Term ended Aug 21, 2025 · High confidence
20-year base term ended Sep 30, 2024
Held by Silvaco, Inc.
Filed Sep 30, 2004 as application 10/955,527 · Granted Feb 26, 2008
Base term plus 325 days of patent term adjustment (USPTO delay)
Today
Term ended Aug 21, 2025
2004
2026
Clock starts
Sep 30, 2004
Sep 30, 2004
Term ended
Aug 21, 2025
Aug 21, 2025
Granted
Feb 26, 2008
Feb 26, 2008
base term
patent term adjustment
after the term ends
fee events
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
325
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
3 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.
11
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 325 days past its 20-year base term on prosecution delay. All three maintenance fees were paid, so no fee lapse ended it. 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 30, 2004, when this application, 10/955,527, was filed | Sep 30, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +325 days, USPTO patent term adjustment record | Aug 21, 2025 | 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 | 3 of 3 maintenance fees paid | term ended | High confidence |
| Computed term end | The steps above, in order | Aug 21, 2025 | High confidence |
This family
| US 7,275,225 | Term ended Apr 2025 | Apr 2025 |
| US 7,277,165 | Term ended May 2025 | May 2025 |
| US 7,266,800 | Term ended Apr 2025 | Apr 2025 |
| US 7,246,343 | Term ended Apr 2025 | Apr 2025 |
| US 7,189,481 | Lapsed on the fee record Mar 2019 | Mar 2019 |
| US 7,337,421 | this patent Aug 2025 | Aug 2025 |
| Application 10/960,357 | Abandoned not computed | not computed |
| US 7,588,868 | In force Aug 2027 | Aug 2027 |
8 of 11 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 |
|---|---|---|---|
| Sep 30, 2004 Reel 15859, frame 771 | Kamat, Vishnu Govind | Invarium, Inc. | Assignment of Assignor's Interest |
| Jun 19, 2008 Reel 21122, frame 394 | Invarium, Inc. | Cadence Design Systems, Inc. | Assignment of Assignor's Interest |
| Mar 14, 2025 Reel 70519, frame 972 | Cadence Design Systems, Inc. | Silvaco, 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.
What's changing
Note
The 325 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
162
later US patents cite this one
That is top 5% of utility patents granted in 2008 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.