US Patent No: 5,362,436

Number of patents in Portfolio can not be more than 2000

Polystyrene foam sheet useful for forming deep drawn articles, a process to produce those articles, and the deep drawn articles

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A polystyrene foam sheet comprising a polystyrene resin which contains 1 to 15 wt % of a rubber component having a majority of particle sizes less than about 0.45 microns has been found to be superior for forming deep drawn articles. Optionally one or two films may be extrusion coated or laminated to the foam sheet prior to thermoforming. Also disclosed is a method for thermoforming the foam sheet. Preheat the sheet, clamp the sheet between the matched male and female mold members, move the members into final position while applying a vacuum through both members to both sides of the foamed sheet and then chill formed foam to set a final shape.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SOLO CUP OPERATING CORPORATIONHIGHLAND PARK, IL173

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Wagner, Phillip A Bay City, MI 6 65

Cited Art Landscape

Patent Info (Count) # Cites Year
 
TENNECO PLASTICS COMPANY (2)
4,239,727 Method and apparatus for thermoforming thermoplastic foam articles 29 1978
4,359,160 Nestable foam cup with improved heat retention and the process for its manufacture 38 1980
 
ASAHI KOGAKU KOGYO KABUSHIKI KAISHA (1)
5,039,714 Rubber-modified polystyrene resin composition 18 1989
 
BASF AKTIENGESELLSCHAFT (1)
4,493,922 Impact-resistant thermoplastic molding material 32 1984
 
BAYER ANTWERPEN SA/NV (1)
4,214,056 Method for preparing a monoalkenyl aromatic polyblend having a dispersed rubber phase as particles with a bimodal particle size distribution 19 1979
 
Sekisui Kaseihin Kogyo Kabushiki Kaisha (1)
4,528,221 Polystyrene foamed sheet suitable for forming 43 1983

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
AIRDEX INTERNATIONAL, INC. (12)
7,927,677 Method of making a dunnage platform 2 2006
7,611,596 Method of making a dunnage platform 3 2006
7,923,087 Dunnage Platform 2 2006
7,544,262 Method of making a dunnage platform 3 2006
7,963,397 Modular, knock-down, light weight, thermally insulating, tamper proof shipping container and fire retardant shipping container bag 1 2007
7,689,481 Light weight, strong, fire retardant dunnage platform bag and system of loading, dispensing and using bag 3 2007
8,142,589 Method of making a dunnage platform 0 2009
8,244,602 Method for making a dunnage platform 0 2009
8,224,719 Light weight, strong, fire retardant dunnage platform bag and system of loading, dispensing and using bag 0 2009
8,163,363 Dunnage platform 0 2011
8,224,721 Lightweight dunnage platform 0 2011
8,672,137 Modular, knock down, light weight, thermally insulating, tamper proof cargo container 0 2011
 
PACTIV LLC (10)
7,814,647 Reinforced plastic foam cup, method of and apparatus for manufacturing same 1 2005
7,704,347 Reinforced plastic foam cup, method of and apparatus for manufacturing same 5 2005
7,694,843 Reinforced plastic foam cup, method of and apparatus for manufacturing same 7 2005
7,552,841 Reinforced plastic foam cup, method of and apparatus for manufacturing same 22 2005
7,536,767 Method of manufacturing a reinforced plastic foam cup 11 2005
7,818,866 Method of reinforcing a plastic foam cup 2 2006
7,918,005 Reinforced foam cup, method of and apparatus for manufacturing same 1 2009
8,087,147 Method of reinforcing a plastic foam cup 1 2010
7,918,016 Reinforced plastic foam cup, method of and apparatus for manufacturing same 2 2010
8,622,208 Reinforced cup 0 2011
 
MICROGREEN POLYMERS, INC. (2)
8,377,548 Multi-layered foamed polymeric objects and related methods 0 2010
8,517,709 Methods and pressure vessels for solid-state microcellular processing of thermoplastic rolls or sheets 0 2011
 
Convenience Food Systems B.V. (1)
6,203,751 Method and apparatus for producing open containers from foam sheeting 6 1998
 
Insul-Stop, Inc. (1)
5,506,048 Insulation barrier and a method of making a fire-retardant insulation barrier 4 1995
 
PAVILION SERVICES LLC (1)
5,958,470 Vacuum forming apparatus for forming a three-dimensional surface article 3 1997
 
SEALED AIR CORPORATION (US) (1)
6,245,266 Method for making oriented polyethylene foam and foam produced thereby 6 1999
 
Styro-Stop, Inc. (1)
5,516,552 Insulation barrier and a method of making and insulation barrier for a roof insulation system 7 1995
 
Other [Check patent profile for assignment information] (1)
5,976,288 Method of forming a molded, multi-layer structure 6 1997