Term ended Dec 28, 2025 · Medium confidence
20-year base term ended Sep 29, 2023
Why Medium: A parent in the chain could not be resolved.
No current holder resolved from the recorded chain.
Filed Apr 16, 2004 as application 10/826,814 · Granted Jun 2, 2009
Base term plus 821 days of patent term adjustment (USPTO delay)
Today
Term ended Dec 28, 2025
2003
2026
Clock starts
Sep 29, 2003
Sep 29, 2003
Term ended
Dec 28, 2025
Dec 28, 2025
Granted
Jun 2, 2009
Jun 2, 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
821
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.
12
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 821 days past its 20-year base term on prosecution delay. All three maintenance fees were paid, so no fee lapse ended it. 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 Sep 29, 2003, when application 10/674,057, the earliest non-provisional in its chain, was filed (this one was filed Apr 16, 2004); a parent in its chain could not be resolved (the next row) | Sep 29, 2023 | 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 | +821 days, USPTO patent term adjustment record | Dec 28, 2025 | 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 | Dec 28, 2025 | Medium confidence |
This family
| US 8,060,755 | Term ended Oct 2025 | Oct 2025 |
| US 7,900,055 | Term ended Jul 2026 | Jul 2026 |
| US 7,392,400 | Term ended Nov 2025 | Nov 2025 |
| US 7,529,367 | Term ended Dec 2025 | Dec 2025 |
| US 7,502,943 | In force Apr 2028 | Apr 2028 |
| US 7,529,368 | Term ended Jan 2026 | Jan 2026 |
| US 7,539,876 | Term ended Oct 2025 | Oct 2025 |
| US 7,542,566 | this patent Dec 2025 | Dec 2025 |
8 of 12 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 |
|---|---|---|---|
| Jul 16, 2004 Reel 16246, frame 837 | Henry, G. Glenn; Crispin, Thomas A.; Parks, Terry | Via Technologies, Inc. | Responses to Non-Recordation |
| Mar 29, 2005 Reel 16403, frame 281 | Henry, G. Glenn; Crispin, Thomas A.; Parks, Terry | Via Technologies, Inc. | To Corrective Document (Reel/Frame Not Recorded - See Attached) |
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 821 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
3
later US patents cite this one
That is below 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.