Patent US3215638A successfully refreshed from Google Patents.
US3215638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic methanol solutions of aluminum chloride and zinc chloride
Assignee: Celanese Corp
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Filing: 1962-11-05
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Granted: 1965-11-02
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Expires: 1982-11-05
Abstract
No abstract record available.
Inventors
- 👤 Dunn Kenneth Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:06
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A CATALYST COMPOSITION FOR THE PREPARATION OF B-PROPIOLACTONE ESSENTIALLY COMSISTING OF A SOLUTION CONTAINING ABOUT 15 TO 20% BY WEIGHT OF SUBSTANTIALLY ANHYDROUS ALUMINUM CHLORIDE AND MINOR AMOUNTS OF ZINC CHLORIDE IN METHANOL.
Claim 2
Dependent Claim
33 words
A CATALYST COMPOSITION FOR THE PREPARATION OF B-PROPIOLACTONE ESSENTIALLY COMSISTING OF A SOLUTION CONTAINING ABOUT 15 TO 20% BY WEIGHT OF SUBSTANTIALLY ANHYDROUS ALUMINUM CHLORIDE AND MINOR AMOUNTS OF ZINC CHLORIDE IN METHANOL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |