Term ended Feb 6, 2026 · High confidence
20-year base term ended Sep 12, 2025
Held by Pratt & Whitney Canada Corp.
Filed Aug 29, 2006 as application 11/468,036 · Granted Feb 24, 2009
Base term plus 147 days of patent term adjustment (USPTO delay)
Today
Term ended Feb 6, 2026
2005
2026
Clock starts
Sep 12, 2005
Sep 12, 2005
Term ended
Feb 6, 2026
Feb 6, 2026
Granted
Feb 24, 2009
Feb 24, 2009
base term
patent term adjustment
after the term ends
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
147
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
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.
4
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 runs 147 days past its 20-year base term on prosecution delay. All three maintenance fees were paid, so no fee lapse ended it. Confidence: High. 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 Sep 12, 2005, when application 11/223,129, the earliest non-provisional in its chain, was filed (this one was filed Aug 29, 2006) | Sep 12, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +147 days, USPTO patent term adjustment record | Feb 6, 2026 | 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 | term ended | High confidence |
| Computed term end | The steps above, in order | Feb 6, 2026 | High confidence |
This family
| US 7,530,782 | In force Jan 2027 | Jan 2027 |
| US 7,628,578 | In force no later than Nov 2026 | no later than Nov 2026 |
| US 7,637,718 | In force Nov 2026 | Nov 2026 |
| US 7,494,316 | this patent Feb 2026 | Feb 2026 |
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 10, 2006 Reel 18507, frame 280 | Barnett, Barry; Denis, David | Pratt & Whitney Canada Corp. | 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Note
The 147 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
17
later US patents cite this one
That is above the median of utility patents granted in 2009 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.