Silverwell Technology Limited
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
0
Ending by 2030
Mar 2037
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 Jan 18, 2027The maintenance fee for Wellbore system having an annulus safety valve (US 11,702,913) comes due Jan 18, 2027. Unpaid by Jul 19, 2027, it lapses early.
- 1 fee due May 19, 2027The maintenance fee for Balanced valve assembly (US 10,480,284) comes due May 19, 2027. Unpaid by Nov 19, 2027, 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 10,480,284 | Balanced valve assembly In force · From the USPTO record | In force | From the USPTO record | |
| US 11,125,058 | Method of wellbore operations In force · From the USPTO record | In force | From the USPTO record | |
| US 11,519,248 | Selectively Injectable Tracer Flowmeter In force · High confidence | In force | High confidence | |
| US 11,459,862 | Well operation optimization In force · From the USPTO record | In force | From the USPTO record | |
| US 11,326,425 | Pressure protection system for lift gas injection In force · From the USPTO record | In force | From the USPTO record | |
| US 11,401,788 | System and method of well operations using a virtual plunger In force · From the USPTO record | In force | From the USPTO record | |
| US 11,441,401 | Hybrid gas lift system In force · From the USPTO record | In force | From the USPTO record | |
| US 12,428,934 | Selectively injectable chemical additive In force · From the USPTO record | In force | From the USPTO record | |
| US 11,702,913 | Wellbore system having an annulus safety valve In force · From the USPTO record | In force | From the USPTO record | |
| US 12,078,040 | Dual Direction Lift Gas Valve with Cavitation Prevention 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.
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.
2 pending