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Patent US2789137A successfully refreshed from Google Patents.
US2789137A
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Acetic acid anhydride
Assignee: BASF SE
•
Filing: 1953-06-22
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Granted: 1957-04-16
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Expires: 1973-06-22
Abstract
No abstract record available.
Inventors
- 👤 Reppe Walter
- 👤 Friederich Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:34
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A PROCESS FOR THE PRODUCTION OF ACETIC ACID ANHYDRIDE WHICH COMPRISES TREATING IN AN ANHYDROUS INERT ORGANIC SOLVENT MEDIUM, CONTAINING A CATALYST CONSISTING OF A MEMBER OF THE GROUP CONSISTING OF CABALT IODIDE, AND A MIXTURE OF COBALT IODIDE AND COBALT BROMIDE, DIMETHYL ETHER WITH CARBON MONOXIDE UNDER A PRESSURE EXCEEDING 400 ATMOSPHERES AND AT A TEMPERATURE BETWEEN 150 AND 220*C.
Claim 2
Dependent Claim
61 words
A PROCESS FOR THE PRODUCTION OF ACETIC ACID ANHYDRIDE WHICH COMPRISES TREATING IN AN ANHYDROUS INERT ORGANIC SOLVENT MEDIUM, CONTAINING A CATALYST CONSISTING OF A MEMBER OF THE GROUP CONSISTING OF CABALT IODIDE, AND A MIXTURE OF COBALT IODIDE AND COBALT BROMIDE, DIMETHYL ETHER WITH CARBON MONOXIDE UNDER A PRESSURE EXCEEDING 400 ATMOSPHERES AND AT A TEMPERATURE BETWEEN 150 AND 220*C.
References Cited (Backward Citations)
US2075100A
Cited
US2593440A
Cited
US2607787A
Cited
US2727902A
Cited
US2730546A
Cited
US2729651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |