Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8297590 | Guided non-ported expanding gate valve and method | Frank J. Arriens | 2012-10-30 |
| 5090661 | Gate valve | Glenn C. Parks, Jr., C. Mack Ellison, John Beson | 1992-02-25 |
| 4972904 | Geothermal well chemical injection system | — | 1990-11-27 |
| 4372563 | Packing support for mounting a well casing packing | Robert J. Diehl, Frederic D. Wells, Jr. | 1983-02-08 |
| 4328013 | Baffle plate for steam separator | Frederic D. Wells, Jr. | 1982-05-04 |
| 4263025 | Baffle plate for cyclone steam separator | — | 1981-04-21 |
| 4225325 | Steam separator with variably sized rectangular inlet opening | Robert J. Diehl | 1980-09-30 |
| 4184504 | Wellhead valve removal and installation tool | James T. Carmichael, Robert J. Diehl | 1980-01-22 |