Patent US3215680A successfully refreshed from Google Patents.
US3215680A
Expired / Lapsed
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Polymeric composition and process for preparing the same
Assignee: Wyeth Holdings LLC
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Filing: 1962-04-12
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Granted: 1965-11-02
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Expires: 1982-04-12
Abstract
No abstract record available.
Inventors
- 👤 Edwin R Kolodny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:04
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR PRODUCING A DRY WATER-SOLUBLE POLYMERIC COMPOSITION OF MATTER COMPRISING POLYMERIZING ACRYLAMIDE IN AN AQUEOUS MEDIUM IN THE PRESENCE OF A POLYMERIZATION CATALYST AND IN THE PRESENCE OF FROM ABOUT 10% TO ABOUT 80% BY WEIGHT OF A WATER-SOLUBLE MONOVALENT INORGANIC SALT OF AN INORGANIC ACID AND DRYING THE RESULTING POLYMERIC COMPOSITION SO AS TO REMOVE SUBSTANTIALLY ALL OF THE WATER FROM SAID POLYMERIC COMPOSITION, WHEREIN SAID PERCENTAGES BY WEIGHT ARE BASED ON THE TOTAL WEIGHT OF SAID ACRYLAMIDE AND SAID SALT WHEREIN SAID SALT IS INERT WITH RESPECT TO THE POLYMERIZATION REACTION.
Claim 2
Dependent Claim
95 words
A PROCESS FOR PRODUCING A DRY WATER-SOLUBLE POLYMERIC COMPOSITION OF MATTER COMPRISING POLYMERIZING ACRYLAMIDE IN AN AQUEOUS MEDIUM IN THE PRESENCE OF A POLYMERIZATION CATALYST AND IN THE PRESENCE OF FROM ABOUT 10% TO ABOUT 80% BY WEIGHT OF A WATER-SOLUBLE MONOVALENT INORGANIC SALT OF AN INORGANIC ACID AND DRYING THE RESULTING POLYMERIC COMPOSITION SO AS TO REMOVE SUBSTANTIALLY ALL OF THE WATER FROM SAID POLYMERIC COMPOSITION, WHEREIN SAID PERCENTAGES BY WEIGHT ARE BASED ON THE TOTAL WEIGHT OF SAID ACRYLAMIDE AND SAID SALT WHEREIN SAID SALT IS INERT WITH RESPECT TO THE POLYMERIZATION REACTION.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |