Patent US2687380A successfully refreshed from Google Patents.
US2687380A
Expired / Lapsed
US
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Regeneration of a silver catalyst useful in the preparation of ethylene oxide
Assignee: Chempatents Inc
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Filing: 1950-05-01
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Granted: 1954-08-24
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Expires: 1970-05-01
Abstract
No abstract record available.
Inventors
- 👤 Saffer Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:36
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/04; C07D301/08; C07D301/10; B; B01; B01J; B01J23/00; B01J23/90; B01J23/96; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y02P20/584
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A METHOD OF INCREASING THE ACTIVITY AND EFFICIENCY OF A SILVER SURFACE CATALYST USEFUL IN THE PREPARATION OF ETHYLENE OXIDE BY THE PARTIAL OXIDATION OF ETHYLENE WITH GASEOUS OXYGEN, THE ACTIVITY AND EFFICIENCY OF SAID CATALYST BEING LOWER THAN ITS POTENTIAL HICH ACTIVITY AND EFFICIENCY WHICH METHOD COMPRISES CONTACTING SAID CATALYST AT A TEMPERATURE IN THE RANGE OF 220 TO 350* C. WITH A GASEOUS MIXTURE CONTAINING ABOVE ABOUT 0.8 UP TO ABOUT 4% BY VOLUME OF ETHYLENE OXIDE, THE LATTER BEING THE ESSENTIAL AGENT FOR INCREASING SAID ACTIVITY AND EFFICIENCY, THE OUTPUT OF ETHYLENE OXIDE FROM ANY FEED GASES IN SAID MIXTURE BEING INSUFFICIENT TO PROVIDE THE SAID AMOUNT THEREOF, WHEREBY AN IMPROVE CATALYST IS OBTAINED.
Claim 2
Independent Claim
117 words
A METHOD OF INCREASING THE ACTIVITY AND EFFICIENCY OF A SILVER SURFACE CATALYST USEFUL IN THE PREPARATION OF ETHYLENE OXIDE BY THE PARTIAL OXIDATION OF ETHYLENE WITH GASEOUS OXYGEN, THE ACTIVITY AND EFFICIENCY OF SAID CATALYST BEING LOWER THAN ITS POTENTIAL HICH ACTIVITY AND EFFICIENCY WHICH METHOD COMPRISES CONTACTING SAID CATALYST AT A TEMPERATURE IN THE RANGE OF 220 TO 350* C. WITH A GASEOUS MIXTURE CONTAINING ABOVE ABOUT 0.8 UP TO ABOUT 4% BY VOLUME OF ETHYLENE OXIDE, THE LATTER BEING THE ESSENTIAL AGENT FOR INCREASING SAID ACTIVITY AND EFFICIENCY, THE OUTPUT OF ETHYLENE OXIDE FROM ANY FEED GASES IN SAID MIXTURE BEING INSUFFICIENT TO PROVIDE THE SAID AMOUNT THEREOF, WHEREBY AN IMPROVE CATALYST IS OBTAINED.
References Cited (Backward Citations)
US2219575A
Cited
US2479885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |