Inventor
Grant L. Hartman
Inventor
Walters, OK, US
Overview
Patents· 4 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Bprimary
E21BEarth or rock drilling80%
F04BPositive-displacement machines for liquids20%
PatentTitleYear
10,260,500Downhole dynamometer and method of operation20199,869,157'Reverse circulation cementing system for cementing a liner'20186,622,798'Method and apparatus for maintaining a fluid column in a wellbore annulus'20035,829,526'Method and apparatus for placing and cementing casing in horizontal wells'1998Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1998–2003Patents assigned to HALLIBURTON ENERGY SERV INC (2)· patent assignee history
1998–2003Based in Walters, OK, US· patent location history
2018Patents assigned to HALLIBURTON ENERGY SERVICES INC (1)· patent assignee history
2018Based in Lawton, OK, US· patent location history
2019Patents assigned to GEN ELECTRIC (1)· patent assignee history
2019Based in Oklahoma City, OK, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HALLIBURTON ENERGY SERV INC | 2 | 1998–2003 |
| GEN ELECTRIC | 1 | 2019 |
| HALLIBURTON ENERGY SERVICES INC | 1 | 2018 |
Locations
| Location | Patents | Span |
|---|---|---|
| Walters, OK, US | 2 | 1998–2003 |
| Oklahoma City, OK, US | 1 | 2019 |
| Lawton, OK, US | 1 | 2018 |