Polystyrene foamed sheet suitable for forming
Patent 4528221 Issued on July 9, 1985. Estimated Expiration Date: 
May 10, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 10, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3619344 3861994 Laminate of biaxially oriented polystyrene film and polystyrene foam Filled-polystyrene laminates Continuous process for the production of polystyrene foamed articles Sheet for forming sleeve and process for producing the same Patent #: 4463861 InventorsAssigneeApplicationNo. 06/493290 filed on 05/10/1983US Classes:428/36.5, Foam or porous material containing428/215, Absolute thicknesses specified428/220, Physical dimension specified428/318.6, Of about the same composition as, and adjacent to, the void-containing component428/319.9, Hydrocarbon polymer428/339, Including synthetic resin or polymer layer or component428/910, PRODUCT WITH MOLECULAR ORIENTATION521/139At least one polymer is derived from an ethylenically unsaturated aromatic reactant or wherein the polymer-forming system contains the same type of reactantExaminersPrimary: Van Balen, William J.Attorney, Agent or FirmInternational ClassesB32B 27/30 (20060101)B65D 1/22 (20060101) B65D 1/28 (20060101) Foreign Application Priority Data1982-05-11 JPAbstractA polystyrene foamed sheet suitable for thermoforming and containers such as cups or trays formed therefrom, the foamed sheet comprising a polystyrene resin as the base resin which contains a specific quantity of each a rubber component and a filler, having specific bulk density, thickness, stretch ratio and residual gas quantity, and said sheet being preferably laminated with a film.Field of SearchSynthetic resin or natural rubbersLinear or thermoplastic Hydrocarbon polymer Absolute thicknesses specified Weight per unit area specified Physical dimension specified Of about the same composition as, and adjacent to, the void-containing component Including synthetic resin or polymer layer or component | |
