×

Composition for bactericidal treatment of water

  • US 4,608,247 A
  • Filed: 10/24/1984
  • Issued: 08/26/1986
  • Est. Priority Date: 10/24/1984
  • Status: Expired due to Term
First Claim
Patent Images

1. A composition for the bactericidal treatment of a stream of water comprising:

  • a. a particulate silver yielding material comprising;

    i. a carrier which has a particle size of between approximately 4 and 20 mesh, a surface area of greater than approximately 150 square inches per gram, and a Mohs scale hardness of greater than 2.5 and which is substantially insoluble in water having a pH of between 5 and 9;

    ii. a layer of elemental silver on the surfaces of said carrier, said silver being between approximately 1% and 10% by weight of said silver yielding material; and

    iii. the mechanical interaction between adjacent particles of said silver yielding material causing a release of elemental silver into said stream when it is passed therethrough;

    b. a particulate filler material intermixed with said silver yielding material, said filler material being substantially insoluble in water having a pH of between 5 and 9, said filler material having a particle size of between approximately 4 and 20 mesh and a Mohs scale hardness of less than 2.5, the volumetric ratio of said filler material to said silver yielding material being between approximately 1;

    1 and 5;

    1; and

    c. said filler material reducing the rate at which elemental silver is released from said composition to produce a controlled release of said elemental silver when said stream is passed therethrough.

View all claims
  • 16 Assignments
Timeline View
Assignment View
    ×
    ×