Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9255463 | Flapper equalizer with integral spring | Steve Rosenblatt | 2016-02-09 |
| 8534361 | Multi-stage pressure equalization valve assembly for subterranean valves | Kevin R. Plunkett | 2013-09-17 |
| 5918858 | Undulating transverse interface for curved flapper seal | Michael S. Rawson, Doug Trott, Clifford H. Beall | 1999-07-06 |
| 5682921 | Undulating transverse interface for curved flapper seal | Michael S. Rawson, Doug Trott, Clifford H. Beall | 1997-11-04 |