Speaker structure
Patent 4142604 Issued on March 6, 1979. Estimated Expiration Date: 
September 15, 1996. 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.
September 15, 1996. 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 1875171 2036832 2206012 2544742 2792069 2890297 2915588 3578103 Loudspeaker arrangement Speaker enclosure Patent #: 4033430 InventorApplicationNo. 05/723577 filed on 09/15/1976US Classes:181/156, Reflex baffle181/154, Inclined diaphragm181/199Speaker typeExaminersPrimary: Tomsky, Stephen J.Attorney, Agent or FirmInternational ClassesH04R 1/28 (20060101)H04R 1/02 (20060101) AbstractA speaker structure comprising a tetrahedronal shell having an upper end and an equilateral triangular base with equisized triangular walls and with the margins of the adjacent walls and base being secured together and wherein one of the walls includes a pattern of port openings and these openings are arranged about a central opening spanned by a speaker which is fixed thereabout.Other References
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