US3793231A
Expired / Lapsed
US
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Preparation of silver catalysts for the production of ethylene oxide
Assignee: Huels AG
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Filing: 1971-04-14
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Granted: 1974-02-19
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Expires: 1991-04-14
Abstract
Abstract SILVER CATALYSTS USEFUL FOR THE PRODUCTION OF EHYLENE OXIDE BY THE OXIDATION OF ETHYLENE WITH OXYGEN OR AN OXYGEN CONTAINING GAS ARE PRODUCED BY A PROCESS IN WHICH A POROUS SUPPORT MATERIAL IS IMPREGNATED WITH A SUSPENSION OF SILVER OXIDE IN AN AQUEOUS SLUTION OF A SILVER SALT OF AN ORGANIC ACID WHEREIN THE MOLAR RATIO OF SILVER OXIDE TO DISSOLVED SILVER SALT IS ABOUT 1.86:1 TO 1:1.86 (35-65 MOLAR PERCENT SILVER OXIDE BASED ON COMBINED SILVER OXIDE AND SILVER SALT) AND THE IMPREGNATED SUPPORT IS THEN HEATED TO 160-230*C.
Inventors
- 👤 H Springmann
- 👤 H Ueberschaer
- 👤 H Bergmann
- 👤 W Brauckmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:02
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/04; C07D301/08; C07D301/10; B; B01; B01J; B01J23/00; B01J23/38; B01J23/48; B01J23/50; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |