Term ends Apr 30, 2030 · High confidence
20-year base term ends Apr 30, 2030
Held by Littelfuse, Inc.
Filed Dec 1, 2014 as application 14/556,940 · Granted Nov 3, 2015
Base term, 20 years from filing
Today
2010
2030
Clock starts
Apr 30, 2010
Apr 30, 2010
Term ends
Apr 30, 2030
Apr 30, 2030
Granted
Nov 3, 2015
Nov 3, 2015
base term
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
None
Term adjustment
No prosecution delay on this record.
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.
3
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 is its 20-year base term, with no adjustment for prosecution delay. 2 of 3 maintenance fees are paid so far. 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 30, 2010, when application 12/771,643, the earliest non-provisional in its chain, was filed (this one was filed Dec 1, 2014) | Apr 30, 2030 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | 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 | In force | High confidence |
| Computed term end | The steps above, in order | Apr 30, 2030 | High confidence |
This family
| US 8,455,987 | In force Sep 2030 | Sep 2030 |
| US 8,901,723 | In force May 2030 | May 2030 |
| US 9,177,888 | this patent Apr 2030 | Apr 2030 |
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 |
|---|---|---|---|
| Dec 1, 2014 Reel 34290, frame 802 | Spann, Thomas; Ostmann, Holger; Choi, Kang Rim | Ixys Corporation | Assignment of Assignor's Interest |
| Mar 31, 2018 Reel 45406, frame 618 | Ixys Corporation; Ixys, LLC | Ixys, LLC | Merger and Change of Name |
| May 1, 2019 Reel 49056, frame 649 | Ixys, LLC | Littelfuse, 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Apr 2030
Term ends Apr 30, 2030. Maintenance fees still fall due before then
Citations
0
later US patents cite 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
Computed patent terms end on the dates shown. 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.