Term ended Mar 18, 2026 · High confidence
20-year base term ended Dec 28, 2025
Held by Fluke Corporation
Filed Nov 22, 2010 as application 12/952,101 · Granted Feb 26, 2013
Base term plus 80 days of patent term adjustment (USPTO delay)
Today
Term ended Mar 18, 2026
2005
2026
Clock starts
Dec 28, 2005
Dec 28, 2005
Term ended
Mar 18, 2026
Mar 18, 2026
Granted
Feb 26, 2013
Feb 26, 2013
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
80
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 7,873,490, to Mar 18, 2026. The term already ends on or before that date, so the cap shortened nothing.
3 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.
8
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 80 days past its 20-year base term on prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. All three maintenance fees were paid, so no fee lapse ended it. 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 Dec 28, 2005, when application 11/321,294, the earliest non-provisional in its chain, was filed (this one was filed Nov 22, 2010) | Dec 28, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +80 days, USPTO patent term adjustment record | Mar 18, 2026 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 7,873,490) | resolves to Mar 18, 2026, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 3 of 3 maintenance fees paid | term ended | High confidence |
| Computed term end | The steps above, in order | Mar 18, 2026 | High confidence |
This family
| US 7,873,490 | In force Jan 2029 | Jan 2029 |
| Application PCT/US2006/048836 | PCT application no patent term | no patent term |
| US 8,386,179 | this patent Mar 2026 | Mar 2026 |
| Application 13/733,867 | Abandoned not computed | not computed |
| US 9,697,644 | In force Sep 2027 | Sep 2027 |
| US 10,692,278 | Term ended Oct 2026 | Oct 2026 |
| US 11,748,946 | In force Mar 2027 | Mar 2027 |
| Application 18/458,773 | Abandoned 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 |
|---|---|---|---|
| Feb 18, 2011 Reel 25835, frame 828 | Macdonald, Willard S. | Solmetric Corporation | Assignment of Assignor's Interest |
| Jan 17, 2013 Reel 29652, frame 936 | Macdonald, Willard S. | Solmetric Corporation | Assignment of Assignor's Interest |
| Feb 7, 2018 Reel 44860, frame 424 | Vivint Solar, Inc. | Goldman Sachs Lending Partners LLC, as Collateral Agent | Security Interest |
| Dec 18, 2019 Reel 51367, frame 844 | Goldman Sachs Lending Partners LLC, as Collateral Agent | Vivint Solar, Inc. | Release of Security Interest in Intellectual Property at Reel/Frame No. 44860/0424 |
| Mar 10, 2022 Reel 59229, frame 453 | Solmetric Corporation | Sunrun Inc. | Assignment of Assignor's Interest |
| Jun 1, 2023 Reel 64258, frame 325 | Sunrun Inc. | Solmetric Corporation | Assignment of Assignor's Interest |
| Dec 15, 2023 Reel 65881, frame 308 | Solmetric | Fluke Corporation | 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 80 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 7,873,490, ends no earlier than this term, so it caps nothing.
Citations
20
later US patents cite this one
That is above the median 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.