Lapsed Apr 11, 2025 on the fee record · Low confidence
20-year base term ends Mar 20, 2028
Second maintenance fee unpaid; grace period ended.
Filed Mar 26, 2013 as application 13/850,976 · Granted Apr 11, 2017
Base term, 20 years from filing, plus 722 days of patent term adjustment (USPTO delay)
Today
Lapsed Apr 11, 2025
2008
2030
Clock starts
Mar 20, 2008
Mar 20, 2008
No longer in force
Apr 11, 2025
Apr 11, 2025
Granted
Apr 11, 2017
Apr 11, 2017
Term would have run to
Mar 12, 2030
Mar 12, 2030
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
722
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.
1 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.
Its term would have run to Mar 12, 2030: its 20-year base term plus 722 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: Low. 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 20, 2008, when application 12/052,476, the earliest non-provisional in its chain, was filed (this one was filed Mar 26, 2013); a parent in its chain could not be resolved (the next row) | Mar 20, 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 | +722 days, USPTO patent term adjustment record | Mar 12, 2030 | 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 | 1 of 3 maintenance fees paid | lapsed Apr 11, 2025 | High confidence |
| Computed term end | The steps above, in order | Apr 11, 2025 | Low confidence |
This family
| US 8,912,429 | In force Dec 2030 | Dec 2030 |
| Application PCT/US2009/035486 | PCT application no patent term | no patent term |
| Application 12/566,555 | Abandoned not computed | not computed |
| Application 13/085,274 | Abandoned not computed | not computed |
| Application 13/087,724 | Abandoned not computed | not computed |
| US 9,620,660 | this patent Apr 2025 | Apr 2025 |
| US 10,158,031 | In force Oct 2029 | Oct 2029 |
| US 10,056,521 | In force Mar 2028 | Mar 2028 |
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 27, 2014 Reel 32127, frame 428 | Miasolé | Hanergy Holding Group Ltd. | Confirmatory Assignment of Patent Rights |
| Jan 30, 2015 Reel 34857, frame 281 | Hanergy Holding Group Ltd. | Apollo Precision (Fujian) Limited | Assignment of Assignor's Interest |
| Mar 4, 2016 Reel 37895, frame 779 | Apollo Precision (Fujian) Limited | Beijing Apollo Ding Rong Solar Technology Co., Ltd. | Assignment of Assignor's Interest |
| Mar 22, 2016 Reel 38213, frame 238 | Apollo Precision (Fujian) Limited | Beijing Apollo Ding Rong Solar Technology Co., Ltd. | Corrective Assignment to Correct the Incorrect Appl. No. 14/525,282 Previously Recorded at Reel: 037895 Frame: 0779. Assignor(S) Hereby Confirms the Assignment. |
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.
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 722 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 Apr 11, 2025. We will not guess the cap.
Citations
8
later US patents cite this one
That is above the median of utility patents granted in 2017 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.