US Patent No: 4,904,512
Number of patents in Portfolio can not be more than 2000
Compression-molded article having multilayer structure
Stats
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Feb 27, 1990
Issued date -
Feb 2, 1987
filing date -
07/009,974
serial no -
Expired
status
Importance
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Abstract
A multilayer compression-molded article produced by compression-molding a composite plastic material. The composite plastic material comprises a first synthetic resin and a second synthetic resin in which the first synthetic resin surrounds substantially the entire second synthetic resin. The compression-molded article comprises a first resin layer molded from the first synthetic resin and a second resin layer molded from the second synthetic resin in which the first resin layer surrounds substantially the entire second resin layer. The composite plastic material is obtained by an extrusion apparatus which intermittently extrudes the second synthetic resin via a subsidiary extrusion flow passage into a main extrusion flow passage in which the first synthetic resin flows.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,526,821 Multi-layer container and method of making same | 39 | 1979 | |
| 4,525,134 Apparatus for making a multi-layer injection blow molded container | 53 | 1981 | |
| 4,568,261 Apparatus for making a multi-layer injection blow molded container | 23 | 1985 | |
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| 4,572,856 Composite molded article and process using self-positioning laminated stiffener | 30 | 1984 | |
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| 4,497,765 Process for making a closure | 127 | 1982 | |
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| 7,201,123 Method and device for operating an internal combustion engine of a vehicle | 3 | 2004 | |
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| 4,528,221 Polystyrene foamed sheet suitable for forming | 41 | 1983 | |
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| 4,663,226 Fire retardant | 21 | 1986 | |