Lapsed May 7, 2023 on the fee record · High confidence
20-year base term ends Nov 22, 2037
First maintenance fee unpaid; grace period ended.
Held by Microjet Technology Co., Ltd.
Filed Nov 22, 2017 as application 15/821,075 · Granted May 7, 2019
Base term, 20 years from filing, plus 1 days of patent term adjustment (USPTO delay)
Today
Lapsed May 7, 2023
2017
2037
Clock starts
Nov 22, 2017
Nov 22, 2017
No longer in force
May 7, 2023
May 7, 2023
Granted
May 7, 2019
May 7, 2019
Term would have run to
Nov 23, 2037
Nov 23, 2037
base term
after the term ends
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
1
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
0 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.
2
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
Its term would have run to Nov 23, 2037: its 20-year base term plus 1 days of term adjustment for prosecution delay. 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 Nov 22, 2017, when this application, 15/821,075, was filed | Nov 22, 2037 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +1 days, USPTO patent term adjustment record | Nov 23, 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 | 0 of 3 maintenance fees paid | lapsed May 7, 2023 | High confidence |
| Computed term end | The steps above, in order | May 7, 2023 | High confidence |
This family
| US 10,285,307 | this patent May 2023 | May 2023 |
| US 10,438,868 | In force Nov 2037 | Nov 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 8, 2017 Reel 44339, frame 324 | Chen, Shih-chang; Liao, Jia-yu; Han, Yung-lung; Huang, Chi-feng | Microjet Technology Co., Ltd. | 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.
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Alerts on its grants, lapses and transfers.
What's changing
Note
The 1 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
35
later US patents cite this one
That is top 10% of utility patents granted in 2019 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.