Patent US3201198A successfully refreshed from Google Patents.
US3201198A
Expired / Lapsed
US
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Process for simultaneous production of methacrylamide and ammonium bisulfate
Assignee: Evonik Operations GmbH
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Filing: 1962-04-09
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Granted: 1965-08-17
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Expires: 1982-04-09
Abstract
No abstract record available.
Inventors
- 👤 Huter Ludwig
- 👤 Reichau Ulrich
- 👤 Rinn Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:54
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/24; C01C1/245; C01C1/242; C07; C07C; C07C233/00; C07C233/01; C07C233/02; C07C233/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR THE SIMULTANEOUS PRODUCTION OF METHACRYLAMIDE AND AMMONIUM BISULFATE WHICH COMPRISES CONTACTING A COMPLETELY REACTED REACTION MIXTURE OF ABOUT EQUIVALENT QUANTITIES OF ACETONE CYANHYDRIN AND SULFURIC ACID WITH ABOUT 1/2 AN EQUIVALENT OF AMMONIA WITH REFERENCE TO SAID SULFURIC ACID IN THE PRESENCE OF UP TO 0.5 MOL OF WATER PER MOL OF ORIGINAL ACETONE CYANHYDRIN AND SEPARATING THE RESULTING METHACRYLAMIDE AND AMMONIUM BISULFATE PHASES THE FORMATION OF THE METHACRYLAMIDE AND AMMONIUM BISULFATE AND THE SEPARATION OF THE PHASES BEING CARRIED OUT AT A TEMPERATURE BETWEEN 100 AND 180* C. AT WHICH THE COMPONENTS OF THE REACTION MIXTURE ARE IN THE LIQUID PHASE.
Claim 2
Dependent Claim
105 words
A PROCESS FOR THE SIMULTANEOUS PRODUCTION OF METHACRYLAMIDE AND AMMONIUM BISULFATE WHICH COMPRISES CONTACTING A COMPLETELY REACTED REACTION MIXTURE OF ABOUT EQUIVALENT QUANTITIES OF ACETONE CYANHYDRIN AND SULFURIC ACID WITH ABOUT 1/2 AN EQUIVALENT OF AMMONIA WITH REFERENCE TO SAID SULFURIC ACID IN THE PRESENCE OF UP TO 0.5 MOL OF WATER PER MOL OF ORIGINAL ACETONE CYANHYDRIN AND SEPARATING THE RESULTING METHACRYLAMIDE AND AMMONIUM BISULFATE PHASES THE FORMATION OF THE METHACRYLAMIDE AND AMMONIUM BISULFATE AND THE SEPARATION OF THE PHASES BEING CARRIED OUT AT A TEMPERATURE BETWEEN 100 AND 180* C. AT WHICH THE COMPONENTS OF THE REACTION MIXTURE ARE IN THE LIQUID PHASE.
References Cited (Backward Citations)
US3027328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |