Also listed on Isolere Bio, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Feb 19, 2041 · High confidence
20-year base term ends Feb 19, 2041
Held by Donaldson Company, Inc.
Filed Oct 5, 2021 as application 17/493,938 · Granted Feb 28, 2023
Base term, 20 years from filing
Today
2021
2041
Clock starts
Feb 19, 2021
Feb 19, 2021
Term ends
Feb 19, 2041
Feb 19, 2041
Granted
Feb 28, 2023
Feb 28, 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.
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 is its 20-year base term, with no adjustment for prosecution delay. 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 Feb 19, 2021, when application PCT/US2021/018805, the earliest non-provisional in its chain, was filed (this one was filed Oct 5, 2021) | Feb 19, 2041 | 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 | 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 | Feb 19, 2041 | High confidence |
This family
| Application PCT/US2021/018805 | PCT application no patent term | no patent term |
| US 11,591,576 | this patent Feb 2041 | Feb 2041 |
| Application 17/904,535 | Abandoned not computed | not computed |
| US 12,692,483 | In force Feb 2041 | Feb 2041 |
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 |
|---|---|---|---|
| Nov 3, 2021 Reel 58789, frame 39 | Luginbuhl, Kelli M.; Dzuricky, Michael | Isolere Bio, Inc. | Corrective Assignment to Correct the Application No. from 17/493,428 to Be Under 17/493,938 Previously Recorded on Reel 057706 Frame 0185. Assignor(S) Hereby Confirms the This Assignment. |
| Jun 8, 2023 Reel 63893, frame 52 | Isolere Bio, Inc. | Donaldson Company, Inc. | Assignment of Assignor's Interest |
| Jun 27, 2023 Reel 64072, frame 449 | Isolere Bio, Inc. | Donaldson Company, 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Feb 2041
Term ends Feb 19, 2041. Maintenance fees still fall due before then
Citations
5
later US patents cite this one
That is top 25% 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.