Lapsed Jan 20, 2023 on the fee record · High confidence
20-year base term ends Feb 1, 2030
Second maintenance fee unpaid; grace period ended.
Held by Johns Manville
Filed Nov 15, 2011 as application 13/296,768 · Granted Jan 20, 2015
Base term, 20 years from filing, plus 78 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
Lapsed Jan 20, 2023
2010
2030
Clock starts
Feb 1, 2010
Feb 1, 2010
No longer in force
Jan 20, 2023
Jan 20, 2023
Granted
Jan 20, 2015
Jan 20, 2015
Term would have run to
Jan 7, 2027
Jan 7, 2027
base term
after the term ends
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
78
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 8,080,224.
1 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. This counts the ones the record shows paid.
7
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 Jan 7, 2027: its 20-year base term plus 78 days of term adjustment for prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 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 Feb 1, 2010, when application 12/697,968, the earliest non-provisional in its chain, was filed (this one was filed Nov 15, 2011) | Feb 1, 2030 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +78 days, USPTO patent term adjustment record | Apr 20, 2030 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,080,224) | capped to Jan 7, 2027 | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 2 maintenance fees paid | lapsed Jan 20, 2023 | High confidence |
| Computed term end | The steps above, in order | Jan 20, 2023 | High confidence |
This family
| US 8,680,224 | In force Jul 2031 | Jul 2031 |
| US 8,809,477 | In force Apr 2030 | Apr 2030 |
| US 8,937,025 | this patent Jan 2023 | Jan 2023 |
| US 9,587,103 | In force Feb 2030 | Feb 2030 |
| US 9,493,617 | In force no later than Feb 2030 | no later than Feb 2030 |
| US 9,683,085 | In force Feb 2030 | Feb 2030 |
| US 10,087,350 | In force Feb 2030 | Feb 2030 |
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 |
|---|---|---|---|
| Nov 15, 2011 Reel 27229, frame 980 | Zhang, Mingfu; Asrar, Jawed; Guo, Zhihua | Johns Manville | 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 78 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 8,080,224.
Citations
1
later US patent cites this one
That is below the median 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.