Lapsed Oct 8, 2025 on the fee record · Medium confidence
20-year base term ends Nov 17, 2029
Why Medium: A terminal disclaimer is on file (approved) with no resolved reference, so the term may end earlier.
Third maintenance fee unpaid; grace period ended.
Held by Varian Medical Systems, Inc.
Filed Jan 18, 2010 as application 12/689,195 · Granted Oct 8, 2013
Base term, 20 years from filing, plus 710 days of patent term adjustment (USPTO delay)
Today
Lapsed Oct 8, 2025
2009
2031
Clock starts
Nov 17, 2009
Nov 17, 2009
No longer in force
Oct 8, 2025
Oct 8, 2025
Granted
Oct 8, 2013
Oct 8, 2013
Term would have run to
Oct 28, 2031
Oct 28, 2031
base term
patent term adjustment
after the term ends
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
710
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.
2 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.
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 710 days of term adjustment for prosecution delay. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. 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 18, 2010) | Nov 17, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +710 days, USPTO patent term adjustment record | Oct 28, 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 | 2 of 3 maintenance fees paid | lapsed Oct 8, 2025 | High confidence |
| Computed term end | The steps above, in order | Oct 8, 2025 | Medium confidence |
This family
| US 8,414,570 | In force Nov 2031 | Nov 2031 |
| US 8,551,083 | this patent 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 | 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 |
|---|---|---|---|
| Jan 19, 2010 Reel 23804, frame 563 | Turner, Paul F.; Youd, Thomas L.; Hamilton, Brianne | BSD Medical Corporation | Assignment of Assignor's Interest |
| Apr 6, 2015 Reel 35366, frame 936 | BSD Medical Corporation | Perseon Corporation | Change of Name |
| Sep 14, 2016 Reel 39743, frame 664 | Perseon Corporation | Scion Medicaltechnologies, LLC | Assignment of Assignor's Interest |
| May 31, 2017 Reel 42550, frame 214 | Scion Medical Technologies, LLC | Perseon Corporation | Assignment of Assignor's Interest |
| 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Note
The 710 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 Oct 8, 2025. We will not guess the cap.
Citations
92
later US patents cite this one
That is top 10% 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.