Patents per Year
Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 6640902 | Nested stack-down casing hanger system for subsea wellheads | Robert B. Baten, Harold Brian Skeels, David Campbell Macfarlane, Russell McBeth, Marcus Smedley | 2003-11-04 | $9,817,000 |
| 6513596 | Non-intrusive pressure measurement device for subsea well casing annuli | — | 2003-02-04 | $11,174,000 |
| 5107931 | Temporary abandonment cap and tool | William A. Valka | 1992-04-28 | |
| 4900041 | Subsea well casing hanger packoff system | Bob C. Hopkins, Don C. Underwood | 1990-02-13 | $3,486,000 |
| 4836288 | Casing hanger and packoff running tool | — | 1989-06-06 | $1,518,000 |
| 4836579 | Subsea casing hanger suspension system | Bob C. Hopkins, Don C. Underwood | 1989-06-06 | $1,518,000 |