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US Patent 4528221 - Polystyrene foamed sheet suitable for forming
US Patent Issued on July 9, 1985
Estimated Patent Expiration Date:
May 10, 2003Estimated 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.
Estimated Patent Expiration Date:
May 10, 2003Estimated 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.AbstractA 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. | 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 reactantField of Search428/319.3, Synthetic resin or natural rubbers428/319.7, Linear or thermoplastic428/319.9, Hydrocarbon polymer428/215, Absolute thicknesses specified428/219, Weight per unit area specified428/220, Physical dimension specified428/318.6, Of about the same composition as, and adjacent to, the void-containing component428/339Including synthetic resin or polymer layer or componentExaminersPrimary: Van Balen, William J.Attorney, Agent or FirmUS Patent References3619344, 3861994, 4011357, Laminate of biaxially oriented polystyrene film and polystyrene foamIssued on: 03/08/1977 Inventor: Haase4101050, Filled-polystyrene laminates Issued on: 07/18/1978 Inventor: Buckler , et al.4426065, Continuous process for the production of polystyrene foamed articles Issued on: 01/17/1984 Inventor: Komatsuzaki , et al.4463861Sheet for forming sleeve and process for producing the same Issued on: 08/07/1984 Inventor: Tsubone , et al. International ClassesB32B 27/30 (20060101)B65D 1/22 (20060101) B65D 1/28 (20060101) Foreign Application Priority Data1982-05-11 JP |
