Term ends Sep 25, 2035 · High confidence
20-year base term ends Mar 26, 2038
Held by Tokyo Electron Limited
Filed Mar 26, 2018 as application 15/935,580 · Granted Jan 4, 2022
Base term, 20 years from filing · capped by a resolved terminal disclaimer
Today
2018
2038
Clock starts
Mar 26, 2018
Mar 26, 2018
Term ends
Sep 25, 2035
Sep 25, 2035
Granted
Jan 4, 2022
Jan 4, 2022
base term
after the term ends
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
None
Term adjustment
No prosecution delay on this record.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 10,290,476.
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.
56
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 is its 20-year base term, with no adjustment for prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 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 Mar 26, 2018, when this application, 15/935,580, was filed | Mar 26, 2038 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 10,290,476) | capped to Sep 25, 2035 | 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 | Sep 25, 2035 | High confidence |
This family
| US 11,214,864 | this patent Sep 2035 | Sep 2035 |
| US 10,593,541 | In force May 2038 | May 2038 |
| US 10,607,835 | In force Nov 2036 | Nov 2036 |
| US 10,424,491 | In force Nov 2036 | Nov 2036 |
| US 10,553,409 | In force May 2038 | May 2038 |
| US 11,037,763 | In force Dec 2038 | Dec 2038 |
| US 11,462,444 | In force Aug 2038 | Aug 2038 |
| US 10,366,888 | In force Jun 2038 | Jun 2038 |
8 of 56 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 |
|---|---|---|---|
| Mar 28, 2018 Reel 45367, frame 927 | Umehara, Takahito | Tokyo Electron Limited | 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
Sep 2035
Term ends Sep 25, 2035. Maintenance fees still fall due before then
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 10,290,476.
Citations
2
later US patents cite this one
That is above the median 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.