Patents Assigned to Patrick J. Crehan
  • Patent number: 4521544
    Abstract: A polyurethane foam can be made from waste cellulosic products such as papermill sludge, wood chips, wood particles, sawdust, waste paper or cardboard scraps. The polyurethane foam is made by reacting together a polyisocyanate, a catalyst, and a cellulosic material.
    Type: Grant
    Filed: February 24, 1983
    Date of Patent: June 4, 1985
    Assignees: Patrick J. Crehan, Richard J. Fricke
    Inventor: Richard B. Kennedy
  • Patent number: 4515638
    Abstract: Polyurethane foams are produced utilizing separate mixtures, the first containing a polyisocyanate, a surfactant and optionally a flame retardant, the second containing a carbohydrate, water and a polyurethane producing amine catalyst, the pH of the second mixture being at least 9.
    Type: Grant
    Filed: July 26, 1984
    Date of Patent: May 7, 1985
    Assignees: Richard J. Fricke, Patrick J. Crehan
    Inventor: Richard B. Kennedy
  • Patent number: RE31757
    Abstract: A low reactive pressure flame-retardant polyurethane foam made by reacting together a polymeric isocyanate, a polyol, an aqueous solution of a carbohydrate, calcium acid phosphate, sodium aluminum sulfate, sodium bicarbonate, and a flame retardant. A blowing agent may be present.
    Type: Grant
    Filed: November 23, 1982
    Date of Patent: December 4, 1984
    Assignees: Patrick J. Crehan, Richard J. Fricke
    Inventor: Richard B. Kennedy