Sturman Digital Systems, LLC
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
3
Ending by 2030
Feb 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 Jan 16, 2027The maintenance fee for Liquid and gaseous multi-fuel compression ignition engines (US 10,352,228) comes due Jan 16, 2027. Unpaid by Jul 16, 2027, it lapses early.
- 1 fee due May 10, 2027The maintenance fee for Methods of operation of fuel injectors with intensified fuel storage (US 9,181,890) comes due May 10, 2027. Unpaid by Nov 10, 2027, it lapses early.
- 1 fee due Jun 8, 2027The maintenance fee for Free piston engines with single hydraulic piston actuator and methods (US 9,206,738) comes due Jun 8, 2027. Unpaid by Dec 8, 2027, it lapses early.
- 1 fee due Aug 18, 2027The maintenance fee for Variable compression ratio engines and methods for HCCI compression ignition operation (US 10,563,573) comes due Aug 18, 2027. Unpaid by Feb 18, 2028, it lapses early.
Recent changes
- 1 term has ended 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 7,958,909 | Spool valve In force · From the USPTO record | In force | From the USPTO record | |
| US 7,694,891 | Fuel injector with boosted needle closure In force · From the USPTO record | In force | From the USPTO record | |
| US 8,733,671 | Fuel injectors with intensified fuel storage and methods of operating an engine therewith In force · From the USPTO record | In force | From the USPTO record | |
| US 8,596,230 | Hydraulic internal combustion engines In force · From the USPTO record | In force | From the USPTO record | |
| US 9,206,738 | Free piston engines with single hydraulic piston actuator and methods In force · From the USPTO record | In force | From the USPTO record | |
| US 9,464,569 | Digital hydraulic opposed free piston engines and methods In force · From the USPTO record | In force | From the USPTO record | |
| US 8,887,690 | Ammonia fueled mobile and stationary systems and methods In force · From the USPTO record | In force | From the USPTO record | |
| US 9,181,890 | Methods of operation of fuel injectors with intensified fuel storage In force · From the USPTO record | In force | From the USPTO record | |
| US 10,563,573 | Variable compression ratio engines and methods for HCCI compression ignition operation In force · From the USPTO record | In force | From the USPTO record | |
| US 10,352,228 | Liquid and gaseous multi-fuel compression ignition engines In force · From the USPTO record | In force | From the USPTO record |
Also on record, not counted in the 13: 19 lapsed for an unpaid fee · 1 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.
6 no status recorded