US2953546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of solid monomers in suspension
Assignee: Wyeth Holdings LLC
•
Filing: 1957-03-11
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Granted: 1960-09-20
•
Expires: 1977-03-11
Abstract
No abstract record available.
Inventors
- 👤 Walter M Thomas
- 👤 Henry Z Friedlander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:29
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/02; C08F18/04; C08F2/00; C08F2/12; C08F2/14; C08F20/00; C08F20/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PROCESS FOR PREPARING SOLID POLYMERS WHICH COMPRISES POLYMERIZING VINYL MONOMERS HAVING A MELTING POINT ABOVE 35*C. AND SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE, METHYLOL ACRYLAMIDE, METHACRYLAMIDE, METHYLENE BISACRYLAMIDE, VINYL CARBAZOLE, VINYL STEARATE, ACTYLIC ACID METHACRYLIC ACID, POTSSIUM, CALCIUM AND BARIUM SALTS OF SAID ACIDS, AND ALLYL AMINE SALTS WITH A FREE RADICAL POLYMERIZATION CATALYST IN THE SOLID STATE AND BELOW THEIR MELTING POINT, SAID POLYMERIZATION BEING CONDUCTED IN A NON-AQUEOUS MEDIUM, SAID MEDIUM BEING AN INERT LIQUID ORGANIC NONSOLVENT FOR SAID MONOMERS AND FOR SAID POLYMERS AND HAVING A BOILING POINT IN THE RANGE OF FROM ABOUT 50*C. TO ABOUT 110*C.
Claim 2
Dependent Claim
103 words
A PROCESS FOR PREPARING SOLID POLYMERS WHICH COMPRISES POLYMERIZING VINYL MONOMERS HAVING A MELTING POINT ABOVE 35*C. AND SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE, METHYLOL ACRYLAMIDE, METHACRYLAMIDE, METHYLENE BISACRYLAMIDE, VINYL CARBAZOLE, VINYL STEARATE, ACTYLIC ACID METHACRYLIC ACID, POTSSIUM, CALCIUM AND BARIUM SALTS OF SAID ACIDS, AND ALLYL AMINE SALTS WITH A FREE RADICAL POLYMERIZATION CATALYST IN THE SOLID STATE AND BELOW THEIR MELTING POINT, SAID POLYMERIZATION BEING CONDUCTED IN A NON-AQUEOUS MEDIUM, SAID MEDIUM BEING AN INERT LIQUID ORGANIC NONSOLVENT FOR SAID MONOMERS AND FOR SAID POLYMERS AND HAVING A BOILING POINT IN THE RANGE OF FROM ABOUT 50*C. TO ABOUT 110*C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |