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.
Nov 10, 2006
Nov 10, 2026
Dec 9, 2014
This patent's term is its 20-year base term, with no adjustment for prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. All three maintenance fees were paid, so no fee lapse ended it. Confidence: Medium. from the record
How we calculated this date
| 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 Jun 7, 2013); 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 | None on file | no change | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,039,509) | resolves to Nov 10, 2026, no earlier than this term, so no change | 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 | Term ended Nov 2026 | Nov 2026 |
| US 8,476,312 | Term ended Nov 2026 | Nov 2026 |
| US 8,906,956 | this patent Nov 2026 | Nov 2026 |
| US 9,814,775 | Term ended Nov 2026 | Nov 2026 |
Assignments
| Recorded | Assignor | Assignee | Conveyance |
|---|---|---|---|
| Apr 29, 2022 Reel 59714, frame 757 | 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.
A terminal disclaimer resolved from the filed document, referencing US 8,039,509, ends no earlier than this term, so it caps nothing.