Term ends May 14, 2033 · High confidence
20-year base term ends Aug 12, 2031
Held by Fenwal, Inc.
Filed Aug 12, 2011 as application 13/209,161 · Granted Oct 4, 2022
Base term plus 641 days of patent term adjustment (USPTO delay)
Today
2011
2033
Clock starts
Aug 12, 2011
Aug 12, 2011
Term ends
May 14, 2033
May 14, 2033
Granted
Oct 4, 2022
Oct 4, 2022
base term
patent term adjustment
fee events
Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
641
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
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.
7
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 641 days past its 20-year base term on prosecution delay. 1 of 2 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 Aug 12, 2011, when this application, 13/209,161, was filed | Aug 12, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +641 days, USPTO patent term adjustment record | May 14, 2033 | 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 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | May 14, 2033 | High confidence |
This family
| US 11,462,321 | this patent May 2033 | May 2033 |
| US 10,431,335 | In force Sep 2033 | Sep 2033 |
| US 9,727,696 | In force Aug 2031 | Aug 2031 |
| US 11,393,583 | In force Jan 2035 | Jan 2035 |
| US 11,901,069 | In force Aug 2031 | Aug 2031 |
| US 11,676,715 | In force Sep 2031 | Sep 2031 |
| Application 18/196,307 | Pending not computed | not computed |
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 18, 2011 Reel 27255, frame 340 | Case, Brian C.; Prendergast, Jonathan; Barry, John W., JR.; Min, Kyungyoon; Cork, William H.; Calhoun, Daryl Richard; Larson, Christine M. | Fenwal, Inc. | Assignment of Assignor's Interest |
| Sep 12, 2017 Reel 43564, frame 347 | Bronersky, Robert | Fenwal, 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
May 2033
Term ends May 14, 2033. Maintenance fees still fall due before then
Note
The 641 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
30
later US patents cite this one
That is top 5% of utility patents granted in 2022 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.