Lapsed Apr 9, 2025 on the fee record · High confidence
20-year base term ends Feb 24, 2029
Third maintenance fee unpaid; grace period ended.
Held by Rambus Inc.
Filed Oct 13, 2009 as application 12/578,441 · Granted Apr 9, 2013
Base term, 20 years from filing, plus 636 days of patent term adjustment (USPTO delay)
Today
Lapsed Apr 9, 2025
2009
2030
Clock starts
Feb 24, 2009
Feb 24, 2009
No longer in force
Apr 9, 2025
Apr 9, 2025
Granted
Apr 9, 2013
Apr 9, 2013
Term would have run to
Nov 22, 2030
Nov 22, 2030
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
636
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 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.
22
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 Nov 22, 2030: its 20-year base term plus 636 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 Feb 24, 2009, when application 12/380,094, the earliest non-provisional in its chain, was filed (this one was filed Oct 13, 2009) | Feb 24, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +636 days, USPTO patent term adjustment record | Nov 22, 2030 | 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 Apr 9, 2025 | High confidence |
| Computed term end | The steps above, in order | Apr 9, 2025 | High confidence |
This family
| US 8,151,235 | Lapsed on the fee record Apr 2024 | Apr 2024 |
| US 8,418,091 | this patent Apr 2025 | Apr 2025 |
| Application 61/436,485 | Provisional application no patent term | no patent term |
| Application PCT/US2012/022791 | PCT application no patent term | no patent term |
| US 8,510,700 | Lapsed on the fee record Aug 2025 | Aug 2025 |
| Application 61/606,260 | Provisional application no patent term | no patent term |
| Application PCT/US2013/028761 | PCT application no patent term | no patent term |
| US 9,355,199 | Lapsed on the fee record May 2024 | May 2024 |
8 of 22 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 |
|---|---|---|---|
| Oct 14, 2009 Reel 23369, frame 812 | Chow, Lap Wai; Baukus, James P.; Wang, Bryan J.; Cocchi, Ronald P. | Syphermedia International, Inc. | Assignment of Assignor's Interest |
| Feb 27, 2018 Reel 45053, frame 301 | Syphermedia International, Inc. | Inside Secure S.A. | Assignment of Assignor's Interest |
| Feb 27, 2019 Reel 48449, frame 887 | Inside Secure | Glas Sas, As Security Agent | Security Interest |
| Oct 7, 2019 Reel 50647, frame 428 | Inside Secure | Verimatrix | Change of Name |
| Oct 16, 2019 Reel 50733, frame 3 | Verimatrix | Verimatrix | Change of Address |
| Nov 21, 2019 Reel 51076, frame 306 | Glas Sas, As Agent | Inside Secure | Partial Release of Security Interest in Patent Collateral |
| Dec 12, 2019 Reel 51262, frame 413 | Verimatrix | Rambus 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.
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Alerts on its grants, lapses and transfers.
What's changing
Note
The 636 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
24
later US patents cite this one
That is top 25% 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.