Patents Examined by Khanh Kang
  • Sound-attenuating panel
    Patent number: 5457291
    Abstract: Acoustic resonator means are embodied through successive stages of molding. A first stage pre-forms resonator enclosures without solid forms inside. After resonator enclosures have been pre-formed they advance to a second stage. A jig form molds pre-formed resonator bulbs and concrete together in a panel molding region to form a resonator panel.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: October 10, 1995
    Inventor: Brian E. Richardson