Patent US3104332A successfully refreshed from Google Patents.
Patent US3032518A successfully refreshed from Google Patents.
US3032518A
Expired / Lapsed
US
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Process for polymerizing vinyl monomers in the presence of polymeric reducing agent and mixture of gases
Assignee: Wyeth Holdings LLC
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Filing: 1959-01-14
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Granted: 1962-05-01
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Expires: 1979-01-14
Abstract
No abstract record available.
Inventors
- 👤 Nicholas R Segro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:33
CPC Classifications
C; C08; C08F; C08F291/00; Y; Y10; Y10S; Y10S8/00; Y10S8/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS COMPRISING POLYMERIZING IN AN AQUEOUS MEDIUM, AT A PH NOT GREATER THAN 3.5, AN ALKYL ESTER OF AN ACRYLIC ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC AND METHACRYLIC ACIDS WHEREIN SAID ALKYL GROUP CONTAINS BETWEEN 1 AND 8 CARBON ATOMS IN THE PRESENCE OF A POLYMERIC REDUCING AGENT CONTAINING AN ALCOHOLIC HYDROXY GROUP, UTILIZING AN OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF CERIC SALTS AND COBALTIC SALTS AND MAINTAINING IN THE SPHERE OF POLYMERIZATION A MIXTURE OF AN INERT GAS AND OXYGEN, SAID MIXTURE CONTAINING FROM ABOUT 0.75% AND 2.1% BY VOLUME OF OXYGEN BASED ON THE TOTAL VOLUME OF GASES UTILIZED.
Claim 2
Dependent Claim
106 words
A PROCESS COMPRISING POLYMERIZING IN AN AQUEOUS MEDIUM, AT A PH NOT GREATER THAN 3.5, AN ALKYL ESTER OF AN ACRYLIC ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC AND METHACRYLIC ACIDS WHEREIN SAID ALKYL GROUP CONTAINS BETWEEN 1 AND 8 CARBON ATOMS IN THE PRESENCE OF A POLYMERIC REDUCING AGENT CONTAINING AN ALCOHOLIC HYDROXY GROUP, UTILIZING AN OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF CERIC SALTS AND COBALTIC SALTS AND MAINTAINING IN THE SPHERE OF POLYMERIZATION A MIXTURE OF AN INERT GAS AND OXYGEN, SAID MIXTURE CONTAINING FROM ABOUT 0.75% AND 2.1% BY VOLUME OF OXYGEN BASED ON THE TOTAL VOLUME OF GASES UTILIZED.
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) | 1965-04-30 | 1965-10-30 | 1966-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-30 | 1969-10-30 | 1970-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-30 | 1973-10-30 | 1974-05-01 | $7700.00 | Window Closed / Lapsed |