Also listed on The P.F. Laboratories, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Jun 16, 2028 · High confidence
20-year base term ended Feb 27, 2026
Held by Purdue Pharma L.P.
Filed Sep 28, 2007 as application 11/885,402 · Granted May 10, 2011
Base term plus 840 days of patent term adjustment (USPTO delay)
Today
2006
2028
Clock starts
Feb 27, 2006
Feb 27, 2006
Term ends
Jun 16, 2028
Jun 16, 2028
Granted
May 10, 2011
May 10, 2011
base term
patent term adjustment
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
840
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 840 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 27, 2006, when application PCT/EP2006/001798, the earliest non-provisional in its chain, was filed (this one was filed Sep 28, 2007) | Feb 27, 2026 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +840 days, USPTO patent term adjustment record | Jun 16, 2028 | 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 | In force | High confidence |
| Computed term end | The steps above, in order | Jun 16, 2028 | High confidence |
This family
| US 7,939,543 | this patent Jun 2028 | Jun 2028 |
1 of 2 applications in this family shown, earliest filings first. 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 24, 2007 Reel 19870, frame 714 | Kupper, Robert J. | Euro-Celtique S.A. | Assignment of Assignor's Interest |
| Oct 9, 2007 Reel 19939, frame 72 | Euro-Celtique S.A. | Purdue Pharme L.P. | Assignment of Assignor's Interest |
| Jan 26, 2012 Reel 27598, frame 389 | Purdue Pharma L.P. | Purdue Pharma L.P.; The P.F. Laboratories, Inc.; Purdue Pharmaceuticals L.P.; Rhodes Technologies | Assignment of Assignor's Interest |
| Jan 26, 2012 reel/frame not recorded | Purdue Pharma L.P. | Purdue Pharma L.P. | Assignment of Assignor's Interest |
| Jan 26, 2012 reel/frame not recorded | Purdue Pharma L.P. | The P.F. Laboratories, Inc. | Assignment of Assignor's Interest |
| Jan 26, 2012 reel/frame not recorded | Purdue Pharma L.P. | Purdue Pharmaceuticals L.P. | Assignment of Assignor's Interest |
| Jan 26, 2012 reel/frame not recorded | Purdue Pharma L.P. | Rhodes Technologies | Assignment of Assignor's Interest |
| Apr 19, 2019 Reel 48936, frame 93 | The P.F. Laboratories, Inc.; Purdue Pharma Technologies, Inc. | Purdue Pharma L.P. | 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
Jun 2028
Term ends Jun 16, 2028. No further fees fall due before then
Note
The 840 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
56
later US patents cite this one
That is top 25% 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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.