US2740762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactivation of platinum group metals contaminated with iron containing material
Assignee: Phillips Petroleum Co
•
Filing: 1952-04-21
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Granted: 1956-04-03
•
Expires: 1972-04-21
Abstract
No abstract record available.
Inventors
- 👤 George C Earley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:59
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/96; Y; Y10; Y10S; Y10S55/00; Y10S55/31
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD FOR IMPROVING THE ACTIVITY OF A CATALYST CONSISTING ESSENTIALLY OF AT LEAST ONE PLATINUM GROUP METAL WHICH HAS UNDERGONE LOSS IN ACTIVITY DURING USE BY CONTAMINATION WITH IRON-CONTAINING MATERIAL WHICH COMPRISES SUBJECTING SAME TO THE ACTION OF A REDUCING GAS AT A TEMPERATURE OF AT LEAST 350* F. AND BELOW THE TEMPERATURE AT WHICH SAID CATALYST BECOMES EMBRITTLED, SUBJECTING SAME TO THE ACTION OF AN AQUEOUS ACID SELECTED FROM THE GROUP CONSISTING OF HYDROCHLORIC ACID, NITRIC ACID, SULFURIC ACID, PHOSPHORIC ACID AND FORMIC ACID AND REMOVING SAID ACID FROM SAID CATALYST.
Claim 2
Independent Claim
93 words
A METHOD FOR IMPROVING THE ACTIVITY OF A CATALYST CONSISTING ESSENTIALLY OF AT LEAST ONE PLATINUM GROUP METAL WHICH HAS UNDERGONE LOSS IN ACTIVITY DURING USE BY CONTAMINATION WITH IRON-CONTAINING MATERIAL WHICH COMPRISES SUBJECTING SAME TO THE ACTION OF A REDUCING GAS AT A TEMPERATURE OF AT LEAST 350* F. AND BELOW THE TEMPERATURE AT WHICH SAID CATALYST BECOMES EMBRITTLED, SUBJECTING SAME TO THE ACTION OF AN AQUEOUS ACID SELECTED FROM THE GROUP CONSISTING OF HYDROCHLORIC ACID, NITRIC ACID, SULFURIC ACID, PHOSPHORIC ACID AND FORMIC ACID AND REMOVING SAID ACID FROM SAID CATALYST.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |