US2940952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of block copolymers
Assignee: Wyeth Holdings LLC
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Filing: 1957-06-10
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Granted: 1960-06-14
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Expires: 1977-06-10
Abstract
No abstract record available.
Inventors
- 👤 Mary L Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:22
CPC Classifications
C; C08; C08F; C08F293/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A METHOD OF PREPARING BLOCK COPOLYMERS WHICH COMPRISES DISSOLVING A MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ACID, METHACRYLIC ACID, ACRYLONITRILE AND METHACRYLONITRILE, IN AN ORGANIC BROMINE COMPOUND HAVING FROM 1 TO 4 CARBON ATOMS AND HAVING THREE BROMINE ATOMS ON THE SAME CARBON ATOM GENERATING FREE RADICALS BY DECOMPOSING SAID BROMINE COMPOUND WITH A LIGHT SOURCE SUPPLYING RADIATION HAVING A WAVE LENGTH BAND INCLUDING BUT NOT LESS THAN 3100 ANGSTROM UNITS, UTILIZING THE FREE RADICALS GENERATED TO ACTIVATE POLYMERIZATION OF SAID MONOMER, SEPARATING THE RESULTING BROMINECONTAINING POLYMER, DISSOLVING SAID POLYMER IN AN INERT AQUEOUS SOLVENT TOGETHER WITH A DISSIMILAR VINYL MONOMER, SAID DISSIMILAR VINYL MONOMER BEING CHARACTERIZED BY HAVING AT LEAST 5% SOLUBILITY IN AQUEOUS MEDIA, AND EFFECTING COPOLYMERIZATION OF SAID POLYMER AND SAID MONOMER WITH A LIGHT SOURCE HAVING A WAVE LENGTH BAND INCLUDING BUT NOT LESS THAN 2800 ANGSTROM UNITS.
Claim 2
Independent Claim
144 words
A METHOD OF PREPARING BLOCK COPOLYMERS WHICH COMPRISES DISSOLVING A MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ACID, METHACRYLIC ACID, ACRYLONITRILE AND METHACRYLONITRILE, IN AN ORGANIC BROMINE COMPOUND HAVING FROM 1 TO 4 CARBON ATOMS AND HAVING THREE BROMINE ATOMS ON THE SAME CARBON ATOM GENERATING FREE RADICALS BY DECOMPOSING SAID BROMINE COMPOUND WITH A LIGHT SOURCE SUPPLYING RADIATION HAVING A WAVE LENGTH BAND INCLUDING BUT NOT LESS THAN 3100 ANGSTROM UNITS, UTILIZING THE FREE RADICALS GENERATED TO ACTIVATE POLYMERIZATION OF SAID MONOMER, SEPARATING THE RESULTING BROMINECONTAINING POLYMER, DISSOLVING SAID POLYMER IN AN INERT AQUEOUS SOLVENT TOGETHER WITH A DISSIMILAR VINYL MONOMER, SAID DISSIMILAR VINYL MONOMER BEING CHARACTERIZED BY HAVING AT LEAST 5% SOLUBILITY IN AQUEOUS MEDIA, AND EFFECTING COPOLYMERIZATION OF SAID POLYMER AND SAID MONOMER WITH A LIGHT SOURCE HAVING A WAVE LENGTH BAND INCLUDING BUT NOT LESS THAN 2800 ANGSTROM UNITS.
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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |