Canrig Drilling Technology Ltd.
58 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.
Recorded as renamed to Nabors Drilling Technologies USA, Inc. (2022)
6
Ending by 2030
Dec 2026
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 Dec 25, 2026The maintenance fee for Oilfield Tubular Spin-In and Spin-Out Detection for Making-Up and Breaking-Out Tubular Strings (US 10,329,857) comes due Dec 25, 2026. Unpaid by Jun 25, 2027, it lapses early.
- 1 fee due Oct 7, 2027The maintenance fee for Internal closed loop cooling (US 10,615,666) comes due Oct 7, 2027. Unpaid by Apr 7, 2028, it lapses early.
Recent changes
- 1 term has ended 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 8,151,909 | Modular top drive lubrication system and methods In force · From the USPTO record | In force | From the USPTO record | |
| US 8,215,417 | Method, device and system for drilling rig modification In force · From the USPTO record | In force | From the USPTO record | |
| US 10,329,857 | Oilfield Tubular Spin-In and Spin-Out Detection for Making-Up and Breaking-Out Tubular Strings In force · High confidence | In force | High confidence | |
| US 8,567,529 | Permanent magnet direct drive top drive In force · From the USPTO record | In force | From the USPTO record | |
| US 9,022,358 | Two Speed Direct Drive Drawworks In force · Medium confidence | In force | Medium confidence | |
| US 8,672,059 | Permanent magnet direct drive drawworks In force · From the USPTO record | In force | From the USPTO record | |
| US 9,863,194 | System for manipulating tubulars for subterranean operations In force · From the USPTO record | In force | From the USPTO record | |
| US 9,379,655 | Method of field weakening control of permanent magnet motor drivers In force · From the USPTO record | In force | From the USPTO record | |
| US 9,722,522 | Method for controlling torque in permanent magnet motor drives In force · From the USPTO record | In force | From the USPTO record | |
| US 9,739,098 | Assembled Drilling Rig Moving Unit In force · High confidence | In force | High confidence |
Also on record, not counted in the 19: 58 patents in force now held by others · 10 lapsed for an unpaid fee · 8 ended at full term · 1 surrendered on reissue. 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 · 10 no status recorded