Inventor
Ernest P. Fisher, Jr.
Inventor
Carrollton, TX, US
Overview
Patents· 12 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Bprimary
E21BEarth or rock drilling63%
F16JPistons13%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests13%
Y10TTechnical subjects covered by former us classification13%
PatentTitleYear
4,630,833'Molded ring seal with end support rings'19864,489,743'Differential gas lift valve'19844,483,543'Seals'19844,436,152'Shifting tool'19844,432,416'Well flow control apparatus'19844,428,557'Single line deep depth safety valve'19844,381,822'Landing nipple'19834,378,839'Well tool'19834,362,211'Locking mandrel'19824,352,366'Velocity operated standing valve'19824,294,315'Landing nipple'19814,193,450'Surface controlled subsurface safety valve'1980Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1980–1986Patents assigned to OTIS ENG CO (12)· patent assignee history
1980–1986Based in Carrollton, TX, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| OTIS ENG CO | 12 | 1980–1986 |
Locations
| Location | Patents | Span |
|---|---|---|
| Carrollton, Texas, US | 12 | 1980–1986 |