Lapsed Jul 7, 2021 on the fee record · Medium confidence
20-year base term ended Dec 1, 2024
Why Medium: A terminal disclaimer is on file (approved) with no resolved reference, so the term may end earlier.
Third maintenance fee unpaid; grace period ended.
Held by Power Integrations, Inc.
Filed Apr 6, 2007 as application 11/783,224 · Granted Jul 7, 2009
Base term, 20 years from filing, plus 66 days of patent term adjustment (USPTO delay)
Today
Lapsed Jul 7, 2021
2004
2026
Clock starts
Dec 1, 2004
Dec 1, 2004
No longer in force
Jul 7, 2021
Jul 7, 2021
Granted
Jul 7, 2009
Jul 7, 2009
Term would have run to
Feb 5, 2025
Feb 5, 2025
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
66
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.
25
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 Feb 5, 2025: its 20-year base term plus 66 days of term adjustment for prosecution delay. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. Confidence: Medium. 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 Dec 1, 2004, when application 11/000,222, the earliest non-provisional in its chain, was filed (this one was filed Apr 6, 2007) | Dec 1, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +66 days, USPTO patent term adjustment record | Feb 5, 2025 | 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 | lapsed Jul 7, 2021 | High confidence |
| Computed term end | The steps above, in order | Jul 7, 2021 | Medium confidence |
This family
| US 7,202,528 | Term ended no later than Apr 2025 | no later than Apr 2025 |
| Application PCT/US2005/042982 | PCT application no patent term | no patent term |
| US 7,274,083 | Term ended May 2026 | May 2026 |
| US 7,556,994 | this patent Jul 2021 | Jul 2021 |
| Application PCT/US2007/010712 | PCT application no patent term | no patent term |
| US 7,602,228 | In force May 2027 | May 2027 |
| US 7,821,015 | Lapsed on the fee record Oct 2022 | Oct 2022 |
| Application PCT/US2007/071549 | PCT application no patent term | no patent term |
8 of 25 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 |
|---|---|---|---|
| Dec 22, 2009 Reel 23691, frame 114 | Semisouth Laboratories, Inc. | Bluecrest Venture Finance Master Fund Limited | Security Agreement |
| Jul 25, 2011 Reel 26645, frame 351 | Bluecrest Venture Finance Master Fund Limited | Semisouth Laboratories, Inc. | Release of Security Interest |
| Sep 23, 2011 Reel 26956, frame 221 | Semisouth Laboratories, Inc. | SS SC IP, LLC | Assignment of Assignor's Interest |
| Jul 5, 2013 Reel 30740, frame 368 | SS SC IP, LLC | Power Integrations, 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
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Note
The 66 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 Jul 7, 2021. We will not guess the cap.
Citations
16
later US patents cite this one
That is above the median of utility patents granted in 2009 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.