Term ends no later than May 14, 2031 · Medium confidence
20-year base term ends Nov 17, 2029
In force on USPTO's status record and by its fee record. A terminal disclaimer on file may shorten this term, possibly to a date already past; its reference document is unresolved, so the date above is an upper bound and no earlier date is guessed.
Held by Varian Medical Systems, Inc.
Filed Jan 6, 2022 as application 17/570,305 · Granted Jun 3, 2025
Base term plus 543 days of patent term adjustment (USPTO delay)
Today
2009
2031
Clock starts
Nov 17, 2009
Nov 17, 2009
Ends no later than
May 14, 2031
May 14, 2031
Granted
Jun 3, 2025
Jun 3, 2025
base term
patent term adjustment
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
543
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Unresolved
Terminal disclaimer
On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.
0 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.
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 543 days past its 20-year base term on prosecution delay. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. 0 of 1 maintenance fees are 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 Nov 17, 2009, when application 12/620,002, the earliest non-provisional in its chain, was filed (this one was filed Jan 6, 2022) | Nov 17, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +543 days, USPTO patent term adjustment record | May 14, 2031 | High confidence |
| Terminal disclaimer cap | Disclaimer on file (approved), reference document not resolved | no cap applied, and none guessed | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 0 of 1 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | no later than May 14, 2031 | Medium confidence |
This family
| US 8,414,570 | In force Nov 2031 | Nov 2031 |
| US 8,551,083 | Lapsed on the fee record Oct 2025 | Oct 2025 |
| US 9,993,294 | Lapsed on the fee record Jun 2026 | Jun 2026 |
| Application 13/020,483 | Abandoned not computed | not computed |
| US 9,968,399 | Lapsed on the fee record May 2026 | May 2026 |
| US 11,253,316 | Lapsed on the fee record Feb 2026 | Feb 2026 |
| US 12,318,134 | this patent no later than May 2031 | no later than May 2031 |
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 |
|---|---|---|---|
| Mar 7, 2025 Reel 70436, frame 610 | Turner, Paul F.; Youd, Thomas L.; Hamilton, Brianne | BSD Medical Corporation | Assignment of Assignor's Interest |
| Mar 7, 2025 Reel 70446, frame 466 | BSD Medical Corporation | Perseon Corporation | Change of Name |
| Mar 7, 2025 Reel 70437, frame 195 | Perseon Corporation | Endocare, Inc. | Assignment of Assignor's Interest |
| Mar 7, 2025 Reel 70440, frame 290 | Endocare, Inc. | Varian Medical Systems, 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 2031
Term ends no later than May 14, 2031. Maintenance fees still fall due before then
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Note
The 543 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Open question
A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than May 14, 2031. We will not guess the cap.
Citations
0
later US patents cite this one
Fewer than half of the utility patents granted in 2025 in our data have been cited yet, so we show the count and do not rank on it.
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
This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. 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.