Term ends Nov 22, 2037 · High confidence
20-year base term ends Aug 31, 2037
Held by Chemstone, Inc.
Filed Aug 31, 2017 as application 15/693,186 · Granted Aug 4, 2020
Base term plus 83 days of patent term adjustment (USPTO delay)
Today
2017
2037
Clock starts
Aug 31, 2017
Aug 31, 2017
Term ends
Nov 22, 2037
Nov 22, 2037
Granted
Aug 4, 2020
Aug 4, 2020
base term
patent term adjustment
fee events
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
83
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.
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 83 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 Aug 31, 2017, when this application, 15/693,186, was filed | Aug 31, 2037 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +83 days, USPTO patent term adjustment record | Nov 22, 2037 | 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 | Nov 22, 2037 | High confidence |
This family
| US 10,730,959 | this patent Nov 2037 | Nov 2037 |
| US 11,530,517 | In force Aug 2037 | Aug 2037 |
| US 11,345,831 | In force May 2038 | May 2038 |
| US 11,098,134 | In force Aug 2037 | Aug 2037 |
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 |
|---|---|---|---|
| Dec 1, 2017 Reel 44281, frame 515 | Basham, Daryl A; Basi, Nirmal S | HS Manufacturing Group, LLC | Assignment of Assignor's Interest |
| Dec 2, 2017 Reel 44281, frame 518 | Spender, Jonathan; Bilodeau, Michael Albert | University of Maine System Board of Trustees | Assignment of Assignor's Interest |
| Dec 2, 2017 Reel 44281, frame 521 | University of Maine System Board of Trustees | HS Manufacturing Group, LLC | Assignment of Assignor's Interest |
| Apr 13, 2019 Reel 48878, frame 665 | Spender, Jonathan; Bilodeau, Michael Albert | Univeristy of Maine System Board of Trustees | Assignment of Assignor's Interest |
| Apr 13, 2019 Reel 48878, frame 675 | University of Maine System Board of Trustees | HS Manufacturing Group, LLC | Assignment of Assignor's Interest |
| Apr 13, 2019 Reel 48878, frame 679 | Basham, Daryl Aubrey; Basi, Nirmal Singh | HS Manufacturing Group LLC | Assignment of Assignor's Interest |
| May 2, 2019 Reel 49063, frame 560 | Univeristy of Maine System Board of Trustees | HS Manufacturing Group LLC | Assignment of Assignor's Interest |
| Jan 5, 2024 Reel 66193, frame 940 | Greentech Global Pte. Ltd. | Chemstone, 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.
What's changing
Nov 2037
Term ends Nov 22, 2037. Maintenance fees still fall due before then
Note
The 83 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
10
later US patents cite this one
That is top 25% of utility patents granted in 2020 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.