Term ends Aug 25, 2027 · High confidence
20-year base term ended Mar 29, 2026
No current holder resolved from the recorded chain.
Filed Mar 29, 2006 as application 11/391,988 · Granted Apr 5, 2011
Base term plus 514 days of patent term adjustment (USPTO delay)
Today
2006
2027
Clock starts
Mar 29, 2006
Mar 29, 2006
Term ends
Aug 25, 2027
Aug 25, 2027
Granted
Apr 5, 2011
Apr 5, 2011
base term
patent term adjustment
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
514
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.
23
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 514 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 Mar 29, 2006, when this application, 11/391,988, was filed | Mar 29, 2026 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +514 days, USPTO patent term adjustment record | Aug 25, 2027 | 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 | Aug 25, 2027 | High confidence |
This family
| US 7,918,887 | this patent Aug 2027 | Aug 2027 |
| US 8,099,168 | In force Jan 2030 | Jan 2030 |
| US 8,906,027 | In force Mar 2031 | Mar 2031 |
| US 8,372,147 | Term ended Oct 2026 | Oct 2026 |
| US 8,372,153 | Term ended Oct 2026 | Oct 2026 |
| US 8,444,654 | Term ended Aug 2026 | Aug 2026 |
| US 8,449,556 | Term ended Aug 2026 | Aug 2026 |
| US 8,594,796 | In force Oct 2029 | Oct 2029 |
8 of 23 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 9, 2020 Reel 54365, frame 169 | Orthosensor, Inc. | Stryker Corporation | Security Interest |
| Dec 18, 2024 Reel 69737, frame 184 | Stryker Corporation | Stryker Corporation | Change of Address |
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.
What's changing
Aug 2027
Term ends Aug 25, 2027. No further fees fall due before then
Note
The 514 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
206
later US patents cite this one
That is top 5% of utility patents granted in 2011 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.