Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5092406 | Apparatus for controlling well cementing operation | — | 1992-03-03 |
| 4673652 | Method of testing and reconditioning insulating tubular conduits | David V. Chenoweth, David M. Anderson | 1987-06-16 |
| 4624485 | Insulating tubular conduit apparatus | David V. Chenoweth | 1986-11-25 |
| 4582349 | Plastically deformed seals in downhole tools | David V. Chenoweth, Everett H. Smith | 1986-04-15 |
| 4566495 | Concentric walled conduit for a tubular conduit string | John R. Baker, David V. Chenoweth | 1986-01-28 |
| RE31978 | Well tool having knitted wire mesh seal means and method of use thereof | — | 1985-09-03 |
| 4509599 | Gas well liquid removal system and process | David V. Chenoweth | 1985-04-09 |
| 4480371 | Method of making insulated tubular conduit | David V. Chenoweth | 1984-11-06 |
| 4457379 | Method and apparatus for opening downhole flapper valves | — | 1984-07-03 |
| 4444420 | Insulating tubular conduit apparatus | David V. Chenoweth | 1984-04-24 |
| 4421174 | Cyclic annulus pressure controlled oil well flow valve and method | Neil H. Akkerman | 1983-12-20 |
| 4411435 | Seal assembly with energizing mechanism | — | 1983-10-25 |
| 4396211 | Insulating tubular conduit apparatus and method | David V. Chenoweth | 1983-08-02 |
| 4326585 | Method and apparatus for treating well components with a corrosion inhibiting fluid | — | 1982-04-27 |
| 4326588 | Well tool having knitted wire mesh seal means and method of use thereof | — | 1982-04-27 |
| 4270606 | Apparatus for selective disengagement of a fluid transmission conduit and for control of fluid transmission from a well zone | William M. Roberts | 1981-06-02 |
| 4210207 | Valve apparatus | William M. Roberts | 1980-07-01 |