Term ends Oct 13, 2033 · High confidence
20-year base term ends Apr 3, 2033
Held by Worcester Polytechnic Institute
Filed Oct 19, 2018 as application 16/164,952 · Granted Sep 21, 2021
Base term plus 193 days of patent term adjustment (USPTO delay)
Today
2013
2033
Clock starts
Apr 3, 2013
Apr 3, 2013
Term ends
Oct 13, 2033
Oct 13, 2033
Granted
Sep 21, 2021
Sep 21, 2021
base term
patent term adjustment
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
193
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
1 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.
13
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 193 days past its 20-year base term on prosecution delay. 1 of 3 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 Apr 3, 2013, when application 13/855,994, the earliest non-provisional in its chain, was filed (this one was filed Oct 19, 2018) | Apr 3, 2033 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +193 days, USPTO patent term adjustment record | Oct 13, 2033 | 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 | 1 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Oct 13, 2033 | High confidence |
This family
| US 9,834,827 | In force (reinstated) Oct 2033 | Oct 2033 |
| US 9,431,672 | Lapsed on the fee record Aug 2024 | Aug 2024 |
| US 10,547,044 | In force Sep 2036 | Sep 2036 |
| US 10,522,884 | In force Jan 2034 | Jan 2034 |
| US 11,127,992 | this patent Oct 2033 | Oct 2033 |
| US 11,955,613 | In force Oct 2033 | Oct 2033 |
| US 11,502,345 | In force Apr 2033 | Apr 2033 |
| US 12,074,302 | In force Aug 2033 | Aug 2033 |
8 of 13 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 29, 2021 Reel 57021, frame 849 | Wang, Yan; Gratz, Eric; S.A., Qina; Zheng, Zhangfeng; Heelan, Joseph | Worcester Polytechnic Institute | 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.
What's changing
Oct 2033
Term ends Oct 13, 2033. Maintenance fees still fall due before then
Note
The 193 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
16
later US patents cite this one
That is top 10% 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.