Also listed on Peking University Founder R&D Center, an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Dec 23, 2031 · Low confidence
20-year base term ends Dec 23, 2031
Grace period ended Nov 4, 2026 · no payment on record as of the Nov 10, 2026 fee file · lapse expected
Held by New Founder Holdings Development Limited Liability Company, Beijing Founder Electronics Co., Ltd. and Peking University Founder R&D Center
Filed Dec 19, 2013 as application 13/997,119 · Granted Nov 4, 2014
Base term, 20 years from filing
Today
2011
2031
Clock starts
Dec 23, 2011
Dec 23, 2011
Term ends
Dec 23, 2031
Dec 23, 2031
Granted
Nov 4, 2014
Nov 4, 2014
base term
fee events
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
None
Term adjustment
No prosecution delay on this record.
None
Terminal disclaimer
No disclaimer on this record.
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.
2
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 is its 20-year base term, with no adjustment for prosecution delay. 2 of 3 maintenance fees are paid so far. Confidence: Low: the grace period for its third maintenance fee ended Nov 4, 2026 with no payment on record. 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 23, 2011, when application PCT/CN2011/084580, the earliest non-provisional in its chain, was filed (this one was filed Dec 19, 2013) | Dec 23, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | 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 | The grace period ended with no payment on record in the fee file | grace period ended Nov 4, 2026 | Low confidence |
| Computed term end | The steps above, in order | Dec 23, 2031 | Low confidence |
This family
| US 8,876,250 | this patent Dec 2031 | Dec 2031 |
1 of 2 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 |
|---|---|---|---|
| Aug 23, 2013 reel/frame not recorded | Bai, Yuying; Li, Haifeng; Ma, Yanman | Peking University Founder Group Co., Ltd. | Assignment of Assignor's Interest |
| Aug 23, 2013 reel/frame not recorded | Bai, Yuying; Li, Haifeng; Ma, Yanman | Beijing Founder Electronics Co., Ltd. | Assignment of Assignor's Interest |
| Aug 23, 2013 reel/frame not recorded | Bai, Yuying; Li, Haifeng; Ma, Yanman | Peking University Founder R&D Center | Assignment of Assignor's Interest |
| Aug 23, 2013 Reel 31069, frame 152 | Li, Haifeng; Ma, Yanman; Bai, Yuying | Peking University Founder Group Co., Ltd.; Beijing Founder Electronics Co., Ltd.; Peking University Founder R&D Center | Assignment of Assignor's Interest |
| Mar 1, 2023 reel/frame not recorded | Beijing Founder Electronics Co., Ltd.; Peking University Founder Group Co., Ltd.; Peking University Founder R&D Center | New Founder Holdings Development Limited Liability Company | Assignment of Assignor's Interest |
| Mar 1, 2023 reel/frame not recorded | Beijing Founder Electronics Co., Ltd.; Peking University Founder Group Co., Ltd.; Peking University Founder R&D Center | Beijing Founder Electronics Co., Ltd. | Assignment of Assignor's Interest |
| Mar 1, 2023 reel/frame not recorded | Beijing Founder Electronics Co., Ltd.; Peking University Founder Group Co., Ltd.; Peking University Founder R&D Center | Peking University Founder R&D Center | Assignment of Assignor's Interest |
| Mar 1, 2023 Reel 62848, frame 413 | Peking University Founder Group Co., Ltd.; Beijing Founder Electronics Co., Ltd.; Peking University Founder R&D Center | New Founder Holdings Development Limited Liability Company; Beijing Founder Electronics Co., Ltd.; Peking University Founder R&D Center | 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
Nov 4
Grace period ended Nov 4, 2026 with no payment on record. The term ends early once USPTO posts the lapse
Dec 2031
Term ends Dec 23, 2031.
Citations
0
later US patents cite this one
That is below the median 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.