Issued Patents All Time
Showing 1–25 of 25 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9359863 | Downhole plug apparatus | Steven G. Streich, Donnie G. Loveday, Donny Winslow, Earl Webb | 2016-06-07 |
| 6896061 | Multiple zones frac tool | Iosif Hriscu, Don S. Folds, Gregory W. Vargus, Thomas W. Hawkins | 2005-05-24 |
| 5400855 | Casing inflation packer | Lee W. Stepp, Eugene E. Baker, Richard L. Giroux | 1995-03-28 |
| 5364110 | Downhole tool metal-to-metal seal | Steven G. Streich, David D. Szarka, Bobby L. Sullaway | 1994-11-15 |
| 5348089 | Method and apparatus for the multiple stage cementing of a casing string in a well | Alan B. Duell, Lee W. Stepp | 1994-09-20 |
| 5314015 | Stage cementer and inflation packer apparatus | Steven G. Streich, Richard L. Giroux, Lee W. Stepp | 1994-05-24 |
| 5299640 | Knife gate valve stage cementer | Steven G. Streich, Charles F. VanBerg, Jr. | 1994-04-05 |
| 5279370 | Mechanical cementing packer collar | Alan B. Duell | 1994-01-18 |
| 5178216 | Wedge lock ring | Richard L. Giroux | 1993-01-12 |
| 5117910 | Packer for use in, and method of, cementing a tubing string in a well without drillout | T. Austin Freeman | 1992-06-02 |
| 5038862 | External sleeve cementing tool | Richard L. Giroux | 1991-08-13 |
| 4991654 | Casing valve | David D. Szarka, Bob L. Sullaway | 1991-02-12 |
| 4961465 | Casing packer shoe | — | 1990-10-09 |
| 4949788 | Well completions using casing valves | David D. Szarka, Bob L. Sullaway, Steven L. Schwegman | 1990-08-21 |
| 4880059 | Sliding sleeve casing tool | Richard L. Giroux | 1989-11-14 |
| 4484633 | Safety joint | — | 1984-11-27 |
| 4458752 | Downhole tool inflatable packer assembly | — | 1984-07-10 |
| 4457367 | Downhole pump and testing apparatus | — | 1984-07-03 |
| 4412584 | Downhole tool intake port assembly | — | 1983-11-01 |
| 4388968 | Downhole tool suction screen assembly | — | 1983-06-21 |
| 4386655 | Downhole pump with floating seal means | — | 1983-06-07 |
| 4372387 | Downhole tool with ratchet | — | 1983-02-08 |
| 4366862 | Downhole pump and testing apparatus | — | 1983-01-04 |
| 4313495 | Downhole pump with pressure limiter | — | 1982-02-02 |
| 4246964 | Down hole pump and testing apparatus | — | 1981-01-27 |