Term ends Nov 25, 2026 · Medium confidence
20-year base term ended Apr 27, 2026
Why Medium: A parent in the chain could not be resolved.
Held by Zoll Circulation, Inc.
Filed Dec 23, 2018 as application 16/231,551 · Granted Apr 26, 2022
Base term plus 212 days of patent term adjustment (USPTO delay)
Today
2006
2026
Clock starts
Apr 27, 2006
Apr 27, 2006
Term ends
Nov 25, 2026
Nov 25, 2026
Granted
Apr 26, 2022
Apr 26, 2022
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
212
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 1
Maintenance fees paid
One maintenance fee can end this term early, the one due 3.5 years from grant; the next one's grace period runs past the term end. This counts it if the record shows it paid.
5
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 212 days past its 20-year base term on prosecution delay. 1 of 1 maintenance fees is paid so far. Confidence: Medium. 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 27, 2006, when application 11/413,564, the earliest non-provisional in its chain, was filed (this one was filed Dec 23, 2018); a parent in its chain could not be resolved (the next row) | Apr 27, 2026 | High confidence |
| Continuity chain | A parent in the chain could not be resolved | dated from this application's own claim | Medium confidence |
| Patent term adjustment | +212 days, USPTO patent term adjustment record | Nov 25, 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 | 1 of 1 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Nov 25, 2026 | Medium confidence |
This family
| US 7,806,915 | In force Apr 2029 | Apr 2029 |
| US 8,808,344 | Lapsed on the fee record Aug 2022 | Aug 2022 |
| US 11,311,414 | this patent Nov 2026 | Nov 2026 |
3 of 5 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 |
|---|---|---|---|
| Nov 20, 2019 Reel 51060, frame 822 | Radiant Medical, Inc. | Bay City Capital Fund IV L.P. | Security Interest |
| Nov 20, 2019 Reel 51060, frame 542 | Radiant Medical, Inc. | Horizon Technology Funding Company LLC | Security Interest |
| Nov 20, 2019 Reel 51060, frame 649 | Horizon Technology Funding Company LLC | Bay City Capital Fund IV L.P. | Assignment of Assignor's Interest |
| Nov 20, 2019 Reel 51060, frame 973 | Radiant Medical, Inc.; Bay City Capital Fund IV L.P. | Zoll Circulation, Inc. | Assignment of Assignor's Interest |
| Nov 20, 2019 Reel 51061, frame 140 | Scott, David J.; Brian, Ben F.; Wright, Lloyd F.; Chin, Leo A.; Hollmen, Edward W.; Seegars, Daniel W.; Logan, Mark A. | Radiant Medical, 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.
What's changing
Nov 2026
Term ends Nov 25, 2026. No further fees fall due before then
Note
The 212 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
8
later US patents cite this one
That is top 25% 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.