US3640901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidative conversion catalyst
Assignee: Phillips Petroleum Co
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Filing: 1969-01-27
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Granted: 1972-02-08
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Expires: 1989-01-27
Abstract
Abstract A CATALYST FOR OXIDATIVE CONVERSION COMPRISING A TIN OXIDE-PHOSPHATE COMPLEX IN COMBINATION WITH A NONPOROUS SILICA CATALYST SUPPORT HAVING AN AVERAGE ULTIMATE PARTICLE DIAMETER OF LESS THAN 1 MICRON, A SURFACE AREA WITHIN THE RANGE OF ABOUT 1 TO 1500 SQUARE METERS PER GRAM AND A DENSITY OF LESS THAN ABOUT 0.2 GRAM PER CUBIC CENTIMETER, THE COMPLEX BEING PREPARED BY IMPREGNATING THE CARRIER WITH STANNOUS SULFATE, DRYING, CONTACTING THE IMPREGNATED CARRIER WITH PHOSPHORIC ACID AND CALCINING.
Inventors
- 👤 Darrell W Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:58
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; B01J27/18; B01J27/1802; B01J27/1813; C; C07; C07C; C07C5/00; C07C5/42; C07C5/48; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |