US3755198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for adding cadmium to supported noble metal dehydrogenation catalyst
Assignee: Shell USA Inc
•
Filing: 1971-05-26
•
Granted: 1973-08-28
•
Expires: 1991-05-26
Abstract
Abstract Cadmium or zinc is added to a supported noble metal dehydrogenation catalyst by contacting the catalyst with an inert gas containing metallic cadmium or zinc vapors.
Inventors
- 👤 J Stratenus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:52
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/60; C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/3335; C07C5/3337
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
The process in accordance with claim 1 wherein the inert gas is hydrogen and the temperature is in the range of from 400* to 500* C.
Claim 2
Dependent Claim
13 words
The process in accordance with claim 2 wherein the noble metal is platinum.
References Cited (Backward Citations)
US2384501A
Cited
US2743215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |