Term ends Feb 13, 2035 · Medium confidence
20-year base term ends Feb 13, 2035
Why Medium: The disclaimer's references carry disclaimers of their own not yet read (US 10,045,980), so the cap could be lower.
Held by Respivert Limited
Filed Sep 24, 2020 as application 17/031,190 · Granted Apr 25, 2023
Base term, 20 years from filing
Today
2015
2035
Clock starts
Feb 13, 2015
Feb 13, 2015
Term ends
Feb 13, 2035
Feb 13, 2035
Granted
Apr 25, 2023
Apr 25, 2023
base term
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
None
Term adjustment
No prosecution delay on this record.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 10,045,980, US 10,815,217, US 9,884,845, to Feb 13, 2035. The term already ends on or before that date, so the cap shortened nothing.
1 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. This counts the ones the record shows paid.
5
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 is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. 1 of 2 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 Feb 13, 2015, when application 14/622,368, the earliest non-provisional in its chain, was filed (this one was filed Sep 24, 2020) | Feb 13, 2035 | 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 10,045,980, US 10,815,217, US 9,884,845) | resolves to Feb 13, 2035, no earlier than this term, so no change | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Feb 13, 2035 | Medium confidence |
This family
| US 9,447,076 | In force Feb 2035 | Feb 2035 |
| US 9,624,196 | In force Feb 2035 | Feb 2035 |
| US 10,045,980 | In force no later than Feb 2035 | no later than Feb 2035 |
| US 10,815,217 | In force Feb 2035 | Feb 2035 |
| US 11,634,406 | this patent Feb 2035 | Feb 2035 |
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 |
|---|---|---|---|
| Sep 25, 2020 Reel 53880, frame 986 | Longshaw, Alistair Ian; Fraser Fordyce, Euan Alexander; Onions, Stuart Thomas; King-underwood, John; Venable, Jennifer | Respivert Ltd.; Topivert Pharma Ltd. | Assignment of Assignor's Interest |
| Sep 25, 2020 Reel 53881, frame 749 | Topivert Pharma Limited | Respivert Limited | Assignment of Assignor's Interest |
| Sep 25, 2020 reel/frame not recorded | Venable, Jennifer; King-underwood, John; Longshaw, Alistair Ian; Onions, Stuart Thomas; Fraser Fordyce, Euan Alexander | Respivert Ltd. | Assignment of Assignor's Interest |
| Sep 25, 2020 reel/frame not recorded | Venable, Jennifer; King-underwood, John; Longshaw, Alistair Ian; Onions, Stuart Thomas; Fraser Fordyce, Euan Alexander | Topivert Pharma 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Feb 2035
Term ends Feb 13, 2035. Maintenance fees still fall due before then
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 10,045,980, US 10,815,217, US 9,884,845, ends no earlier than this term, so it caps nothing.
Citations
0
later US patents cite this one
That is below the median of utility patents granted in 2023 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.