Term ends Jun 2, 2029 · Medium confidence
20-year base term ends Mar 19, 2028
Why Medium: A parent in the chain could not be resolved.
Held by Sunlighten, LLC
Filed Apr 20, 2009 as application 12/426,762 · Granted Mar 18, 2014
Base term plus 440 days of patent term adjustment (USPTO delay)
Today
2008
2029
Clock starts
Mar 19, 2008
Mar 19, 2008
Term ends
Jun 2, 2029
Jun 2, 2029
Granted
Mar 18, 2014
Mar 18, 2014
base term
patent term adjustment
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
440
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
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 440 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 Mar 19, 2008, when application 12/051,521, the earliest non-provisional in its chain, was filed (this one was filed Apr 20, 2009); a parent in its chain could not be resolved (the next row) | Mar 19, 2028 | 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 | +440 days, USPTO patent term adjustment record | Jun 2, 2029 | 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Jun 2, 2029 | Medium confidence |
This family
| US 8,588,593 | In force Apr 2031 | Apr 2031 |
| US 8,676,044 | this patent Jun 2029 | Jun 2029 |
| US 9,744,098 | In force Dec 2029 | Dec 2029 |
| US 10,376,442 | In force Apr 2028 | Apr 2028 |
| US 10,874,586 | In force Mar 2028 | Mar 2028 |
| US 11,419,787 | In force Mar 2028 | Mar 2028 |
| US 11,690,782 | In force Mar 2028 | Mar 2028 |
7 of 8 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 |
|---|---|---|---|
| Oct 6, 2009 Reel 23332, frame 672 | O'keeffe, James T.; Zack, Aaron Michael; Ku, Martin C.; Kuklenski, Ian Richard; Murray, Steven J. | Sunlight Saunas, Inc. | Assignment of Assignor's Interest |
| Nov 19, 2015 Reel 37148, frame 66 | Sunlight Saunas, Inc. | Sunlighten, Inc. | Change of Name |
| Jul 25, 2024 Reel 68087, frame 41 | Sunlighten, Inc. | Sunlighten, LLC | Change of Name |
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
Jun 2029
Term ends Jun 2, 2029. No further fees fall due before then
Note
The 440 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
28
later US patents cite this one
That is top 25% of utility patents granted in 2014 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.