Also listed on Walker Digital, LLC, an earlier holder on the record. The recorded assignments below show how it moved.
Collateral for a security interest recorded Jul 3, 2025 (Deutsche Bank AG New York Branch).
Term ends May 12, 2029 · High confidence
20-year base term ends Dec 4, 2027
Held by IGT
Filed Dec 1, 2009 as application 12/517,661 · Granted Nov 13, 2012
Base term plus 525 days of patent term adjustment (USPTO delay)
Today
2007
2029
Clock starts
Dec 4, 2007
Dec 4, 2007
Term ends
May 12, 2029
May 12, 2029
Granted
Nov 13, 2012
Nov 13, 2012
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
525
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.
2
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 525 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 Dec 4, 2007, when application PCT/US2007/024801, the earliest non-provisional in its chain, was filed (this one was filed Dec 1, 2009) | Dec 4, 2027 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +525 days, USPTO patent term adjustment record | May 12, 2029 | 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 | May 12, 2029 | High confidence |
This family
| Application PCT/US2007/024801 | PCT application no patent term | no patent term |
| US 8,308,547 | this patent May 2029 | May 2029 |
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 22, 2009 Reel 23269, frame 368 | Walker, Jay S.; Tedesco, Daniel E.; Sammon, Russell P.; Tulley, Stephen C.; Scribner, Gregory J. | Walker Digital, LLC | Assignment of Assignor's Interest |
| Nov 4, 2009 Reel 23456, frame 940 | Walker Digital, LLC | IGT | Assignment of Assignor's Interest |
| Nov 30, 2009 Reel 23582, frame 921 | Walker, Jay S.; Sammon, Russell P.; Tedesco, Daniel E.; Tedesco, Robert C. | Walker Digital, LLC | Assignment of Assignor's Interest |
| Jul 3, 2025 Reel 71817, frame 394 | IGT | Deutsche Bank AG New York Branch, as Collateral Agent | Security Agreement |
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
May 2029
Term ends May 12, 2029. No further fees fall due before then
Note
The 525 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
48
later US patents cite this one
That is top 25% of utility patents granted in 2012 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.