Term ended Apr 8, 2025 · High confidence
20-year base term ended Apr 8, 2025
Filed Dec 5, 2009 as application 12/631,821 · Granted Mar 20, 2012
Base term, 20 years from filing
Today
Term ended Apr 8, 2025
2005
2026
Clock starts
Apr 8, 2005
Apr 8, 2005
Term ended
Apr 8, 2025
Apr 8, 2025
Granted
Mar 20, 2012
Mar 20, 2012
base term
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
None
Term adjustment
No prosecution delay on this record.
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.
4
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. 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 Apr 8, 2005, when application 11/102,496, the earliest non-provisional in its chain, was filed (this one was filed Dec 5, 2009) | Apr 8, 2025 | 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 | 3 of 3 maintenance fees paid | term ended | High confidence |
| Computed term end | The steps above, in order | Apr 8, 2025 | High confidence |
This family
| US 7,642,205 | In force Dec 2026 | Dec 2026 |
| Application PCT/US2006/005929 | PCT application no patent term | no patent term |
| US 8,138,105 | this patent Apr 2025 | Apr 2025 |
| US 8,557,721 | Term ended Apr 2025 | Apr 2025 |
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 5, 2009 Reel 23609, frame 997 | Timans, Paul J | Mattson Technology, Inc. | Assignment of Assignor's Interest |
| Aug 27, 2018 Reel 46956, frame 348 | Mattson Technology, Inc. | East West Bank | Security Interest |
| Sep 30, 2019 Reel 50582, frame 796 | Mattson Technology, Inc. | Mattson Technology, Inc.; Beijing e-Town Semiconductor Technology, Co., Ltd. | Assignment of Assignor's Interest |
| Sep 30, 2019 reel/frame not recorded | Mattson Technology, Inc. | Mattson Technology, Inc. | Assignment of Assignor's Interest |
| Sep 30, 2019 reel/frame not recorded | Mattson Technology, Inc. | Beijing e-Town Semiconductor Technology, Co., Ltd. | Assignment of Assignor's Interest |
| Apr 15, 2021 Reel 55950, frame 452 | East West Bank | Mattson Technology, Inc. | Release of Security 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.
Citations
45
later US patents cite this one
That is top 25% of utility patents granted in 2012 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.