Patent US3637893A successfully refreshed from Google Patents.
US3637893A
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Olefin disproportionation
Assignee: Shell USA Inc
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Filing: 1969-07-22
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Granted: 1972-01-25
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Expires: 1989-07-22
Abstract
Abstract OLEFINS ARE DISPROPORTIONATED WITH A CATALYST PRODUCED BY CONTACTING (A) A MOLYBDENUM OR TUNGSTEN OXIDE SUPPORTED ON AN INORGANIC REFRACTORY OXIDE AND (B) A PERCHLOROHYDROCARBON AT ELEVATED TEMPERATURES.
Inventors
- 👤 David M Singleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:39
CPC Classifications
C; C07; C07C; C07C6/00; C07C6/02; C07C6/04; C07C6/06
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |