Mhwirth As
9 more in force are now held by other companies
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
4
Ending by 2030
Jan 2027
Next term end
When these terms end
Held patents by the year their term ends
20262027202820292030203120322033203420352036203720382039204020412042204320442045
Fee deadlines
Maintenance fees fall due 3.5, 7.5 and 11.5 years after grant. A missed fee ends a patent at the end of the six month grace period that follows, not on the due date.
- 1 fee due Nov 21, 2026The maintenance fee for Self-aligning apparatus (US 10,294,735) comes due Nov 21, 2026. Unpaid by May 21, 2027, it lapses early.
- 2 fees due Jan 14 to 16, 2027 · next Jan 14
- 3 fees due Feb 15 to 20, 2027 · next Feb 15
- 1 fee due Mar 22, 2027The maintenance fee for Compensator (US 9,140,079) comes due Mar 22, 2027. Unpaid by Sep 22, 2027, it lapses early.
- 2 fees due Apr 20 to 27, 2027 · next Apr 20
- 2 fees due May 14 to 26, 2027 · next May 14
- 3 fees due Jun 3 to 26, 2027 · next Jun 3
- 1 fee due Jul 7, 2027The maintenance fee for Top drive for a drilling rig (US 10,526,844) comes due Jul 7, 2027. Unpaid by Jan 7, 2028, it lapses early.
- 4 fees due Oct 5 to 28, 2027 · next Oct 5
Recent changes
- 2 of the patents on this record were granted since Aug 16, 2026
Patents held now
Soonest term end first. Each date below is computed on that patent's own page, which shows the rule, the adjustments and the fee history it was derived from.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,743,853 | Top drive drilling apparatus In force · From the USPTO record | In force | From the USPTO record | |
| US 7,931,077 | Top drive drilling apparatus In force · From the USPTO record | In force | From the USPTO record | |
| US 8,186,977 | Pumping system In force · From the USPTO record | In force | From the USPTO record | |
| US 8,397,837 | Anti-collision system In force · From the USPTO record | In force | From the USPTO record | |
| US 8,733,452 | Riser Section Connector with Flanges and External Locking Ring In force · High confidence | In force | High confidence | |
| US 8,939,048 | Device and method for rotation of torque tong In force · From the USPTO record | In force | From the USPTO record | |
| US 9,169,701 | Restraining device for a tensioner assembly In force · From the USPTO record | In force | From the USPTO record | |
| US 9,163,466 | Fluid diverter system for a drilling facility In force · From the USPTO record | In force | From the USPTO record | |
| US 9,080,309 | Device for removing sea bed In force · From the USPTO record | In force | From the USPTO record | |
| US 9,309,727 | Mousehole apparatus In force · From the USPTO record | In force | From the USPTO record |
Also on record, not counted in the 56: 9 patents in force now held by others · 7 lapsed for an unpaid fee · 5 ended at full term. List them
Sources and methods
Compiled from the USPTO record, grants, published applications and recorded assignments, not yet reviewed by hand.
How this record was built
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.
Published applications
US patent applications published under this name that have not become patents. An application is published about eighteen months after its earliest filing; one that has not been published is in no public record.
1 abandoned · 18 no status recorded