Patent US2984648A successfully refreshed from Google Patents.
US2984648A
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Color inhibition of styrene-acrylonitrile copolymers by polymerization of monomers in presence of a phenol and free radical agent
Assignee: Monsanto Chemicals Ltd
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Filing: 1956-03-05
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Granted: 1961-05-16
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Expires: 1976-03-05
Abstract
No abstract record available.
Inventors
- 👤 Forrest V Williams
- 👤 Robert A Ruehrwein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:02
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F212/10; C08K; C08K5/00; C08K5/04; C08K5/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A PROCESS FOR INHIBITING THE DISCOLORATION OF STYRENE COPOLYMERS WITH ACRYLONITRILE WHICH COMPRISES POLYMERIZING THE MONOMERS OF THE SAID POLYMERS IN THE PRESENCE OF 0.001% TO 1% OF A PHENOL SELECTED FROM THE GROUP CONSISTING OF:
Claim 2
Dependent Claim
36 words
A PROCESS FOR INHIBITING THE DISCOLORATION OF STYRENE COPOLYMERS WITH ACRYLONITRILE WHICH COMPRISES POLYMERIZING THE MONOMERS OF THE SAID POLYMERS IN THE PRESENCE OF 0.001% TO 1% OF A PHENOL SELECTED FROM THE GROUP CONSISTING OF:
References Cited (Backward Citations)
CA520923A
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US2452669A
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US2500780A
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US2566537A
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US2679493A
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US2698312A
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US2726226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-15 | 1964-11-14 | 1965-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-15 | 1968-11-14 | 1969-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-15 | 1972-11-14 | 1973-05-16 | $7700.00 | Window Closed / Lapsed |