US Patent No: 4,221,621

Number of patents in Portfolio can not be more than 2000

Process for preparing a foamed article of thermoplastic resin and a die therefor

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Abstract

A process and die are disclosed for preparing a foamed article of thermoplastic resin having a particular cross section configuration. The die of the invention is provided with a plurality of apertures in its face through which the resin is discharged. The apertures in the face of the die are distributed in a shape corresponding to the cross section of the foamed article which is produced. The apertures are further divided into a plurality of groups in which there is at least one zone which is void of apertures so that the apertures in the same group are actually restricted to a narrow band. The zone on the surface of the die which is void of apertures has a thickness more than twice the average distance between two adjacent apertures belonging to the same group.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SEKISUI KASEIHIN KOGYO KABUSHIKI KAISHANARA67

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujii, Motoji Nara, JP 1 12
Hayashi, Motoshige Nara, JP 14 218
Seki, Tatsujiro Funabashi, JP 1 12
Tsubone, Masahiro Ibaraki, JP 13 223

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Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
CRANE BUILDING PRODUCTS LLC (4)
6,578,368 Cryogenic cooling of extruded and compression molded materials 8 2001
6,708,504 Cooling of extruded and compression molded materials 19 2001
6,637,213 Cooling of extruded and compression molded materials 7 2002
7,017,352 Cooling of extruded and compression molded materials 6 2002
 
ALCAN BALTEK CORPORATION (1)
7,951,449 Polyester core materials and structural sandwich composites thereof 0 2002
 
COSTRUZIONI MECCANICHE LUIGI BANDERA S.P.A. (1)
6,676,395 Equipment for extruding an expanded polymer sheet or plate 1 2001
 
Diamond Stainless, Inc. (1)
6,413,073 Apparatus for producing stranded, ground, meat products 6 2001
 
SOLVAY (SOCIETE ANONYME) (1)
7,008,577 Extrusion head for expanded plastic tubes 0 2001
 
TECH-WOOD INTERNATIONAL LTD. (1)
7,241,484 Reinforced profile 0 2004
 
The Dow Chemical Company (1)
6,197,233 Method of forming low density strand foams 7 1998
 
TIMBERTECH LIMITED (1)
5,827,462 Balanced cooling of extruded synthetic wood material 29 1996
 
Other [Check patent profile for assignment information] (1)
4,781,773 Manufacturing containers from multilayered material 8 1987