Patents Assigned to Society AP Selmin SAS of Massimo Coltelli & Co.
  • Method and devices for the omnidirectional radiation of sound waves
    Patent number: 4322578
    Abstract: The present invention pertains to a method and apparatus for achieving a uniform omnidirectional radiation of sound waves, particularly at high frequencies, and for increasing selectivity and separation at frequencies in the medium to high frequency wave band The apparatus consists of a series of reflector-diffractor barriers which are frequency selective. Each barrier is operative to transmit sound waves of a frequency greater than a selected value and to reflect and omnidirectionally radiate sound waves of a frequency less than the value.
    Type: Grant
    Filed: September 6, 1978
    Date of Patent: March 30, 1982
    Assignee: Society AP Selmin SAS of Massimo Coltelli & Co.
    Inventor: Paolo Selmin