Patents by Inventor Alan M. Harrison

Alan M. Harrison has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4584209
    Abstract: A method of manufacturing a floor covering which includes the steps of:(a) mixing grits of at least one abrasive substance, and of a dimension not exceeding 0.7 mm, with a thermoplastic paste;(b) applying at least one coating of the mixture to a sheet of base material ahead of a doctor knife;(c) passing the coated sheet under the doctor knife, whereby the coating is levelled;(d) then sprinkling a mixture of silicon carbide grits and colored quartz aggregate particles, each of a dimension exceeding 0.7 mm, onto the surface of said coating and(e) curing the coated sheet;(f) the grits applied ahead of the doctor knife being of a dimension which does not exceed half the thickness of the coating as levelled by the doctor knife. Preferably, the coloring of the floor covering is mainly derived from the color of the sprinkled particles of quartz aggregate, and preferably the particles of colored quartz have a dimension not exceeding 1.8 mm. The invention also provides a floor covering when so produced.
    Type: Grant
    Filed: January 4, 1985
    Date of Patent: April 22, 1986
    Assignee: Welwyn Plastics (1955) Limited
    Inventor: Alan M. Harrison