US3575888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver catalyst
Assignee: Shell USA Inc
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Filing: 1969-04-28
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Granted: 1971-04-20
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Expires: 1989-04-28
Abstract
Abstract A SUPPORTED SILVER CATALYST, USEFUL IN THE PREPARATION OF ETHYLENE OXIDE, IS PRODUCED BY REDUCING A DRIED, SUPPORTED, REDUCIBLE SILVER COMPOUND, IN THE ABSENCE OF ANY SUBSTANTIAL AMOUNT OF WATER, WITH A SOLUTION OF A REDUCING AGENT IN A SUITABLE SOLVENT IN WHICH THE SILVER COMPOUND IS AT MOST ONLY SLIGHTLY SOLUBLE.
Inventors
- 👤 John C Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:40
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/48; B01J23/50; C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/04; C07D301/08; C07D301/10
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |