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Acoustic vibration plate

  • US 5,473,121 A
  • Filed: 05/15/1992
  • Issued: 12/05/1995
  • Est. Priority Date: 05/16/1991
  • Status: Expired due to Fees
First Claim
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1. An acoustic diaphragm comprising:

  • a paper substrate exhibiting air permeability and having a surface, said substrate having voids therein; and

    a separate layer being formed of microfibrilated pulp and being deposited on the surface of said substrate, said separate layer filling said voids in the paper substrate.

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