Lapsed Sep 27, 2026 on the fee record · High confidence
20-year base term ends Oct 5, 2037
First maintenance fee unpaid; grace period ended.
Held by Switchback Systems, Inc.
Filed Mar 4, 2019 as application 16/330,357 · Granted Sep 27, 2022
Base term, 20 years from filing, plus 531 days of patent term adjustment (USPTO delay)
Today
Lapsed Sep 27, 2026
2017
2039
Clock starts
Oct 5, 2017
Oct 5, 2017
No longer in force
Sep 27, 2026
Sep 27, 2026
Granted
Sep 27, 2022
Sep 27, 2022
Term would have run to
Mar 20, 2039
Mar 20, 2039
base term
patent term adjustment
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
531
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 Mar 20, 2039: its 20-year base term plus 531 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 Oct 5, 2017, when application PCT/US2017/055435, the earliest non-provisional in its chain, was filed (this one was filed Mar 4, 2019) | Oct 5, 2037 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +531 days, USPTO patent term adjustment record | Mar 20, 2039 | 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 Sep 27, 2026 | High confidence |
| Computed term end | The steps above, in order | Sep 27, 2026 | High confidence |
This family
| Application PCT/US2017/055435 | PCT application no patent term | no patent term |
| US 11,453,910 | this patent Sep 2026 | Sep 2026 |
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 |
|---|---|---|---|
| May 3, 2019 Reel 49074, frame 326 | Huber, Martin | Quantapore, Inc. | Assignment of Assignor's Interest |
| Nov 22, 2024 Reel 69387, frame 139 | Quantapore, Inc. | Switchback Systems, 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.
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Alerts on its grants, lapses and transfers.
What's changing
Note
The 531 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
0
later US patents cite this one
That is below 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.