Term ends Dec 20, 2026 · Medium confidence
20-year base term ended Jun 30, 2024
Why Medium: A parent in the chain could not be resolved.
Held by Brita LP
Filed Sep 9, 2008 as application 12/207,284 · Granted May 1, 2012
Base term plus 903 days of patent term adjustment (USPTO delay)
Today
2004
2026
Clock starts
Jun 30, 2004
Jun 30, 2004
Term ends
Dec 20, 2026
Dec 20, 2026
Granted
May 1, 2012
May 1, 2012
base term
patent term adjustment
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
903
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 903 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 Jun 30, 2004, when application 10/881,517, the earliest non-provisional in its chain, was filed (this one was filed Sep 9, 2008); a parent in its chain could not be resolved (the next row) | Jun 30, 2024 | 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 | +903 days, USPTO patent term adjustment record | Dec 20, 2026 | 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 | Dec 20, 2026 | Medium confidence |
This family
| Application 11/927,372 | Abandoned not computed | not computed |
| US 8,167,141 | this patent Dec 2026 | Dec 2026 |
2 of 4 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 |
|---|---|---|---|
| Nov 2, 2010 Reel 25233, frame 134 | Knipmeyer, Elizabeth L.; Lynch, Toni L. | Brita LP | Assignment of Assignor's Interest |
| Dec 22, 2021 Reel 58465, frame 351 | Reid, Roger P.; Saaski, Bruce D. | Omnipure Filter Company, Inc. | Assignment of Assignor's Interest |
| Dec 22, 2021 Reel 58465, frame 359 | Omnipure Filter Company, Inc. | Brita LP | 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
Dec 2026
Term ends Dec 20, 2026. No further fees fall due before then
Note
The 903 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.