Patents by Inventor Douglas D. Campbell

Douglas D. Campbell 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).

  • Flocked floor mat with foraminous layer
    Patent number: 4587148
    Abstract: Article suitable for floor mats comprising a backing, a foraminous element bonded thereto, said element characterized by having a multiplicity of openings therein, and bristles bonded to the backing, said bristles having a length such that they will protrude through said openings when the mat is trod upon by pedestrians, thereby allowing contact between the bristles and the shoes on feet of the pedestrians. The mat is useful in removing soil and moisture from the shoes and feet of pedestrians.
    Type: Grant
    Filed: April 19, 1985
    Date of Patent: May 6, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Douglas D. Campbell, Mary B. Donovan
  • Flocked three-dimensional network mat
    Patent number: 4293604
    Abstract: A mat formed of a web comprising a resilient three-dimensional network of polymeric material which has been flocked throughout and adhered to a support backing.
    Type: Grant
    Filed: July 11, 1980
    Date of Patent: October 6, 1981
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Douglas D. Campbell
  • Soap-filled pad
    Patent number: 4190550
    Abstract: A seamless, fibrous, soap-filled pad which, when used as a bathing aid, imparts a cleansing and mildly stimulating rubbing action to human skin. A seamless envelope of crimped, resilient, stretchy synthetic organic fibers surrounds a core of solid soap or other suitable surfactant material and is held in integral form solely by the inter-entanglement of the fibers.
    Type: Grant
    Filed: December 14, 1977
    Date of Patent: February 26, 1980
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Douglas D. Campbell