US3684693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Serial reforming with platinum catalyst in first stage and iridium,rhodium,ruthenium or osmium catalyst in second stage
Assignee: JOHN H SINFELT
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Filing: 1970-05-28
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Granted: 1972-08-15
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Expires: 1990-05-28
Abstract
Abstract A CONVENTIONAL REFORMING CATALYST, SUCH AS PLATINUMALUMINA, IS USED IN THE INITIAL ZONE OR REACTORS IN A CATALYTIC REFORMING PROCESS; THE TALL ZONE OF RACTORS CONTAINS A NOBLE METAL FROM THE FIRST OR SECOND SUBGROUPS OF GROUP VIII, DESIGNATED VIII1 AND VIII2, OF THE PERIODIC TABLE, SUPPORTED ON A SUITABLE REFRACTORY CARRIER. IN A PREFERRED EMBODIMENT, THE TAIL ZONE CONTAINS AN IRIDIUM CATALYST ON A POROUS SUPPORT SUCH AS ALUMNA.
Inventors
- 👤 John H Sinfelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:57
CPC Classifications
C; C10; C10G; C10G59/00; C10G59/02; C10G35/00; C10G35/04; C10G35/06; C10G35/085; C10G35/09
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |