Lapsed Feb 3, 2023 on the fee record · High confidence
20-year base term ends Aug 30, 2027
Second maintenance fee unpaid; grace period ended.
Filed Jun 16, 2011 as application 13/162,575 · Granted Feb 3, 2015
Base term, 20 years from filing, plus 402 days of patent term adjustment (USPTO delay)
Today
Lapsed Feb 3, 2023
2007
2028
Clock starts
Aug 30, 2007
Aug 30, 2007
No longer in force
Feb 3, 2023
Feb 3, 2023
Granted
Feb 3, 2015
Feb 3, 2015
Term would have run to
Oct 5, 2028
Oct 5, 2028
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
402
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.
24
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 Oct 5, 2028: its 20-year base term plus 402 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 Aug 30, 2007, when application 11/847,986, the earliest non-provisional in its chain, was filed (this one was filed Jun 16, 2011) | Aug 30, 2027 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +402 days, USPTO patent term adjustment record | Oct 5, 2028 | 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 3, 2023 | High confidence |
| Computed term end | The steps above, in order | Feb 3, 2023 | High confidence |
This family
| US 7,761,626 | Lapsed on the fee record Jul 2022 | Jul 2022 |
| US 7,761,623 | Lapsed on the fee record Jul 2022 | Jul 2022 |
| US 8,806,116 | In force Jul 2030 | Jul 2030 |
| US 8,370,547 | Lapsed on the fee record Feb 2025 | Feb 2025 |
| US 8,370,548 | Lapsed on the fee record Feb 2021 | Feb 2021 |
| US 8,949,555 | this patent Feb 2023 | Feb 2023 |
| US 8,341,300 | Lapsed on the fee record Dec 2024 | Dec 2024 |
| US 8,689,042 | In force Aug 2027 | Aug 2027 |
8 of 24 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 |
|---|---|---|---|
| Jan 17, 2013 Reel 29644, frame 797 | Karamcheti, Vijay; Mondal, Shibabrata; Kumar, Ajith | Virident Systems, Inc. | Assignment of Assignor's Interest |
| Jan 30, 2019 Reel 48196, frame 580 | Virident Systems, Inc. | Virident Systems, LLC | Change of Name |
| Jul 9, 2020 Reel 53180, frame 472 | Virident Systems, LLC | Western Digital Technologies, Inc. | Assignment of Assignor's Interest |
| Sep 29, 2020 Reel 53926, frame 446 | Western Digital Technologies, Inc. | JPMorgan Chase Bank, N.A., as Agent | Security Interest |
| Feb 8, 2022 Reel 58966, frame 321 | Jpmorgan Chase Bank, N.a. | Western Digital Technologies, Inc. | Release of Security Interest at Reel 053926 Frame 0446 |
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 402 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
31
later US patents cite this one
That is top 25% of utility patents granted in 2015 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.