Patent US2683173A successfully refreshed from Google Patents.
US2683173A
Expired / Lapsed
US
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Amide preparation
Assignee: Hercules Powder Co
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Filing: 1948-12-11
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Granted: 1954-07-06
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Expires: 1968-12-11
Abstract
No abstract record available.
Inventors
- 👤 Cyrus A Weisgerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:22
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/02; C07C233/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
THE PROCESS FOR RECOVERING A MONOMERIC AMIDE FROM A SULFURIC ACID HYDROLYSIS MIXTURE CONTAINING PREDOMINANTLY A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE-, METHACRYLAMIDE- AND A-CHLOROACRYLAMIDE SULFATE, WHICH COMPRISES FORMING A HYDRATE OF SODIUM SULFATE BY NEUTRALIZING SAID MIXTURE WITH SUBSTANTIALLY ANHYDROUS SODIUM CARBONATE IN THE PRESENCE OF A SIGNIFICANT AMOUNT OF WATER BUT LESS THAN THAT NECESSARY TO COMPLETELY HYDRATE ALL THE SODIUM SULFATE FORMED DURING THE NEUTRALIZATION REACTION AND ISOLATING SUBSTANTIALLY MONOMERIC AMIDE THEREFROM.
Claim 2
Dependent Claim
77 words
THE PROCESS FOR RECOVERING A MONOMERIC AMIDE FROM A SULFURIC ACID HYDROLYSIS MIXTURE CONTAINING PREDOMINANTLY A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE-, METHACRYLAMIDE- AND A-CHLOROACRYLAMIDE SULFATE, WHICH COMPRISES FORMING A HYDRATE OF SODIUM SULFATE BY NEUTRALIZING SAID MIXTURE WITH SUBSTANTIALLY ANHYDROUS SODIUM CARBONATE IN THE PRESENCE OF A SIGNIFICANT AMOUNT OF WATER BUT LESS THAN THAT NECESSARY TO COMPLETELY HYDRATE ALL THE SODIUM SULFATE FORMED DURING THE NEUTRALIZATION REACTION AND ISOLATING SUBSTANTIALLY MONOMERIC AMIDE THEREFROM.
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) | 1957-07-05 | 1958-01-04 | 1958-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-05 | 1962-01-04 | 1962-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-05 | 1966-01-04 | 1966-07-06 | $7700.00 | Window Closed / Lapsed |