Lapsed Feb 22, 2026 on the fee record · Medium confidence
20-year base term ends Nov 17, 2029
Why Medium: The disclaimer's references carry disclaimers of their own not yet read (US 8,551,083), so the cap could be lower.
First maintenance fee unpaid; grace period ended.
Held by Varian Medical Systems, Inc.
Filed May 14, 2018 as application 15/979,177 · Granted Feb 22, 2022
Base term, 20 years from filing, plus 781 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
Lapsed Feb 22, 2026
2009
2031
Clock starts
Nov 17, 2009
Nov 17, 2009
No longer in force
Feb 22, 2026
Feb 22, 2026
Granted
Feb 22, 2022
Feb 22, 2022
Term would have run to
Oct 28, 2031
Oct 28, 2031
base term
patent term adjustment
after the term ends
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
781
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 8,414,570, US 8,551,083, US 9,968,399.
0 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.
Its term would have run to Oct 28, 2031: its 20-year base term plus 781 days of term adjustment for prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 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 May 14, 2018) | Nov 17, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +781 days, USPTO patent term adjustment record | Jan 7, 2032 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,414,570, US 8,551,083, US 9,968,399) | capped to Oct 28, 2031 | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 0 of 2 maintenance fees paid | lapsed Feb 22, 2026 | High confidence |
| Computed term end | The steps above, in order | Feb 22, 2026 | 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 | this patent Feb 2026 | Feb 2026 |
| US 12,318,134 | In force 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 15, 2019 Reel 48609, frame 886 | Perseon Corporation | Endocare, Inc. | Assignment of Assignor's Interest |
| Jul 16, 2019 Reel 49760, frame 263 | Perseon Corporation | Endocare, Inc. | Assignment of Assignor's Interest |
| Mar 24, 2021 Reel 56940, frame 233 | 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.
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Alerts on its grants, lapses and transfers.
What's changing
Note
The 781 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 8,414,570, US 8,551,083, US 9,968,399.
Citations
1
later US patent cites this one
That is below the median 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.