Term ends Apr 11, 2029 · High confidence
20-year base term ends Apr 9, 2029
Held by TP Lab, Inc.
Filed Jan 22, 2013 as application 13/747,473 · Granted Mar 8, 2016
Base term plus 2 days of patent term adjustment (USPTO delay)
Today
2009
2029
Clock starts
Apr 9, 2009
Apr 9, 2009
Term ends
Apr 11, 2029
Apr 11, 2029
Granted
Mar 8, 2016
Mar 8, 2016
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
2
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 8,387,094, to Apr 11, 2029. The term already ends on or before that date, so the cap shortened nothing.
2 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.
4
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 2 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. 2 of 3 maintenance fees are paid so far. 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 Apr 9, 2009, when application 12/421,432, the earliest non-provisional in its chain, was filed (this one was filed Jan 22, 2013) | Apr 9, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +2 days, USPTO patent term adjustment record | Apr 11, 2029 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,387,094) | resolves to Apr 11, 2029, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Apr 11, 2029 | High confidence |
This family
| US 8,387,094 | In force Apr 2030 | Apr 2030 |
| US 9,282,372 | this patent Apr 2029 | Apr 2029 |
| US 9,602,892 | In force Apr 2029 | Apr 2029 |
| US 10,070,185 | In force Apr 2029 | Apr 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 |
|---|---|---|---|
| Jan 23, 2013 Reel 29674, frame 565 | Ho, Chi Fai; Chiu, Shin Cheung Simon; Chung, Bok Knun Randolph | TP Lab, Inc. | 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
Apr 2029
Term ends Apr 11, 2029. Maintenance fees still fall due before then
Note
The 2 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 8,387,094, ends no earlier than this term, so it caps nothing.
Citations
2
later US patents cite this one
That is below the median of utility patents granted in 2016 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.