Term ended Aug 2, 2026 · High confidence
20-year base term ended Mar 29, 2026
No current holder resolved from the recorded chain.
Filed Jan 28, 2011 as application 13/015,685 · Granted May 28, 2013
Base term plus 126 days of patent term adjustment (USPTO delay)
Today
Term ended Aug 2, 2026
2006
2026
Clock starts
Mar 29, 2006
Mar 29, 2006
Term ended
Aug 2, 2026
Aug 2, 2026
Granted
May 28, 2013
May 28, 2013
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
126
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 7,918,887, US 8,372,147, US 8,372,153, US 8,444,654, to Aug 2, 2026. The term already ends on or before that date, so the cap shortened nothing.
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 126 days past its 20-year base term on prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. 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 Mar 29, 2006, when application 11/391,988, the earliest non-provisional in its chain, was filed (this one was filed Jan 28, 2011) | Mar 29, 2026 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +126 days, USPTO patent term adjustment record | Aug 2, 2026 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 7,918,887, US 8,372,147, US 8,372,153, US 8,444,654) | resolves to Aug 2, 2026, no earlier than this term, so no change | 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 | Aug 2, 2026 | High confidence |
This family
| US 7,918,887 | In force 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 | this patent 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
Note
The 126 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 7,918,887, US 8,372,147, US 8,372,153, US 8,444,654, ends no earlier than this term, so it caps nothing.
Citations
46
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.