| EXXON PRODUCTION RESEARCH CO | 2 | 1976–1977 |
| TRUE MARTIN Eself | 1 | 1987 |
Locations
| Location | Patents | Span |
|---|---|---|
| Houston, Texas, US | 7 | 1976–1987 |