Patent US3088939A successfully refreshed from Google Patents.
US3088939A
Expired / Lapsed
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Method of making a crystallizable polymer with lithium as catalyst
Assignee: Wyeth Holdings LLC
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Filing: 1957-07-26
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Granted: 1963-05-07
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Expires: 1977-07-26
Abstract
No abstract record available.
Inventors
- 👤 Mary L Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:15
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/12; C08F20/16; C08F20/18; C08F20/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A METHOD OF PREPARING CRYSTALLIZABLE POLYMERS WHICH COMPRISES MIXING A MONOMERIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACRYLONITRILE, METHACRYLONITRILE, TERTIARY BUTYL ACRYLATE AND TERTIARY BUTYL METHACRYLATE WITH A CATALYST SYSTEM CONSISTING ESSENTIALLY OF LITHIUM METAL, IN A FINELY DISPERSED CONDITION AND HAVING A PARTICLE SIZE NOT EXCEEDING 200 MICRONS, IN AMOUNTS OF FROM ABOUT 0.01% TO 5%, BASED ON THE WEIGHT OF SAID MONOMERIC COMPOUND, AND POLYMERIZING SAID MIXTURE IN AN INERT ATMOSPHERE, WHEREIN THE MONOMERIC COMPOUND IS DISSOLVED IN AN ORGANIC MEDIUM WHICH IS A SOLVENT FOR SAID COMPOUND AND SUBSTANTIALLY A NONSOLVENT FOR THE POLYMER OF SAID COMPOUND.
Claim 2
Independent Claim
101 words
A METHOD OF PREPARING CRYSTALLIZABLE POLYMERS WHICH COMPRISES MIXING A MONOMERIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACRYLONITRILE, METHACRYLONITRILE, TERTIARY BUTYL ACRYLATE AND TERTIARY BUTYL METHACRYLATE WITH A CATALYST SYSTEM CONSISTING ESSENTIALLY OF LITHIUM METAL, IN A FINELY DISPERSED CONDITION AND HAVING A PARTICLE SIZE NOT EXCEEDING 200 MICRONS, IN AMOUNTS OF FROM ABOUT 0.01% TO 5%, BASED ON THE WEIGHT OF SAID MONOMERIC COMPOUND, AND POLYMERIZING SAID MIXTURE IN AN INERT ATMOSPHERE, WHEREIN THE MONOMERIC COMPOUND IS DISSOLVED IN AN ORGANIC MEDIUM WHICH IS A SOLVENT FOR SAID COMPOUND AND SUBSTANTIALLY A NONSOLVENT FOR THE POLYMER OF SAID COMPOUND.
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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) | 1966-05-06 | 1966-11-05 | 1967-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-06 | 1970-11-05 | 1971-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-06 | 1974-11-05 | 1975-05-07 | $7700.00 | Window Closed / Lapsed |