Term ended May 23, 2023 · High confidence
20-year base term ended Oct 1, 2021
Filed Oct 1, 2001 as application 09/968,432 · Granted Mar 20, 2007
Base term plus 599 days of patent term adjustment (USPTO delay)
Today
Term ended May 23, 2023
2001
2026
Clock starts
Oct 1, 2001
Oct 1, 2001
Term ended
May 23, 2023
May 23, 2023
Granted
Mar 20, 2007
Mar 20, 2007
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
599
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.
6
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 599 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 Oct 1, 2001, when this application, 09/968,432, was filed | Oct 1, 2021 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +599 days, USPTO patent term adjustment record | May 23, 2023 | 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 | May 23, 2023 | High confidence |
This family
| US 7,194,535 | this patent May 2023 | May 2023 |
| Application PCT/US2002/030930 | PCT application no patent term | no patent term |
| US 8,914,432 | In force Dec 2029 | Dec 2029 |
| US 7,516,216 | Term ended Jan 2023 | Jan 2023 |
| US 7,496,664 | Term ended Jan 2022 | Jan 2022 |
| US 9,191,301 | Term ended Oct 2021 | Oct 2021 |
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 |
|---|---|---|---|
| Jan 18, 2002 Reel 12498, frame 838 | Hannel, Clifford L.; Schafer, Douglas E.; Ginsberg, Errol; Pepper, Gerald R. | Ixia Communications | Assignment of Assignor's Interest |
| Jan 25, 2013 Reel 29698, frame 60 | Ixia | Bank of America, N.A., as Administrative Agent | Security Agreement |
| May 3, 2013 Reel 30347, frame 435 | Ixia Communications | Ixia | Change of Name |
| Feb 2, 2015 Reel 34870, frame 598 | Bank of America, N.A., Resigning Administrative Agent | Silicon Valley Bank, as Successor Administrative Agent | Notice of Substitution of Administrative Agent |
| Apr 26, 2017 Reel 42335, frame 465 | Silicon Valley Bank, as Successor Administrative Agent | Ixia | Release of Security Interest |
| Oct 18, 2017 Reel 44222, frame 695 | Ixia | Keysight Technologies Singapore (Holdings) Pte. Ltd. | Assignment of Assignor's Interest |
| Oct 19, 2018 Reel 48225, frame 65 | Keysight Technologies Singapore (Holdings) Pte. Ltd. | Keysight Technologies Singapore (Sales) Pte. Ltd. | 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
Note
The 599 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
59
later US patents cite this one
That is top 25% of utility patents granted in 2007 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.