Patents by Inventor Joseph Y. C. Pao

Joseph Y. C. Pao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Diaphragm material for moving coil loudspeaker, may be laminated or integral with surround
    Patent number: 4190746
    Abstract: A diaphragm for a moving evil loudspeaker is formed of a material which has a mechanical "0"value of from 7 to 12, a Youngs modulus of from 8.5 to 17.5 .times. 10.sup.5 KN/M.sup.2 and a density of from 0.85 to 1.05 g/cc. The diaphragm forming material is preferably formed of polypropylene or a propylene-containing copolymer. The diaphragm may be of cone or dome type and included are moving coil loudspeaker constructions wherein other vibrating elements, particularly spiders and outer cone support rings, are formed of the same type of material as the diaphragm.
    Type: Grant
    Filed: March 18, 1977
    Date of Patent: February 26, 1980
    Inventors: Hugh D. Harwood, Joseph Y. C. Pao, David W. Stebbings