Citadel Drilling Ltd.
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
0
Ending by 2030
Dec 2040
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 16, 2026The maintenance fee for Choke controller, system, and method using adaptive proportional gain to control choke based on pressure setpoint (US 11,649,837) comes due Nov 16, 2026. Unpaid by May 17, 2027, it lapses early.
- 1 fee due Dec 20, 2026The maintenance fee for Managed pressure drilling manifold and methods (US 11,680,453) comes due Dec 20, 2026. Unpaid by Jun 21, 2027, it lapses early.
- 1 fee due Jul 30, 2027The maintenance fee for Internet of Things in Managed Pressure Drilling Operations (US 11,885,213) comes due Jul 30, 2027. Unpaid by Jan 31, 2028, it lapses early.
Recent changes
- 1 of the patents on this record was granted since Aug 17, 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 12,352,119 | Managed pressure drilling manifold and methods In force · From the USPTO record | In force | From the USPTO record | |
| US 12,091,934 | Pressure Management Device for Drilling System In force · High confidence | In force | High confidence | |
| US 12,612,840 | Pressure Management Device for Drilling System In force · Medium confidence | In force | Medium confidence | |
| US 11,680,453 | Managed pressure drilling manifold and methods In force · From the USPTO record | In force | From the USPTO record | |
| US 12,305,456 | Monobore Drilling Methods with Managed Pressure Drilling In force · Medium confidence | In force | Medium confidence | |
| US 12,173,733 | Choke controller, system, and method using adaptive proportional gain to control choke based on pressure setpoint In force · From the USPTO record | In force | From the USPTO record | |
| US 11,649,837 | Choke controller, system, and method using adaptive proportional gain to control choke based on pressure setpoint In force · From the USPTO record | In force | From the USPTO record | |
| US 11,885,213 | Internet of Things in Managed Pressure Drilling Operations In force · High confidence | In force | High confidence | |
| US 12,320,246 | Internet of Things in Managed Pressure Drilling Operations In force · High confidence | In force | High confidence | |
| US 12,768,239 | Rotating Control Device In force · High confidence | In force | High confidence |
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.