Also listed on Johnson Matthey Public Limited Company, an earlier holder on the record. The recorded assignments below show how it moved.
Term ended Nov 10, 2026 · Medium confidence
20-year base term ended Nov 10, 2026
Why Medium: A parent in the chain could not be resolved.
Held by Macfarlan Smith Limited
Filed Nov 22, 2011 as application 13/302,289 · Granted Mar 17, 2015
Base term plus 6 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
Term ended Nov 10, 2026
2006
2026
Clock starts
Nov 10, 2006
Nov 10, 2006
Term ended
Nov 10, 2026
Nov 10, 2026
Granted
Mar 17, 2015
Mar 17, 2015
base term
after the term ends
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
6
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 8,039,509, US 8,476,312, US 8,906,956.
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.
6
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 6 days past its 20-year base term on prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. All three maintenance fees were paid, so no fee lapse ended it. 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 Nov 10, 2006, when application 11/595,682, the earliest non-provisional in its chain, was filed (this one was filed Nov 22, 2011); a parent in its chain could not be resolved (the next row) | Nov 10, 2026 | 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 | +6 days, USPTO patent term adjustment record | Nov 16, 2026 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,039,509, US 8,476,312, US 8,906,956) | capped to Nov 10, 2026 | 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 | Nov 10, 2026 | Medium confidence |
This family
| US 8,039,509 | In force Apr 2030 | Apr 2030 |
| US 8,980,940 | this patent Nov 2026 | Nov 2026 |
| US 8,476,312 | Term ended Nov 2026 | Nov 2026 |
| US 8,906,956 | Term ended Nov 2026 | Nov 2026 |
| US 9,814,775 | Term ended Nov 2026 | Nov 2026 |
5 of 6 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 |
|---|---|---|---|
| Jul 9, 2012 Reel 28515, frame 255 | Rossi, Ronald; Silverberg, Lee Jonathan; Hogan, Robert; Shah, Ramesh M. | Johnson Matthey Public Limited Company | Assignment of Assignor's Interest |
| Nov 7, 2022 Reel 61888, frame 166 | Johnson Matthey Public Limited Company | Macfarlan Smith Limited | 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.
What's changing
Note
The 6 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 8,039,509, US 8,476,312, US 8,906,956.
Citations
13
later US patents cite this one
That is above the median of utility patents granted in 2015 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.