US2864862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methylolacrylamide
Assignee: Wyeth Holdings LLC
•
Filing: 1956-08-30
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Granted: 1958-12-16
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Expires: 1976-08-30
Abstract
No abstract record available.
Inventors
- 👤 Sutherland George Leslie
- 👤 Desy Gustave Gerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:32
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
IN THE FUSION METHOD OF PREPARING SUBSTANTIALLY PURE CRYSTALLINE METHYLOLACRYLAMIDE BY DRY-MIXING CRYSTALLINE ACRYLAMIDE AND PARAFORMALDEHYDE IN THE PRESENCE OF A CATALYTIC AMOUNT OF A BASE UNREACTIVE IN THE MIXTURE WHEREIN THE FUSION REACTION IS INHIBITED, THE IMPROVEMENT WHICH COMPRISES: NEUTRALIZING THE ACID CONTENT OF THE ACRYLAMIDE WITH A STRONG BASE.
Claim 2
Dependent Claim
51 words
IN THE FUSION METHOD OF PREPARING SUBSTANTIALLY PURE CRYSTALLINE METHYLOLACRYLAMIDE BY DRY-MIXING CRYSTALLINE ACRYLAMIDE AND PARAFORMALDEHYDE IN THE PRESENCE OF A CATALYTIC AMOUNT OF A BASE UNREACTIVE IN THE MIXTURE WHEREIN THE FUSION REACTION IS INHIBITED, THE IMPROVEMENT WHICH COMPRISES: NEUTRALIZING THE ACID CONTENT OF THE ACRYLAMIDE WITH A STRONG BASE.
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) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |