US3170951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of sulfo-n-alkylpropionamides
Assignee: Wyeth Holdings LLC
•
Filing: 1963-05-23
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Granted: 1965-02-23
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Expires: 1983-05-23
Abstract
No abstract record available.
Inventors
- 👤 Sheers Edward Helmut
- 👤 Sexsmith David Randal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:52
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/02; C07C309/03; C07C309/17; C07C309/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A PROCESS WHICH COMPRISES REACTING AN N-ALKYLACRYLAMIDE IN WHICH THE ALKYL GROUP CONTAINS AT LEAST 10 CARBON ATOMS WITH AN ALKALI BISULFITE WHILE MAINTAINING A PH OF AT LEAST 7.5 TO PREPARE SULFONATED N-ALKYLACRYLAMIDE RELATIVELY FREE OF POLYMER.
Claim 2
Dependent Claim
38 words
A PROCESS WHICH COMPRISES REACTING AN N-ALKYLACRYLAMIDE IN WHICH THE ALKYL GROUP CONTAINS AT LEAST 10 CARBON ATOMS WITH AN ALKALI BISULFITE WHILE MAINTAINING A PH OF AT LEAST 7.5 TO PREPARE SULFONATED N-ALKYLACRYLAMIDE RELATIVELY FREE OF POLYMER.
References Cited (Backward Citations)
US2576501A
Cited
US2573673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |