Also listed on Greentech Global Pte. Ltd., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends May 23, 2038 · Medium confidence
20-year base term ends Aug 31, 2037
Why Medium: A parent in the chain could not be resolved.
Held by Chemstone, Inc.
Filed Sep 12, 2019 as application 16/568,953 · Granted May 31, 2022
Base term plus 265 days of patent term adjustment (USPTO delay)
Today
2017
2038
Clock starts
Aug 31, 2017
Aug 31, 2017
Term ends
May 23, 2038
May 23, 2038
Granted
May 31, 2022
May 31, 2022
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
265
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 265 days past its 20-year base term on prosecution delay. 1 of 3 maintenance fees is paid so far. 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 Aug 31, 2017, when application 15/693,186, the earliest non-provisional in its chain, was filed (this one was filed Sep 12, 2019); a parent in its chain could not be resolved (the next row) | Aug 31, 2037 | High confidence |
| Continuity chain | A parent in the chain could not be resolved | dated from this application's own claim | Medium confidence |
| Patent term adjustment | +265 days, USPTO patent term adjustment record | May 23, 2038 | 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 | May 23, 2038 | Medium confidence |
This family
| US 10,730,959 | In force Nov 2037 | Nov 2037 |
| US 11,530,517 | In force Aug 2037 | Aug 2037 |
| US 11,345,831 | this patent 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 |
|---|---|---|---|
| Feb 25, 2020 Reel 51917, frame 22 | Spender, Jonathan; Bilodeau, Michael A; Mikail, Samuel | SM Technology Holdings LLC | Assignment of Assignor's Interest |
| Mar 3, 2020 Reel 51998, frame 762 | SM Technology Holdings LLC | Greentech Global Pte. Ltd. | Assignment of Assignor's Interest |
| Jan 5, 2021 Reel 54899, frame 396 | Greentech Global Pte. Ltd. | Greentech Global Pte. Ltd. | Change of Address |
| Jan 8, 2024 Reel 66221, frame 330 | 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
May 2038
Term ends May 23, 2038. Maintenance fees still fall due before then
Note
The 265 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
6
later US patents cite this one
That is top 25% of utility patents granted in 2022 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.