Patent NL75920C successfully refreshed from Google Patents.
Patent US2976263A successfully refreshed from Google Patents.
US2976263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state polymerization
Assignee: Wyeth Holdings LLC
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Filing: 1959-01-06
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Granted: 1961-03-21
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Expires: 1979-01-06
Abstract
No abstract record available.
Inventors
- 👤 Jen Yun
- 👤 Janet L Johnson
- 👤 Romeo R Aloia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:13
CPC Classifications
C; C08; C08F; C08F265/00; C08F265/10; Y; Y10; Y10S; Y10S526/00; Y10S526/922
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
IN A PROCESS FOR PREPARISNG 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 AND MIXTURES OF SAID ACRYLAMIDES WITH ACRYLIC ACID AND METHACRYLIC ACID WITHS 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 110*C., THE IMPROVEMENT WHICH COMPRISES CONDUCTING SAID POLYMERIZATION IN THE PRESENCE OF FROM ABOUT 0.5% TO ABUT 15% OF SOLID POWDERED PREFORMED POLYMER OF SAID VINYL MONOMERS SUSPENDED IN SAID MEDIUM.
Claim 2
Dependent Claim
124 words
IN A PROCESS FOR PREPARISNG 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 AND MIXTURES OF SAID ACRYLAMIDES WITH ACRYLIC ACID AND METHACRYLIC ACID WITHS 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 110*C., THE IMPROVEMENT WHICH COMPRISES CONDUCTING SAID POLYMERIZATION IN THE PRESENCE OF FROM ABOUT 0.5% TO ABUT 15% OF SOLID POWDERED PREFORMED POLYMER OF SAID VINYL MONOMERS SUSPENDED IN SAID MEDIUM.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |