Collateral for a security interest recorded Jul 29, 2025 (PLF 2025-A LP).
Term ends Mar 15, 2033 · High confidence
20-year base term ends Mar 15, 2033
Held by Teratech Corporation
Filed Dec 6, 2017 as application 15/833,547 · Granted Nov 23, 2021
Base term plus 711 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
2013
2033
Clock starts
Mar 15, 2013
Mar 15, 2013
Term ends
Mar 15, 2033
Mar 15, 2033
Granted
Nov 23, 2021
Nov 23, 2021
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
711
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 9,877,699.
1 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. This counts the ones the record shows paid.
14
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 711 days past its 20-year base term on prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 1 of 2 maintenance fees is 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 Mar 15, 2013, when application 13/838,694, the earliest non-provisional in its chain, was filed (this one was filed Dec 6, 2017) | Mar 15, 2033 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +711 days, USPTO patent term adjustment record | Feb 24, 2035 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 9,877,699) | capped to Mar 15, 2033 | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Mar 15, 2033 | High confidence |
This family
| US 10,667,790 | In force Mar 2033 | Mar 2033 |
| Application PCT/US2013/033941 | PCT application no patent term | no patent term |
| US 9,877,699 | In force Mar 2033 | Mar 2033 |
| Application PCT/US2014/057516 | PCT application no patent term | no patent term |
| US 12,588,893 | In force Mar 2033 | Mar 2033 |
| US 11,179,138 | this patent Mar 2033 | Mar 2033 |
| US 12,115,023 | In force Dec 2033 | Dec 2033 |
| US 11,857,363 | In force Mar 2033 | Mar 2033 |
8 of 14 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 |
|---|---|---|---|
| Jan 30, 2018 Reel 44771, frame 631 | Chiang, Alice M.; Wong, William M.; Berger, Noah | Teratech Corporation | Assignment of Assignor's Interest |
| Jul 29, 2025 Reel 71862, frame 356 | Teratech Corp. | PLF 2025-A LP | Security 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
Mar 2033
Term ends Mar 15, 2033. Maintenance fees still fall due before then
Note
The 711 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 9,877,699.
Citations
9
later US patents cite this one
That is top 25% of utility patents granted in 2021 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.