Lapsed Feb 21, 2020 on the fee record · High confidence
20-year base term ended Mar 24, 2025
Second maintenance fee unpaid; grace period ended.
Filed Dec 9, 2005 as application 11/298,106 · Granted Feb 21, 2012
Base term, 20 years from filing, plus 1400 days of patent term adjustment (USPTO delay)
Today
Lapsed Feb 21, 2020
2005
2029
Clock starts
Mar 24, 2005
Mar 24, 2005
No longer in force
Feb 21, 2020
Feb 21, 2020
Granted
Feb 21, 2012
Feb 21, 2012
Term would have run to
Jan 22, 2029
Jan 22, 2029
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
1,400
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
1 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.
4
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
Its term would have run to Jan 22, 2029: its 20-year base term plus 1400 days of term adjustment for prosecution delay. 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 24, 2005, when application 11/089,845, the earliest non-provisional in its chain, was filed (this one was filed Dec 9, 2005) | Mar 24, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +1400 days, USPTO patent term adjustment record | Jan 22, 2029 | 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 | 1 of 3 maintenance fees paid | lapsed Feb 21, 2020 | High confidence |
| Computed term end | The steps above, in order | Feb 21, 2020 | High confidence |
This family
| US 7,414,975 | In force Jan 2027 | Jan 2027 |
| US 8,121,148 | this patent Feb 2020 | Feb 2020 |
| US 7,827,295 | Term ended Aug 2025 | Aug 2025 |
| US 8,649,395 | Term ended Mar 2025 | Mar 2025 |
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 4, 2007 Reel 18710, frame 529 | Olderdissen, Jan Ra | Ixia | Assignment of Assignor's Interest |
| Jan 25, 2013 Reel 29698, frame 60 | Ixia | Bank of America, N.A., as Administrative Agent | Security Agreement |
| 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 1400 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
27
later US patents cite this one
That is top 25% of utility patents granted in 2012 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.