Term ends Mar 29, 2032 · Medium confidence
20-year base term ends Mar 29, 2032
Why Medium: A parent in the chain could not be resolved.
Held by Liquidpiston, Inc.
Filed Jul 17, 2012 as application 13/551,032 · Granted Sep 3, 2013
Base term, 20 years from filing
Today
2012
2032
Clock starts
Mar 29, 2012
Mar 29, 2012
Term ends
Mar 29, 2032
Mar 29, 2032
Granted
Sep 3, 2013
Sep 3, 2013
base term
fee events
Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
None
Term adjustment
No prosecution delay on this record.
None
Terminal disclaimer
No disclaimer on this record.
3 of 3
Maintenance fees paid
Three maintenance fees fall due, at 3.5, 7.5 and 11.5 years from grant. This counts the ones the record shows paid.
46
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
This patent's term is its 20-year base term, with no adjustment for prosecution delay. All three maintenance fees are recorded paid; no more fees are due. Confidence: Medium. from the record
How we calculated this date
One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Mar 29, 2012, when application 13/434,827, the earliest non-provisional in its chain, was filed (this one was filed Jul 17, 2012); a parent in its chain could not be resolved (the next row) | Mar 29, 2032 | High confidence |
| Continuity chain | A parent in the chain could not be resolved | dated from this application's own claim | Medium confidence |
| Patent term adjustment | None on file | no change | High confidence |
| Terminal disclaimer cap | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Mar 29, 2032 | Medium confidence |
This family
| US 7,191,738 | Term ended Jul 2023 | Jul 2023 |
| Application PCT/US2005/000932 | PCT application no patent term | no patent term |
| US 7,909,013 | In force Oct 2028 | Oct 2028 |
| US 8,365,698 | In force Jul 2029 | Jul 2029 |
| Application 61/085,928 | Provisional application no patent term | no patent term |
| Application 61/149,889 | Provisional application no patent term | no patent term |
| Application 61/154,539 | Provisional application no patent term | no patent term |
| Application 61/184,627 | Provisional application no patent term | no patent term |
8 of 46 applications in this family shown, earliest filings first. The applications whose file history this site holds. The family may have others.
Assignments
Assignment documents as recorded at the USPTO, oldest first, with the reel and frame each was recorded at. A recorded assignment is a filed document, not a statement of current ownership, and the absence of a later one is not evidence that the last one still stands.
| Recorded | Assignor | Assignee | Conveyance |
|---|---|---|---|
| Nov 15, 2012 Reel 29305, frame 488 | Shkolnik, Nikolay; Shkolnik, Alexander C. | Liquidpiston, Inc. | Assignment of Assignor's Interest |
| Dec 16, 2015 Reel 37307, frame 760 | Liquidpiston, Inc. | Adams Capital Management IV, L.P.; Northwater Intellectual Property Fund L.P. 2 | Security Interest |
| Dec 16, 2015 reel/frame not recorded | Liquidpiston, Inc. | Adams Capital Management IV, L.P. | Security Interest |
| Dec 16, 2015 reel/frame not recorded | Liquidpiston, Inc. | Northwater Intellectual Property Fund L.P. 2 | Security Interest |
| Nov 23, 2016 Reel 40410, frame 559 | Adams Capital Management IV, L.P.; Northwater Intellectual Property Fund L.P.2 | Liquidpiston, Inc. | Release of Security Interest |
Sources
Google Patents · The patent document at USPTO · Assignment records at USPTO
USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup
Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Mar 2032
Term ends Mar 29, 2032. No further fees fall due before then
Citations
41
later US patents cite this one
That is top 25% of utility patents granted in 2013 in our data, the only group it is compared against.
How we rank
Every date shows its work: the base term, any term adjustment or extension, any disclaimer cap, and the maintenance fee record, each with a confidence tier. How this record was built
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.