Term ends Sep 19, 2028 · High confidence
20-year base term ends Mar 28, 2027
Held by Esco Group LLC
Filed Mar 28, 2007 as application 11/729,502 · Granted Feb 8, 2011
Base term plus 541 days of patent term adjustment (USPTO delay)
Today
2007
2028
Clock starts
Mar 28, 2007
Mar 28, 2007
Term ends
Sep 19, 2028
Sep 19, 2028
Granted
Feb 8, 2011
Feb 8, 2011
base term
patent term adjustment
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
541
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
3 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.
13
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 runs 541 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 Mar 28, 2007, when this application, 11/729,502, was filed | Mar 28, 2027 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +541 days, USPTO patent term adjustment record | Sep 19, 2028 | 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Sep 19, 2028 | High confidence |
This family
| US 7,882,649 | this patent Sep 2028 | Sep 2028 |
| US 8,122,621 | In force Mar 2027 | Mar 2027 |
| Application 13/369,699 | Abandoned not computed | not computed |
| US 8,689,472 | Lapsed on the fee record Apr 2026 | Apr 2026 |
| Application 13/705,562 | Abandoned not computed | not computed |
| US 8,839,535 | Lapsed on the fee record Sep 2026 | Sep 2026 |
| US 9,493,930 | In force Mar 2027 | Mar 2027 |
| US 9,816,254 | Lapsed on the fee record Nov 2025 | Nov 2025 |
8 of 13 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 |
|---|---|---|---|
| May 16, 2007 Reel 19344, frame 166 | Carpenter, Christopher M.; Conklin, Donald M.; Morris, Ray J.; Bearden, James E.; Durand, Severn D. | Esco Corporation | Assignment of Assignor's Interest |
| Nov 29, 2010 Reel 25406, frame 714 | Esco Corporation | Bank of America, N.A., as Administrative Agent | Notice of Grant of Security Interest in Patents |
| May 9, 2013 Reel 30388, frame 273 | Radzius, Dziugas | Esco Corporation | Assignment of Assignor's Interest |
| Jul 16, 2018 Reel 46551, frame 375 | Bank Of America, N.a. | Esco Corporation | Release of Security Interest |
| Aug 17, 2018 Reel 46848, frame 493 | Esco Corporation; Esco Group LLC | Esco Group LLC | Merger and Change of Name |
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
Sep 2028
Term ends Sep 19, 2028. No further fees fall due before then
Note
The 541 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
67
later US patents cite this one
That is top 10% of utility patents granted in 2011 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.