Patents Assigned to Instapak Corporation
  • Foam dispensing apparatus
    Patent number: 4023733
    Abstract: Apparatus for making and dispensing two liquids, such as organic resins and polyisocyanates which react to form a polyurethane foam. The apparatus comprises a dispensing gun including a mixing chamber having two liquid entry ports in a non-aligned relationship with each other. One of the entry ports is positioned forward or upstream from the other. A reciprocally mounted valving rod has an extended position for closing the ports and a retracted-position for opening the ports and permitting liquid flow into the mixing chamber.
    Type: Grant
    Filed: September 26, 1975
    Date of Patent: May 17, 1977
    Assignee: Instapak Corporation
    Inventor: Charles R. Sperry
  • System for dispensing polyurethane and the like
    Patent number: 3976230
    Abstract: A polyurethane foam dispensing system wherein electrical lines in the conduits thereof are used to controllably heat the foam precursor materials and to maintain such material at optimum temperature for foam formation. A thermistor at the dispensing end of such conduits senses the temperature of the throughput material and controls the heating element(s) by feedback therefrom.
    Type: Grant
    Filed: October 7, 1974
    Date of Patent: August 24, 1976
    Assignee: Instapak Corporation
    Inventor: Charles R. Sperry
  • Foam dispensing apparatus
    Patent number: 3945569
    Abstract: Apparatus for mixing and dispensing two liquids such as organic resins and polyisocyanates which react to form a polyurethane foam. The apparatus comprises a dispensing gun and related equipment and includes a reciprocally mounted valving rod in the gun, which valving rod is circular at its ends and flattened intermediate such ends. In its retracted position, the valving rod is bathed in a liquid which acts as a cleansing agent therefor.
    Type: Grant
    Filed: October 25, 1974
    Date of Patent: March 23, 1976
    Assignee: Instapak Corporation
    Inventor: Charles R. Sperry