Inventor
Warren E. Holland
Inventor
Houston, TX, US
Overview
Patents· 5 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Bprimary
E21BEarth or rock drilling50%
F16JPistons13%
G01MTesting static or dynamic balance of machines or structures13%
G01SRadio direction-finding13%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests13%
PatentTitleYear
4,360,064'Circulating valve for wells'19824,204,690'Sealing retaining ring assembly'19804,132,270'Method for protection of well equipment from particles of debris'19794,042,033'Combination subsurface safety valve and chemical injector valve'19774,001,764'Acoustic method for detecting leaks from submerged pipelines'1977Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1977–1982Patents assigned to EXXON PRODUCTION RESEARCH CO (5)· patent assignee history
1977–1980Based in Houston, TX, US· patent location history
1982Based in Harris County, TX, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| EXXON PRODUCTION RESEARCH CO | 5 | 1977–1982 |
Locations
| Location | Patents | Span |
|---|---|---|
| Houston, Texas, US | 4 | 1977–1980 |
| Harris County, Texas, US | 1 | 1982 |