Term ends Dec 10, 2028 · Medium confidence
20-year base term ends Dec 10, 2028
Why Medium: A parent in the chain could not be resolved.
Held by Reg Synthetic Fuels, LLC
Filed Aug 17, 2021 as application 17/404,557 · Granted Apr 11, 2023
Base term, 20 years from filing
Today
2008
2028
Clock starts
Dec 10, 2008
Dec 10, 2008
Term ends
Dec 10, 2028
Dec 10, 2028
Granted
Apr 11, 2023
Apr 11, 2023
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.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 10,717,687, US 8,231,804, to Dec 10, 2028. The term already ends on or before that date, so the cap shortened nothing.
1 of 1
Maintenance fees paid
One maintenance fee can end this term early, the one due 3.5 years from grant; the next one's grace period runs past the term end. This counts it if the record shows it paid.
9
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. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. 1 of 1 maintenance fees is paid so far. 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 Dec 10, 2008, when application 12/331,906, the earliest non-provisional in its chain, was filed (this one was filed Aug 17, 2021); a parent in its chain could not be resolved (the next row) | Dec 10, 2028 | 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 | Disclaimer resolved from the filed document (refs US 10,717,687, US 8,231,804) | resolves to Dec 10, 2028, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 1 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Dec 10, 2028 | Medium confidence |
This family
| US 8,231,804 | In force Apr 2029 | Apr 2029 |
| US 9,963,401 | In force Jun 2029 | Jun 2029 |
| US 10,717,687 | In force Apr 2029 | Apr 2029 |
| US 11,097,994 | In force Dec 2028 | Dec 2028 |
| US 11,623,899 | this patent Dec 2028 | Dec 2028 |
| US 12,516,002 | In force Feb 2029 | Feb 2029 |
| Application 19/412,727 | Pending not computed | not computed |
7 of 9 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 |
|---|---|---|---|
| Sep 30, 2021 Reel 57663, frame 180 | Abhari, Ramin; Tomlinson, H. Lynn; Gruver, Vladimir | Syntroleum Corporation | Assignment of Assignor's Interest |
| Sep 30, 2021 Reel 57663, frame 213 | Syntroleum Corporation | Reg Synthetic Fuels, LLC | Assignment of Assignor's 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.
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Alerts on its grants, lapses and transfers.
What's changing
Dec 2028
Term ends Dec 10, 2028. No further fees fall due before then
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 10,717,687, US 8,231,804, ends no earlier than this term, so it caps nothing.
Citations
0
later US patents cite this one
That is below the median of utility patents granted in 2023 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.