Patent US3629387A successfully refreshed from Google Patents.
US3629387A
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Process for producing improved impactresistant polystyrene films
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1969-04-14
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Granted: 1971-12-21
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Expires: 1989-04-14
Abstract
Abstract PROCESS FOR PRODUCING CONTINUOUSLY IN A STABLE OPERATION IMPROVED, RUBBER-MODIFIED POLYSTYRENE FILMS WHICH ARE HIGH IN TENSILE STRENGTH, IMPACT STRENGTH, TEARING STRENGTH, TRANSPARENCY AND SURFACE SMOOTHNESS AND WHICH ARE VERY READILY THERMOFORMED COMPRISING EXTRUDING A RUBBER-MODIFIED POLYSTYRENE IN WHICH THE AMOUNT OF CONTAINED RUBBER AND THE PARTICLE SIZE OF THE RUBBER, A COPOLYMER OF THIS RUBBER AND A VINYL AROMATIC COMPOUND OR A MIXTURE OF THE RUBBER AND COPOLYMER CONTAINED BY THE POLYSTYRENE ARE IN A SPECIFIED RELATIONSHIP, USING SPECIAL EXTRUSION CONDITIONS IN A TUBULAR-FILM EXTRUSION PROCESS WHICH INCLUDES BIAXIALLY STRETCHING UNDER SPECIFIED CONDITIONS.
Inventors
- 👤 Takeshi Watanabe
- 👤 Masatsugu Yoshida
- 👤 Takaichi Akutagawa
- 👤 Shiro Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:35
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/002; C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; B29C48/00; B29C48/001; B29C48/0017; B29C48/0018; B29C48/0019; B29C48/03; B29C48/09; B29C48/10; C08L51/00; C08L51/04; C08L53/00; C08L53/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |