Also listed on Ixys, LLC, an earlier holder on the record. The recorded assignments below show how it moved.
Term ends no later than Dec 4, 2028 · Low confidence
20-year base term ended Feb 10, 2024
In force on USPTO's status record and by its fee record. A terminal disclaimer on file may shorten this term, possibly to a date already past; its reference document is unresolved, so the date above is an upper bound and no earlier date is guessed.
Held by Ixys Intl Limited
Filed Apr 22, 2008 as application 12/148,925 · Granted Feb 10, 2015
Base term plus 1759 days of patent term adjustment (USPTO delay)
Today
2004
2028
Clock starts
Feb 10, 2004
Feb 10, 2004
Ends no later than
Dec 4, 2028
Dec 4, 2028
Granted
Feb 10, 2015
Feb 10, 2015
base term
patent term adjustment
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
1,759
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Unresolved
Terminal disclaimer
On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.
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.
10
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 1759 days past its 20-year base term on prosecution delay. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. 2 of 3 maintenance fees are paid so far. Confidence: Low. 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 10, 2004, when application 10/777,023, the earliest non-provisional in its chain, was filed (this one was filed Apr 22, 2008); a parent in its chain could not be resolved (the next row) | Feb 10, 2024 | High confidence |
| Continuity chain | A parent in the chain could not be resolved | dated from this application's own claim | Medium confidence |
| Patent term adjustment | +1759 days, USPTO patent term adjustment record | Dec 4, 2028 | High confidence |
| Terminal disclaimer cap | Disclaimer on file (approved), reference document not resolved | no cap applied, and none guessed | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | no later than Dec 4, 2028 | Low confidence |
This family
| US 7,259,696 | Term ended Aug 2025 | Aug 2025 |
| US 7,339,513 | Term ended Oct 2024 | Oct 2024 |
| US 7,286,076 | Lapsed on the fee record Oct 2019 | Oct 2019 |
| US 7,936,287 | Term ended Aug 2026 | Aug 2026 |
| US 8,952,840 | this patent no later than Dec 2028 | no later than Dec 2028 |
| US 8,174,411 | Term ended Feb 2024 | Feb 2024 |
| US 9,792,133 | Term ended Aug 2024 | Aug 2024 |
| US 9,542,212 | Term ended no later than Jun 2024 | no later than Jun 2024 |
8 of 10 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 |
|---|---|---|---|
| Apr 22, 2008 Reel 20895, frame 534 | Provis, Adam P.g.; Miramontes, Oscar C.; Vergis, George C. | Zilog, Inc. | Assignment of Assignor's Interest |
| Mar 4, 2009 Reel 22343, frame 395 | Zilog, Inc.; Zilog International, Ltd. | Uei Cayman Inc. | Assignment of Assignor's Interest |
| Mar 23, 2011 Reel 26002, frame 1 | Uei Cayman Inc. | Ixys CH GmbH | Assignment of Assignor's Interest |
| May 19, 2015 Reel 35666, frame 816 | Ixys CH GmbH | Ixys Intl Limited | 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.
What's changing
Dec 2028
Term ends no later than Dec 4, 2028.
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Note
The 1759 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Open question
A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than Dec 4, 2028. We will not guess the cap.
Citations
1
later US patent cites this one
That is below the median 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
This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. Related patents and pending applications may cover overlapping subject matter.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.