Also listed on Air Products and Chemicals, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Apr 16, 2027 · High confidence
20-year base term ended Sep 22, 2026
Held by Versum Materials US, LLC
Filed Jan 12, 2009 as application 12/351,880 · Granted Jul 26, 2011
Base term plus 206 days of patent term adjustment (USPTO delay)
Today
2006
2027
Clock starts
Sep 22, 2006
Sep 22, 2006
Term ends
Apr 16, 2027
Apr 16, 2027
Granted
Jul 26, 2011
Jul 26, 2011
base term
patent term adjustment
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
206
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.
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 runs 206 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 22, 2006, when application 11/534,336, the earliest non-provisional in its chain, was filed (this one was filed Jan 12, 2009) | Sep 22, 2026 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +206 days, USPTO patent term adjustment record | Apr 16, 2027 | 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 | In force | High confidence |
| Computed term end | The steps above, in order | Apr 16, 2027 | High confidence |
This family
| US 7,477,444 | In force Feb 2027 | Feb 2027 |
| Application PCT/US2007/077840 | PCT application no patent term | no patent term |
| US 7,986,450 | this patent Apr 2027 | Apr 2027 |
| Application PCT/US2010/020713 | PCT application no patent term | no patent term |
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 |
|---|---|---|---|
| Oct 27, 2016 Reel 40503, frame 442 | Versum Materials US, LLC | Citibank, N.A., as Collateral Agent | Patent Security Agreement |
| Feb 20, 2017 Reel 41772, frame 733 | Air Products and Chemicals, Inc. | Versum Materials US, LLC | Assignment of Assignor's Interest |
| May 18, 2017 Reel 42424, frame 381 | Cao, Lan; Miller, David Darrell; Webber, Richard M.; Fazel, Shafiq N. | E Ink Corporation; Air Products and Chemicals, Inc. | Assignment of Assignor's Interest |
| May 18, 2017 reel/frame not recorded | Miller, David Darrell; Cao, Lan; Fazel, Shafiq N.; Webber, Richard M. | E Ink Corporation | Assignment of Assignor's Interest |
| May 18, 2017 reel/frame not recorded | Miller, David Darrell; Cao, Lan; Fazel, Shafiq N.; Webber, Richard M. | Air Products and Chemicals, Inc. | Assignment of Assignor's Interest |
| Oct 7, 2019 Reel 50647, frame 1 | Citibank, N.A., as Agent | Versum Materials US, LLC | 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.
What's changing
Apr 2027
Term ends Apr 16, 2027. No further fees fall due before then
Note
The 206 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
73
later US patents cite this one
That is top 10% of utility patents granted in 2011 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.