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US2898353A
Expired / Lapsed
US
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Preparation of amides
Assignee: GAF Chemicals Corp
•
Filing: 1957-07-29
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Granted: 1959-08-04
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Expires: 1977-07-29
Abstract
No abstract record available.
Inventors
- 👤 Schulze Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:49
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
THE METHOD OF PRODUCTING CARBOXLIC AMIDES WHICH COMPRISES REACTING A MIXED ANHYDRIDE OF BORIC ACID AND OF AN ORGANIC CARBOXYLIC ACID WITH AN AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY AMINES.
Claim 2
Independent Claim
34 words
THE METHOD OF PRODUCTING CARBOXLIC AMIDES WHICH COMPRISES REACTING A MIXED ANHYDRIDE OF BORIC ACID AND OF AN ORGANIC CARBOXYLIC ACID WITH AN AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY AMINES.
References Cited (Backward Citations)
US2606915A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |