Diaphragm and method for producing same
Patent 5180785 Issued on January 19, 1993. Estimated Expiration Date: 
October 23, 2010. 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.
October 23, 2010. 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 ReferencesMolding composition Polyethylene composition Speaker Patent #: 5022084 InventorsAssigneeApplicationNo. 601391 filed on 10/23/1990US Classes:525/240, Solid polymer derived from ethylene or propylene181/169, Fibrous material381/184, Different types of diaphragms381/426, Critically defined material or lamination525/324Acyclic hydrocarbon is ethyleneExaminersPrimary: Schofer, Joseph L.Assistant: Weber, Tom Attorney, Agent or FirmForeign Patent References
International ClassesC08L 023/08G10K 013/00 Foreign Application Priority Data1989-10-23 JPAbstractA diaphragm formed of a material for molding mainly composed of a uniform mixture of an ultra-high molecular weight polyolefin with a high melting viscosity and a polyolefin with a lower melting viscosity, wherein the ultra-high molecular weight polyolefin is extensively oriented by the lubricating action of polyolefin having the lower melting viscosity and the method for producing the diaphragm. The diaphragm superior in specific modulus of elasticity and internal losses may be produced by producing the polyolefin composition by multi-stage polymerization and injection molding the composition for radially orienting the molecular chains of the ultra-high molecular weight polyolefin. | |
