Patents by Inventor Marvin C. Echols

Marvin C. Echols 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).

  • 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
  • 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