Also listed on Purdue Research Foundation, an earlier holder on the record. The recorded assignments below show how it moved.
Term ended Nov 5, 2026 · High confidence
20-year base term ended Apr 24, 2022
Held by Endocyte, Inc.
Filed Jun 21, 2004 as application 10/475,876 · Granted Jan 25, 2011
Base term plus 1656 days of patent term adjustment (USPTO delay)
Today
Term ended Nov 5, 2026
2002
2026
Clock starts
Apr 24, 2002
Apr 24, 2002
Term ended
Nov 5, 2026
Nov 5, 2026
Granted
Jan 25, 2011
Jan 25, 2011
base term
patent term adjustment
after the term ends
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
1,656
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
3 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.
This patent's term runs 1656 days past its 20-year base term on prosecution delay. All three maintenance fees were paid, so no fee lapse ended it. 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 Apr 24, 2002, when application PCT/US2002/013045, the earliest non-provisional in its chain, was filed (this one was filed Jun 21, 2004) | Apr 24, 2022 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +1656 days, USPTO patent term adjustment record | Nov 5, 2026 | 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 | 3 of 3 maintenance fees paid | term ended | High confidence |
| Computed term end | The steps above, in order | Nov 5, 2026 | High confidence |
This family
| Application PCT/US2002/013045 | PCT application no patent term | no patent term |
| US 7,875,612 | this patent Nov 2026 | Nov 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 |
|---|---|---|---|
| Oct 24, 2003 Reel 15310, frame 636 | Green, Mark A.; Ke, Chun-yen | Purdue Research Foundation | Assignment of Assignor's Interest |
| Oct 24, 2003 Reel 15307, frame 326 | Leamon, Christopher P. | Endocyte, Inc. | Assignment of Assignor's Interest |
| Oct 23, 2008 Reel 21729, frame 65 | Purdue University | National Institutes of Health (Nih), U.S. Dept. of Health and Human Services (DHHS), U.S. Government | Confirmatory License |
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.
What's changing
Note
The 1656 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
15
later US patents cite this one
That is above the median of utility patents granted in 2011 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.