Patents Assigned to Sherwood Research and Development Partnership
  • Patent number: 4421526
    Abstract: This invention relates to dry, dense, hydrophilic polyurethane foam cleaning pads containing abrasives, detergents and combinations thereof dispersed integrally therein as well as to a method of manufacturing these pads. The pads' surfaces are strengthened by the densification of the reacting prepolymer resin during manufacture, and preferably the pads have at least one surface textured for additional cleaning area. The surfaces can contain an optional additional layer of abrasives to obtain a greater durability and a more desirable scouring action.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: December 20, 1983
    Assignee: Sherwood Research and Development Partnership
    Inventors: Robert L. Strickman, Melvyn B. Strickman