Term ends May 26, 2029 · Medium confidence
20-year base term ends May 29, 2028
Why Medium: A parent in the chain could not be resolved.
Filed Jan 10, 2017 as application 15/402,759 · Granted Dec 17, 2019
Base term plus 362 days of patent term adjustment (USPTO delay)
Today
2008
2029
Clock starts
May 29, 2008
May 29, 2008
Term ends
May 26, 2029
May 26, 2029
Granted
Dec 17, 2019
Dec 17, 2019
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
362
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
1 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. 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 362 days past its 20-year base term on prosecution delay. 1 of 2 maintenance fees is paid so far. 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 May 29, 2008, when application PCT/US2008/006799, the earliest non-provisional in its chain, was filed (this one was filed Jan 10, 2017); a parent in its chain could not be resolved (the next row) | May 29, 2028 | 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 | +362 days, USPTO patent term adjustment record | May 26, 2029 | 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 | 1 of 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | May 26, 2029 | Medium confidence |
This family
| Application 12/792,307 | Abandoned not computed | not computed |
| US 8,287,743 | In force May 2028 | May 2028 |
| US 8,622,222 | In force May 2028 | May 2028 |
| US 8,372,276 | In force May 2028 | May 2028 |
| Application 13/396,275 | Abandoned not computed | not computed |
| US 8,840,783 | In force Jul 2028 | Jul 2028 |
| US 9,573,824 | In force May 2028 | May 2028 |
| US 10,507,431 | this patent May 2029 | May 2029 |
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 |
|---|---|---|---|
| Oct 16, 2026 Reel 76718, frame 189 | Dupont Specialty Materials Singapore Pte. Ltd. | Filmtec Water Singapore Pte. Ltd. | 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
May 2029
Term ends May 26, 2029. Maintenance fees still fall due before then
Note
The 362 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
0
later US patents cite this one
That is below the median of utility patents granted in 2019 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.