Patent US3301900A successfully refreshed from Google Patents.
US3301900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing acrylamide
Assignee: Nobel Bozel SA
•
Filing: 1963-06-25
•
Granted: 1967-01-31
•
Expires: 1983-06-25
Abstract
No abstract record available.
Inventors
- 👤 Talet Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:07
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/02; C07C233/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN THE MANUFACTURE OF ACRYLAMIDE COMPRISING HYDROLIZING ACRYLONITRILE WITH SULPHURIC ACID, NEUTRALIZING THE REACTION PRODUCT WITH A BASE AND FORMING AN INSOLUBLE SULPHATE, SEPARATING THE INSOLUBLE SULPHATE, CONCENTREATING THE AQUEOUS SOLUTION TO CRYSTALLIZE THE ACRYLAMIDE FORMED, AND PURIFYING THE CRYSTALS OF ACRYLAMIDE, THE IMPROVEMENT COMPRISING ADDING A HYDROCARBON TO THE REACTION MEDIUM DURING THE HYDDROLYSIS STAGE, SAID HYDROCARBON BEING NON-MISCIBLE WITH WATER AND CAPABLE OF DISSOLVING ACRYLAMIDE, HEATING THE HYDROCARBON CONTAINING REACTION MEDIUM, SEPARATING THE HYDROCARBON PHASE, AND RECOVERING FROM SAID HYDROCARBON PHASE THE ACRYLAMIDE CRYSTALS, WHEREBY PURE CYRSTALS OF ACRYLAMIDE ARE OBTAINED DIRECTLY, WITH YIELDS OF AT LEAST 75% WITH RESPECT TO THE NITRILE INITIALLY EMPLOYED.
Claim 2
Dependent Claim
107 words
IN THE MANUFACTURE OF ACRYLAMIDE COMPRISING HYDROLIZING ACRYLONITRILE WITH SULPHURIC ACID, NEUTRALIZING THE REACTION PRODUCT WITH A BASE AND FORMING AN INSOLUBLE SULPHATE, SEPARATING THE INSOLUBLE SULPHATE, CONCENTREATING THE AQUEOUS SOLUTION TO CRYSTALLIZE THE ACRYLAMIDE FORMED, AND PURIFYING THE CRYSTALS OF ACRYLAMIDE, THE IMPROVEMENT COMPRISING ADDING A HYDROCARBON TO THE REACTION MEDIUM DURING THE HYDDROLYSIS STAGE, SAID HYDROCARBON BEING NON-MISCIBLE WITH WATER AND CAPABLE OF DISSOLVING ACRYLAMIDE, HEATING THE HYDROCARBON CONTAINING REACTION MEDIUM, SEPARATING THE HYDROCARBON PHASE, AND RECOVERING FROM SAID HYDROCARBON PHASE THE ACRYLAMIDE CRYSTALS, WHEREBY PURE CYRSTALS OF ACRYLAMIDE ARE OBTAINED DIRECTLY, WITH YIELDS OF AT LEAST 75% WITH RESPECT TO THE NITRILE INITIALLY EMPLOYED.
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) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |