US2572810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of amides
Assignee: GAF Chemicals Corp
•
Filing: 1948-03-18
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Granted: 1951-10-23
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Expires: 1968-03-18
Abstract
No abstract record available.
Inventors
- 👤 Charles F Jelinek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:50
CPC Classifications
C; C07; C07C; C07C231/00; C07C231/10; C07C231/02; C07C233/00; C07C233/01; C07C233/02; C07C233/04; C07C233/05; C07C233/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A PROCESS OF PREPARING AN AMIDE OF A CARBOXYLIC ACID WHICH COMPRISES REACTING BY HEATING AT A TEMPERATURE OF FROM ABOUT 125 TO ABOUT 230* C., A MIXTURE OF AN ACETAL OF THE FORMULA:
Claim 2
Dependent Claim
34 words
A PROCESS OF PREPARING AN AMIDE OF A CARBOXYLIC ACID WHICH COMPRISES REACTING BY HEATING AT A TEMPERATURE OF FROM ABOUT 125 TO ABOUT 230* C., A MIXTURE OF AN ACETAL OF THE FORMULA:
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |