Lapsed Dec 1, 2023 on the fee record · High confidence
20-year base term ends Dec 10, 2032
Second maintenance fee unpaid; grace period ended.
Held by Linfo IP LLC
Filed Mar 12, 2013 as application 13/794,800 · Granted Dec 1, 2015
Base term, 20 years from filing, plus 331 days of patent term adjustment (USPTO delay)
Today
Lapsed Dec 1, 2023
2012
2033
Clock starts
Dec 10, 2012
Dec 10, 2012
No longer in force
Dec 1, 2023
Dec 1, 2023
Granted
Dec 1, 2015
Dec 1, 2015
Term would have run to
Nov 6, 2033
Nov 6, 2033
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
331
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
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.
2
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 Nov 6, 2033: its 20-year base term plus 331 days of term adjustment for prosecution delay. 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 10, 2012, when application 13/709,827, the earliest non-provisional in its chain, was filed (this one was filed Mar 12, 2013) | Dec 10, 2032 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +331 days, USPTO patent term adjustment record | Nov 6, 2033 | 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 | 1 of 3 maintenance fees paid | lapsed Dec 1, 2023 | High confidence |
| Computed term end | The steps above, in order | Dec 1, 2023 | High confidence |
This family
| US 9,092,428 | In force Oct 2033 | Oct 2033 |
| US 9,201,868 | this patent Dec 2023 | Dec 2023 |
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 9, 2021 Reel 57128, frame 500 | Zhang, Chizong; Zhang, Guangsheng | Linfo IP LLC | 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 331 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
18
later US patents cite this one
That is top 25% of utility patents granted in 2015 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.