Foam-containing structures
Patent 4471020 Issued on September 11, 1984. Estimated Expiration Date: 
July 22, 2002. 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.
July 22, 2002. 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 3286004 Foam-containing structures Method of producing a molded composite foam body provided with a cover layer and the resultant product Patent #: 4335182 InventorAssigneeApplicationNo. 06/400682 filed on 07/22/1982US Classes:428/309.9, With internal element bridging layers, nonplanar interface between layers, or intermediate layer of commingled adjacent foam layers156/245, In configured mold156/90, Utilizing layer to prevent migration or bleeding between laminae264/255, Sequential formation of portion on same mold or a preform surface264/257, One component is a fibrous or textile sheet, web, or batt264/46.6, Against inner surface of a hollow preform or solidified layer264/46.9, On a preform or solidified layer which is spherical, toroidal, or annular428/160, Polyurethane428/318.4, With nonvoid component of specified composition428/71, Foamed or expanded material encased428/76Complete cover or casingExaminersPrimary: Woo, Jay H.Assistant: Heitbrink, Tim Attorney, Agent or FirmInternational ClassesB29C 44/14 (20060101)B29C 44/02 (20060101) B29D 31/00 (20060101) Foreign Application Priority Data1981-08-28 GBAbstractThis invention relates to a method of making a foam-containing structure which includes placing and suitably retaining a respective first shaped sheet in each of first and second complementary parts of an open mould. Each sheet includes at least one layer of fibrous material. A further respective shaped sheet is placed and suitably retained upon each first sheet. Each said further sheet comprises a layer of fibrous material and an impervious membrane adhering thereto. When the two mould parts are closed together a foamable material is introduced into a cavity formed between the sheets and is then caused to expand, whereupon each membrane is caused to adhere to its adjacent first sheet but prevents penetration of the expanding material into that sheet. | |
