Patents by Inventor Michael D. Spence

Michael D. Spence 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: 5330604
    Abstract: A method and apparatus is disclosed for manufacturing papermakers or like fabrics wherein preformed apertured fabric bands are joined together in spaced edge-to-edge disposition in a manner to provide substantial uniformity of construction throughout the fabric width. The invention proposed supporting the bands (11, 12) in spaced parallel disposition on a pinned roller (26) wherein the distribution and configuration of the pins (34) matches the apertures in the bands and creating an infill band in the region between adjacent preformed bands (11, 12) by feeding thermoplastic matrix material to the surface of the pinned roller in said region, causing said matrix material to flow into interstices between the pins and to bond with the material of the preformed bands. Reinforcing yarns (13) will be provided in the region between adjacent preformed bands and extending in a direction parallel to the bands and will be embodied within the matrix material of the joined structure.
    Type: Grant
    Filed: April 1, 1992
    Date of Patent: July 19, 1994
    Assignee: Scapa Group PLC
    Inventors: Andrew Allum, John Jeffery, Ian C. Sayers, Michael D. Spence
  • Patent number: 4758353
    Abstract: Heavy metals are removed from effluent waters using the sequential steps comprising:A. Adding a surfactant;B. pH adjustment;C. Adding a cationic coagulant;D. Adding a flocculant; and,E. Recovering the floc formed by the flocculant.
    Type: Grant
    Filed: June 19, 1987
    Date of Patent: July 19, 1988
    Assignee: Nalco Chemical Company
    Inventors: Michael D. Spence, John M. Kozaruk, Mark Melvin, Stephen M. Gardocki