Term ended Dec 28, 2021 · High confidence
20-year base term ended Apr 17, 2021
USPTO later recorded it as expired for non-payment on Mar 10, 2025.
Held by Rampart Asset Management, LLC
Filed Feb 26, 2009 as application 12/393,265 · Granted Feb 5, 2013
Base term plus 255 days of patent term adjustment (USPTO delay)
Today
Term ended Dec 28, 2021
2001
2026
Clock starts
Apr 17, 2001
Apr 17, 2001
Term ended
Dec 28, 2021
Dec 28, 2021
Granted
Feb 5, 2013
Feb 5, 2013
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
255
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
2 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. This counts the ones the record shows paid.
7
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 255 days past its 20-year base term on 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 Apr 17, 2001, when application 09/837,307, the earliest non-provisional in its chain, was filed (this one was filed Feb 26, 2009) | Apr 17, 2021 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +255 days, USPTO patent term adjustment record | Dec 28, 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 | 2 of 2 maintenance fees paid | term ended | High confidence |
| USPTO status record | Recorded as expired for non-payment on Mar 10, 2025, after the term ended | no change | High confidence |
| Computed term end | The steps above, in order | Dec 28, 2021 | High confidence |
This family
| US 7,500,075 | In force Nov 2031 | Nov 2031 |
| US 8,370,596 | this patent Dec 2021 | Dec 2021 |
| US 8,856,480 | Term ended Apr 2021 | Apr 2021 |
| US 9,257,161 | Term ended Apr 2021 | Apr 2021 |
| US 9,417,800 | Term ended Apr 2021 | Apr 2021 |
| US 10,146,445 | Term ended Apr 2021 | Apr 2021 |
| US 10,860,216 | Term ended Apr 2021 | Apr 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 |
|---|---|---|---|
| Sep 3, 2014 Reel 33661, frame 246 | Garrett, Billy, JR. | Rambus Inc. | Assignment of Assignor's Interest |
| Dec 2, 2021 Reel 58298, frame 836 | Rambus Inc. | Highlands LLC | Assignment of Assignor's Interest |
| Dec 10, 2021 Reel 58956, frame 139 | Highlands LLC | Rampart Asset Management, LLC | 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 255 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
8
later US patents cite this one
That is above the median of utility patents granted in 2013 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.