Patents Represented by Attorney David G. Parkhurst

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  • Rigid-diaphragm transducer with plural coils
    Patent number: 4354066
    Abstract: A rigid surface transducer of the electroacoustic type more commonly referred to as an audio speaker. The transducer comprises an improved diaphragm and driver configuration and improved excitation modes. The improved features employ a rigid diaphragm which is driven in a coherent linear type motion.
    Type: Grant
    Filed: September 15, 1980
    Date of Patent: October 12, 1982
    Inventor: Robert W. Necoechea
  • Method of bonding urethane formulations to rubber
    Patent number: 4240852
    Abstract: A method wherein uncured urethane formulations are bonded to a cured rubber or synthetic rubber substrate in such a manner so as to provide greater bonding strength than has been achieved previously in urethane formulation bonding to rubber or synthetic rubber.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: December 23, 1980
    Assignee: Synair Corporation
    Inventors: Edward N. Gomberg, Dana W. Somesla