US2680757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst recovery process
Assignee: Richfield Oil Corp
•
Filing: 1952-07-01
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Granted: 1954-06-08
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Expires: 1972-07-01
Abstract
No abstract record available.
Inventors
- 👤 Chester M Himel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:38
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/04; B01J31/40; B01J31/4015; B01J31/4023; B01J31/403; C; C07; C07C; C07C51/00; C07C51/42; B01J2231/00; B01J2231/70; B01J2531/00; B01J2531/30; B01J2531/38; B01J2531/70; B01J2531/72; B01J2531/80; B01J2531/84; B01J2531/845; B01J2531/90; B01J2531/96; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A METHOD FOR THE RECOVERY OF CATALYST FROM THE REACTION MIXTURE PRODUCED BY THE LIQUID PHASE, AIR OXIDATION OF XYLENES USING AS A CATALYST A SALT SOLUBLE IN THE REACTION MIXTURE AND SELECTED FROM THE GROUP CONSISTING OF COBALT, MAGNANESE AND CERIUM SALTS IN ORDER TO PRODUCE TOLUIC ACIDS, THE SAID METHOD COMPRISING MAINTAINING SAID MIXTURE AT A TEMPERATURE OF FROM ABOUT 120* C. TO ABOUT 200* C. WHILE SATURATED WITH WATER AND IN CONTACT WITH A SUBSTANTIALLY OXYGEN-FREE GAS FOR A PERIOD OF TIME SUFFICIENT TO EFFECT A PRECIPITATION OF THE CATALYST FROM THE REACTION MIXTURE.
Claim 2
Independent Claim
97 words
A METHOD FOR THE RECOVERY OF CATALYST FROM THE REACTION MIXTURE PRODUCED BY THE LIQUID PHASE, AIR OXIDATION OF XYLENES USING AS A CATALYST A SALT SOLUBLE IN THE REACTION MIXTURE AND SELECTED FROM THE GROUP CONSISTING OF COBALT, MAGNANESE AND CERIUM SALTS IN ORDER TO PRODUCE TOLUIC ACIDS, THE SAID METHOD COMPRISING MAINTAINING SAID MIXTURE AT A TEMPERATURE OF FROM ABOUT 120* C. TO ABOUT 200* C. WHILE SATURATED WITH WATER AND IN CONTACT WITH A SUBSTANTIALLY OXYGEN-FREE GAS FOR A PERIOD OF TIME SUFFICIENT TO EFFECT A PRECIPITATION OF THE CATALYST FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US2547178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |