Term ends Jan 8, 2030 · Medium confidence
20-year base term ends Jan 8, 2030
Why Medium: The disclaimer's references carry disclaimers of their own not yet read (US 8,514,502), so the cap could be lower.
Held by Largan Precision Co., Ltd.
Filed Mar 29, 2012 as application 13/433,438 · Granted Aug 27, 2013
Base term, 20 years from filing
Today
2010
2030
Clock starts
Jan 8, 2010
Jan 8, 2010
Term ends
Jan 8, 2030
Jan 8, 2030
Granted
Aug 27, 2013
Aug 27, 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.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 8,233,224, US 8,514,502, to Jan 8, 2030. 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.
17
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. 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 are recorded paid; no more fees are due. 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 Jan 8, 2010, when application 12/654,912, the earliest non-provisional in its chain, was filed (this one was filed Mar 29, 2012) | Jan 8, 2030 | 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 | Disclaimer resolved from the filed document (refs US 8,233,224, US 8,514,502) | resolves to Jan 8, 2030, no earlier than this term, so no change | Medium 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 | Jan 8, 2030 | Medium confidence |
This family
| US 8,233,224 | In force Oct 2030 | Oct 2030 |
| US 8,520,324 | this patent Jan 2030 | Jan 2030 |
| US 8,514,502 | In force no later than Jan 2030 | no later than Jan 2030 |
| US 8,736,981 | In force Jan 2030 | Jan 2030 |
| US 8,670,190 | In force Jan 2030 | Jan 2030 |
| US 8,670,191 | In force Jan 2030 | Jan 2030 |
| US 8,693,111 | In force Jan 2030 | Jan 2030 |
| US 9,465,197 | In force Feb 2030 | Feb 2030 |
8 of 17 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 |
|---|---|---|---|
| Mar 29, 2012 Reel 27952, frame 304 | Chen, Chun-shan | Largan Precision Co., 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.
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Alerts on its grants, lapses and transfers.
What's changing
Jan 2030
Term ends Jan 8, 2030. No further fees fall due before then
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 8,233,224, US 8,514,502, ends no earlier than this term, so it caps nothing.
Citations
13
later US patents cite this one
That is above 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.