Patent US3862998A successfully refreshed from Google Patents.
US3862998A
Expired / Lapsed
US
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Mixture of a polycarbonate and a styrene maleic acid anhydride copolymer
Assignee: Bayer AG
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Filing: 1973-10-25
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Granted: 1975-01-28
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Expires: 1993-10-25
Abstract
Abstract Thermoplastic moulding compositions and shaped articles made therefrom of mixtures of A. 5 TO 95 PERCENT BY WEIGHT OF A POLYCARBONATE OF DIVALENT PHENOLS AND B. 95 TO 5 PERCENT BY WEIGHT OF A STYRENE/MALEIC ACID ANHYDRIDE COPOLYMER HAVING IMPROVED STABILITY TO BOILING WATER AND IMPROVED FLOW PROPERTIES.
Inventors
- 👤 Michael Koehler
- 👤 Salah Elabd Elghani
- 👤 Richard Prinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
C; C08; C08L; C08L35/00; C08L35/06; C08L69/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
57 words
A THERMOPLASTIC MOULDING COMPOSITION CONSISTING ESSENTIALLY OF A MIXTURE OF (A) FROM 5-95 PERCENT BY WEIGHT OF A POLYCARBONATE OF ADIHYDRIC PHENOL AND A DERIVATIVE OF CARBONIC ACID (B) FROM 95 TO 5 PERCENT BY WEIGHT OF A COPOLYMER OF STYRENE AND MALEIC ACID ANHYDRIDE CONTAINING FROM 5 TO 50 PERCENT BY WEIGHT OF MALEIC ACID ANHYDRIDE.
Claim 2
Dependent Claim
57 words
A THERMOPLASTIC MOULDING COMPOSITION CONSISTING ESSENTIALLY OF A MIXTURE OF (A) FROM 5-95 PERCENT BY WEIGHT OF A POLYCARBONATE OF ADIHYDRIC PHENOL AND A DERIVATIVE OF CARBONIC ACID (B) FROM 95 TO 5 PERCENT BY WEIGHT OF A COPOLYMER OF STYRENE AND MALEIC ACID ANHYDRIDE CONTAINING FROM 5 TO 50 PERCENT BY WEIGHT OF MALEIC ACID ANHYDRIDE.
Claim 3
Dependent Claim
27 words
A moulding composition as claimed in claim 1 in which the polycarbonate is based on bisphenol A, tetrachlorobisphenol A, tetrabromobisphenol A, tetramethylbisphenol A or a trinuclear bisphenol.
Claim 4
Dependent Claim
20 words
A composition as claimed in claim 1 in which the polycarbonate has a molecular weight of from 10,000 to 100,000.
Claim 5
Dependent Claim
20 words
A composition as claimed in claim 1 in which said copolymer has a molecular weight of from 2,000 to 300,000.
Claim 6
Dependent Claim
20 words
A composition as claimed in claim 4 in which the copolymer has a molecular weight of from 80,000 to 200,000.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |