Term ends Jul 26, 2027 · High confidence
20-year base term ended Nov 7, 2026
Held by Littelfuse, Inc.
Filed Nov 7, 2006 as application 11/557,209 · Granted Apr 21, 2009
Base term plus 261 days of patent term adjustment (USPTO delay)
Today
2006
2027
Clock starts
Nov 7, 2006
Nov 7, 2006
Term ends
Jul 26, 2027
Jul 26, 2027
Granted
Apr 21, 2009
Apr 21, 2009
base term
patent term adjustment
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
261
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.
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 runs 261 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 Nov 7, 2006, when this application, 11/557,209, was filed | Nov 7, 2026 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +261 days, USPTO patent term adjustment record | Jul 26, 2027 | 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 | Jul 26, 2027 | High confidence |
This family
| US 7,521,922 | this patent Jul 2027 | Jul 2027 |
| Application PCT/US2007/014269 | PCT application no patent term | no patent term |
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 7, 2006 Reel 18491, frame 432 | Stuve, Steven R. | Key Safety Systems, Inc. | Assignment of Assignor's Interest |
| May 16, 2007 Reel 19297, frame 249 | Key Safety Systems, Inc.; KSS Holdings, Inc.; KSS Acquisition Company; Aegis Key Corp.; Breed Automotive Technology, Inc.; Hamlin Incorporated; Key Asian Holdings, Inc.; Key Automotive Accessories, Inc.; Key Automotive of Florida, Inc.; Key Automotive West, Inc.; Key Automotive, LP; Key Cayman GP LLC; Key Electronics of Nevada, Inc.; Hamlin Electronics Limited Partnership; Key International Manufacturing Development Corporation; Key Safety Restraint Systems, Inc.; Key Safety Systems Foreign Holdco, LLC; Key Safety Systems of Texas, Inc. | Citicorp USA, Inc. | Security Agreement |
| Jan 4, 2013 Reel 29565, frame 125 | Citicorp USA, Inc. | UBS AG, Stamford Branch | Assignment and Assumption of Security Interest in Patents |
| Jun 6, 2013 Reel 30572, frame 527 | UBS AG, Stamford Branch | Key Safety Systems, Inc. | Security Interest Release |
| Jun 10, 2014 Reel 33115, frame 636 | Key Safety Systems, Inc. | Littelfuse, Inc. | 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Jul 2027
Term ends Jul 26, 2027. No further fees fall due before then
Note
The 261 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
12
later US patents cite this one
That is above the median of utility patents granted in 2009 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.