US2763644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of caprolactam
Assignee: EIDP Inc
•
Filing: 1955-04-15
•
Granted: 1956-09-18
•
Expires: 1975-04-15
Abstract
No abstract record available.
Inventors
- 👤 Donaruma Lorraine Guy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:09
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A PROCESS FOR THE PRODUCTION OF CAPROLACTAM WHICH COMPRISES ADDING AN AQUEOUS SOLUTION OF AN ALAKLI METAL SALT OF NITROCYCLOHEXANE, AN ALKALI METAL NITRITE,AND A MEMBER OF THE GROUP CONSISTING OF HYDRAZINE AND HYDRAZINE SALTS OF MINERAL ACIDS TO A CONCENTRATED MINERAL ACID OF THE GROUP CONSISTING OF SULFURIC ACID AND HYDROCHLORIC ACID.
Claim 2
Dependent Claim
53 words
A PROCESS FOR THE PRODUCTION OF CAPROLACTAM WHICH COMPRISES ADDING AN AQUEOUS SOLUTION OF AN ALAKLI METAL SALT OF NITROCYCLOHEXANE, AN ALKALI METAL NITRITE,AND A MEMBER OF THE GROUP CONSISTING OF HYDRAZINE AND HYDRAZINE SALTS OF MINERAL ACIDS TO A CONCENTRATED MINERAL ACID OF THE GROUP CONSISTING OF SULFURIC ACID AND HYDROCHLORIC ACID.
References Cited (Backward Citations)
US2313026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |