Term ended Apr 7, 2021 · High confidence
20-year base term ended Apr 4, 2021
Held by Flir Detection, Inc.
Filed Apr 4, 2001 as application 09/826,209 · Granted Dec 16, 2003
Base term plus 3 days of patent term adjustment (USPTO delay)
Today
Term ended Apr 7, 2021
2001
2026
Clock starts
Apr 4, 2001
Apr 4, 2001
Term ended
Apr 7, 2021
Apr 7, 2021
Granted
Dec 16, 2003
Dec 16, 2003
base term
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
3
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.
105
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 3 days past its 20-year base term on prosecution delay. All three maintenance fees were paid, so no fee lapse ended it. 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 Apr 4, 2001, when this application, 09/826,209, was filed | Apr 4, 2021 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +3 days, USPTO patent term adjustment record | Apr 7, 2021 | 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 | term ended | High confidence |
| Computed term end | The steps above, in order | Apr 7, 2021 | High confidence |
This family
| US 6,662,889 | this patent Apr 2021 | Apr 2021 |
| US 6,769,004 | Term ended Nov 2022 | Nov 2022 |
| US 6,431,296 | Term ended Jan 2019 | Jan 2019 |
| US 6,615,885 | Term ended Oct 2021 | Oct 2021 |
| US 6,668,951 | Term ended Jan 2019 | Jan 2019 |
| US 6,860,206 | Lapsed on the fee record Mar 2017 | Mar 2017 |
| US 7,117,067 | Term ended Dec 2023 | Dec 2023 |
| US 7,363,994 | Lapsed on the fee record Apr 2020 | Apr 2020 |
8 of 105 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 |
|---|---|---|---|
| Feb 12, 2007 Reel 18883, frame 28 | De Fazio, Thomas; Barrett, David S.; Won, Chikyung; Slipichevich, Selma | iRobot Corporation | Assignment of Assignor's Interest |
| Apr 6, 2016 Reel 38365, frame 900 | iRobot Defense Holdings, Inc.; Endeavor Robotic Intermediate Holdings, Inc. | Pnc Bank, National Association | Security Interest |
| Oct 3, 2016 Reel 40205, frame 1 | iRobot Corporation | iRobot Defense Holdings, Inc. | Assignment of Assignor's Interest |
| Apr 7, 2019 Reel 49837, frame 810 | iRobot Defense Holdings, Inc. | Endeavor Robotics, Inc. | Change of Name |
| May 21, 2019 Reel 49244, frame 515 | Endeavor Robotics, Inc. | Flir Detection, 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.
What's changing
Note
The 3 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
307
later US patents cite this one
That is top 5% of utility patents granted in 2003 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.