Also listed on Surmodics SMP, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Jul 8, 2031 · High confidence
20-year base term ends Jun 29, 2031
Held by Evonik Operations GmbH
Filed Jun 29, 2011 as application 13/171,927 · Granted Jul 16, 2013
Base term plus 9 days of patent term adjustment (USPTO delay)
Today
2011
2031
Clock starts
Jun 29, 2011
Jun 29, 2011
Term ends
Jul 8, 2031
Jul 8, 2031
Granted
Jul 16, 2013
Jul 16, 2013
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
9
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.
This patent's term runs 9 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 Jun 29, 2011, when this application, 13/171,927, was filed | Jun 29, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +9 days, USPTO patent term adjustment record | Jul 8, 2031 | 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 | Jul 8, 2031 | High confidence |
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 21, 2011 Reel 26939, frame 830 | Hudson, Michael E. | Surmodics Pharmaceuticals, Inc. | Assignment of Assignor's Interest |
| May 21, 2013 Reel 30460, frame 496 | Surmodics Pharmaceuticals, Inc. | Surmodics SMP, Inc. | Change of Name |
| May 22, 2013 Reel 30467, frame 314 | Surmodics SMP, Inc. | Evonik Corporation | Assignment of Assignor's Interest |
| May 2, 2025 Reel 71152, frame 488 | Evonik Corporation | Evonik Operations GmbH | 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
Jul 2031
Term ends Jul 8, 2031. No further fees fall due before then
Note
The 9 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
1
later US patent cites this one
That is below the median of utility patents granted in 2013 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.