Paper cone for cone type speaker
Patent 5256837 Issued on October 26, 1993. Estimated Expiration Date: 
October 30, 2011. 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 30, 2011. 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 1748990 1798688 1917013 Electro-acoustic transducer diaphragms Loudspeaker Patent #: 4100992 InventorApplicationNo. 787319 filed on 10/30/1991US Classes:181/164, Sectional diaphragm181/166, With damping means181/169Fibrous materialExaminersPrimary: Gellner, Michael L.Assistant: Lee, Eddie Foreign Patent References
International ClassG10K 013/00AbstractA cone formed from paper such as used in speaker as a diaphragm, wherein the wing portions, which may function to reinforce the cone, are selectively arranged and extending from any point in the periphery of the larger diameter circle to any point in the smaller diameter circle of the cone which has a frusto-conical shape and a coating layer is applied to the entire surface of the cone, and a method for making a cone using a sheet of paper, wherein the method comprises steps of cutting a sheet of paper into a desired pattern simultaneously with seaming at least a pair of folding portions composed of a centeral folding line and two lateral folding lines equi-angularly and symmetricaly displaced to each side of the center line, forming wing portions by folding said lines, honding the facing surfaces of the folded portions and, coating the entire surface of the entire surface of the cone with moisture-proof material. | |
