Lapsed Feb 12, 2025 on the fee record · High confidence
20-year base term ends Sep 22, 2029
Third maintenance fee unpaid; grace period ended.
Held by Grace Engineering Corp.
Filed Sep 22, 2009 as application 12/564,508 · Granted Feb 12, 2013
Base term, 20 years from filing, plus 734 days of patent term adjustment (USPTO delay)
Today
Lapsed Feb 12, 2025
2009
2031
Clock starts
Sep 22, 2009
Sep 22, 2009
No longer in force
Feb 12, 2025
Feb 12, 2025
Granted
Feb 12, 2013
Feb 12, 2013
Term would have run to
Sep 26, 2031
Sep 26, 2031
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
734
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
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.
5
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 Sep 26, 2031: its 20-year base term plus 734 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 Sep 22, 2009, when this application, 12/564,508, was filed | Sep 22, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +734 days, USPTO patent term adjustment record | Sep 26, 2031 | 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 | 2 of 3 maintenance fees paid | lapsed Feb 12, 2025 | High confidence |
| Computed term end | The steps above, in order | Feb 12, 2025 | High confidence |
This family
| US 8,371,283 | this patent Feb 2025 | Feb 2025 |
| Application 12/646,073 | Abandoned not computed | not computed |
| US 8,424,511 | In force Aug 2030 | Aug 2030 |
| US 8,784,628 | Lapsed on the fee record Jul 2026 | Jul 2026 |
| US 8,651,097 | In force Sep 2029 | Sep 2029 |
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 |
|---|---|---|---|
| Sep 22, 2009 Reel 23267, frame 122 | Grace, Nathaniel E.; Grace, Louis, JR.; Stokes, Kyle B. | Grace Engineering Corp. | Assignment of Assignor's Interest |
| Apr 12, 2018 Reel 45517, frame 842 | Grace Engineering Corp.; G5 Outdoors, L.L.C.; Grace Properties of Memphis, L.L.C. | The Huntington National Bank | Security Interest |
| Aug 8, 2025 Reel 71971, frame 29 | The Huntington National Bank | Grace Engineering Corp.; G5 Outdoors, L.L.C.; Grace Properties of Memphis, L.L.C. | Release of Security Interest |
| Aug 8, 2025 reel/frame not recorded | The Huntington National Bank | Grace Engineering Corp. | Release of Security Interest |
| Aug 8, 2025 reel/frame not recorded | The Huntington National Bank | G5 Outdoors, L.L.C. | Release of Security Interest |
| Aug 8, 2025 reel/frame not recorded | The Huntington National Bank | Grace Properties of Memphis, L.L.C. | Release of Security 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
Note
The 734 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
39
later US patents cite this one
That is top 25% of utility patents granted in 2013 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.