Lapsed Dec 6, 2023 on the fee record · High confidence
20-year base term ends Sep 5, 2027
Third maintenance fee unpaid; grace period ended.
Held by Spirent Communications, Inc.
Filed Jul 27, 2010 as application 12/844,405 · Granted Dec 6, 2011
Base term, 20 years from filing
Today
Lapsed Dec 6, 2023
2007
2027
Clock starts
Sep 5, 2007
Sep 5, 2007
No longer in force
Dec 6, 2023
Dec 6, 2023
Granted
Dec 6, 2011
Dec 6, 2011
Term would have run to
Sep 5, 2027
Sep 5, 2027
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
None
Term adjustment
No prosecution delay on this record.
None
Terminal disclaimer
No disclaimer on this record.
2 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.
Its term would have run to Sep 5, 2027: its 20-year base term, with no 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 Sep 5, 2007, when application 11/850,164, the earliest non-provisional in its chain, was filed (this one was filed Jul 27, 2010) | Sep 5, 2027 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High 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 | 2 of 3 maintenance fees paid | lapsed Dec 6, 2023 | High confidence |
| Computed term end | The steps above, in order | Dec 6, 2023 | High confidence |
This family
| US 7,774,637 | In force Aug 2028 | Aug 2028 |
| US 8,074,097 | this patent Dec 2023 | Dec 2023 |
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 5, 2010 Reel 25092, frame 332 | Beddoe, Marshall A.; Maufer, Thomas A. | Mu Security, Inc. | Assignment of Assignor's Interest |
| Oct 5, 2010 Reel 25092, frame 529 | Mu Security, Inc. | Mu Dynamics, Inc. | Change of Name |
| Jun 13, 2014 Reel 33099, frame 185 | Mu Dynamics, Inc. | Spirent Communications, 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.
Citations
15
later US patents cite this one
That is above 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.