Term ends Aug 10, 2032 · High confidence
20-year base term ends Aug 10, 2032
Filed Aug 10, 2012 as application 13/571,675 · Granted Sep 3, 2013
Base term, 20 years from filing
Today
2012
2032
Clock starts
Aug 10, 2012
Aug 10, 2012
Term ends
Aug 10, 2032
Aug 10, 2032
Granted
Sep 3, 2013
Sep 3, 2013
base term
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
None
Term adjustment
No prosecution delay on this record.
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.
61
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 is its 20-year base term, with no adjustment for 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 Aug 10, 2012, when this application, 13/571,675, was filed | Aug 10, 2032 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | 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 10, 2032 | High confidence |
This family
| US 8,920,616 | In force Feb 2033 | Feb 2033 |
| US 8,488,419 | In force Jul 2032 | Jul 2032 |
| US 8,524,511 | this patent Aug 2032 | Aug 2032 |
| US 8,582,240 | In force Aug 2032 | Aug 2032 |
| US 8,860,156 | In force Sep 2032 | Sep 2032 |
| US 8,654,618 | In force Sep 2032 | Sep 2032 |
| US 8,755,149 | In force Sep 2032 | Sep 2032 |
| US 8,498,079 | In force Sep 2032 | Sep 2032 |
8 of 61 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 |
|---|---|---|---|
| Sep 5, 2012 Reel 28896, frame 763 | Zhong, Tom; Lam, Vinh; Teng, Zhongjian | Headway Technologies, Inc. | Assignment of Assignor's Interest |
| Mar 25, 2019 Reel 48692, frame 917 | Headway Technologies, Inc. | Taiwan Semiconductor Manufacturing Company, Ltd. | 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
Aug 2032
Term ends Aug 10, 2032. No further fees fall due before then
Citations
6
later US patents cite this one
That is below the median 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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.