Term ends Dec 8, 2026 · Medium confidence
20-year base term ends Dec 8, 2026
Why Medium: A parent in the chain could not be resolved.
Filed Feb 19, 2010 as application 12/708,646 · Granted Jul 12, 2011
Base term, 20 years from filing
Today
2006
2026
Clock starts
Dec 8, 2006
Dec 8, 2006
Term ends
Dec 8, 2026
Dec 8, 2026
Granted
Jul 12, 2011
Jul 12, 2011
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.
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.
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. All three maintenance fees are recorded paid; no more fees are due. Confidence: Medium. 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 8, 2006, when application 11/608,381, the earliest non-provisional in its chain, was filed (this one was filed Feb 19, 2010); a parent in its chain could not be resolved (the next row) | Dec 8, 2026 | High confidence |
| Continuity chain | A parent in the chain could not be resolved | dated from this application's own claim | Medium 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Dec 8, 2026 | Medium confidence |
This family
| US 7,975,934 | this patent Dec 2026 | Dec 2026 |
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 |
|---|---|---|---|
| Oct 18, 2011 Reel 27180, frame 960 | Airboss Railway Products, Inc. | Amsted Rail Company, Inc. | Assignment of Assignor's Interest |
| Mar 21, 2014 Reel 32493, frame 933 | Amsted Rail Company, Inc. | Bank of America, N.A., as Administrative Agent | Notice of Grant of Security Interest in Patents |
| Aug 18, 2014 Reel 33552, frame 98 | Young, Hartley F. | Airboss Railway Products Inc. | Assignment of Assignor's Interest |
| Jul 6, 2015 Reel 35983, frame 519 | Amsted Rail Company, Inc. | Rail Product Solutions, Inc. | Assignment of Assignor's Interest |
| Jul 23, 2015 Reel 36180, frame 524 | Rail Product Solutions, Inc. | Bank of America, N.A., as Administrative Agent | Notice of Grant of Security Interest in Patents |
| May 11, 2016 Reel 38685, frame 23 | Rail Product Solutions, Inc. | Rail Product Solutions LLC | Change of Name |
| May 26, 2016 Reel 38726, frame 89 | Rail Product Solutions LLC | Progress Rail Services Corporation | Merger |
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
Dec 2026
Term ends Dec 8, 2026. No further fees fall due before then
Citations
2
later US patents cite this one
That is below the median 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.