Patents Assigned to ZAP
  • Method of pipe joining
    Patent number: 4120083
    Abstract: Mechanical pipe joints of the pin and bell variety, and methods of forming same, wherein the ends are pre-formed so as to permit a controlled interference fit upon joining and preferably provide a double seal against both internal and external pressure, the joints being particularly adapted for field-grade materials, aluminum members, and internally and externally coated members and being readily disengagable and re-formable without producing galling.
    Type: Grant
    Filed: December 6, 1976
    Date of Patent: October 17, 1978
    Assignee: Zap-Lok Systems International, Inc.
    Inventor: Marvin C. Echols
  • Pipe grooving systems
    Patent number: 4091648
    Abstract: Apparatus for grooving the pin end of a pipe for use in a mechanical pipe joint of the pin and bell variety, and methods of forming a groove in a pin end, wherein the apparatus includes rollers for contacting the internal and external surfaces of a pipe and the rollers are rotatable as a pair of rollers about the axis of the pipe and are cooperable to groove and form the end of a pipe to the configuration of the rollers.
    Type: Grant
    Filed: April 6, 1977
    Date of Patent: May 30, 1978
    Assignee: Zap-Lok Systems International
    Inventor: Joe C. McCaslin
  • Method of joining plastic coated pipe
    Patent number: 4064619
    Abstract: Mechanical pipe joints of the pin and bell variety, and methods of forming same, wherein the ends are pre-formed so as to permit a controlled interference fit upon joining and preferably provide a double seal against both internal and external pressure, the joints being particularly adapted for field-grade materials, aluminum members, and internally and externally coated members and being readily disengagable and re-formable without producing galling.
    Type: Grant
    Filed: December 3, 1976
    Date of Patent: December 27, 1977
    Assignee: Zap-Lok Systems International, Inc.
    Inventors: Marvin C. Echols, David L. Gruller