US2855370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst
Assignee: Wyandotte Chemicals Corp
•
Filing: 1956-06-06
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Granted: 1958-10-07
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Expires: 1976-06-06
Abstract
No abstract record available.
Inventors
- 👤 Lester G Lundsted
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:32
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; B01J23/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
A PROCESS FOR PREPARING A NON-GEL COMPLEX CATALYST CONFORMING TO THE CHEMICAL FORMULA XCR2O3 WO3 WHEREIN X HAS A VALUE LYING WITHIN A RANGE FROM 0.20 TO 188, WHICH COMPRISES CONTACTING A CHROMIUM NITRATE WITH A SODIUM TUNGSTATE IN AQUEOUS SOLUTION, THE MOL RATIO OF SAID CHROMIUM NITRATE TO SAID SODIUM TUNGSTATE BEING SUFFICIENT TO GIVE X, WHEREBY XCR203.WO3 IS PRECIPITATED IN A GEL-FREE CONDITION AND SODIUM NITRATE; WASH ING THE GEL-FREE PRECIPITATE FREE OF SODIUM NITRATE; AND THEN SUBJECTING THE PRECIPATE TO FILTRATION FOLLOWED BY HEAT DRYING.
Claim 2
Dependent Claim
88 words
A PROCESS FOR PREPARING A NON-GEL COMPLEX CATALYST CONFORMING TO THE CHEMICAL FORMULA XCR2O3 WO3 WHEREIN X HAS A VALUE LYING WITHIN A RANGE FROM 0.20 TO 188, WHICH COMPRISES CONTACTING A CHROMIUM NITRATE WITH A SODIUM TUNGSTATE IN AQUEOUS SOLUTION, THE MOL RATIO OF SAID CHROMIUM NITRATE TO SAID SODIUM TUNGSTATE BEING SUFFICIENT TO GIVE X, WHEREBY XCR203.WO3 IS PRECIPITATED IN A GEL-FREE CONDITION AND SODIUM NITRATE; WASH ING THE GEL-FREE PRECIPITATE FREE OF SODIUM NITRATE; AND THEN SUBJECTING THE PRECIPATE TO FILTRATION FOLLOWED BY HEAT DRYING.
Claim 3
Dependent Claim
70 words
A PROCESS FOR PREPARING A NON-GEL COMPLES CATALYST CONFORMING TO THE CHEMICAL FORMLA XCR2O3.WO3 WHEREIN X HAS A VALUE LYING WITHIN A RANGE FROM 0.20 TO 188, WHICH COMPRISES HEATING AN INTIMATE, PHYSICAL MIXTURE OF FINELY DIVIDED, SOLID CHROMIC OXIDE AND TUNGSTIC OXIDE TO A TEMPERATURE OF 1,000*C. UNTIL VIOLET-COLORED FUMES ARE EVOLVED, THE MOL RATIO OF CHROMIC OXIDE TO TUNGSTIC OXIDE IN SAID MIXTURE BEING SUFFICIENT TO GIVE X.
Claim 4
Dependent Claim
70 words
A PROCESS FOR PREPARING A NON-GEL COMPLES CATALYST CONFORMING TO THE CHEMICAL FORMLA XCR2O3.WO3 WHEREIN X HAS A VALUE LYING WITHIN A RANGE FROM 0.20 TO 188, WHICH COMPRISES HEATING AN INTIMATE, PHYSICAL MIXTURE OF FINELY DIVIDED, SOLID CHROMIC OXIDE AND TUNGSTIC OXIDE TO A TEMPERATURE OF 1,000*C. UNTIL VIOLET-COLORED FUMES ARE EVOLVED, THE MOL RATIO OF CHROMIC OXIDE TO TUNGSTIC OXIDE IN SAID MIXTURE BEING SUFFICIENT TO GIVE X.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |