Patents by Inventor John C. Darnall, Jr.

John C. Darnall, Jr. 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 for molding a curved flexible printing plate
    Patent number: 4136150
    Abstract: A flexible printing plate is separated from the inner surface of a curved matrix after formation of the plate in a mold by first moving the ends of the plate inwardly away from the matrix, while maintaining the center of the plate in stationary contact with the matrix, and then moving the center of the plate inwardly away from the matrix, while maintaining the ends of the plate away from the matrix. The matrix is held in an outer mold half, and the printing plate is formed in a mating inner mold half having a center section with sloping side surfaces that converge toward the outer mold half, a first end section having a side surface contiguous to one sloping side surface of the center section, and a second end section having a side surface contiguous to the other sloping side surface of the center section.
    Type: Grant
    Filed: January 27, 1976
    Date of Patent: January 23, 1979
    Assignee: The Times Mirror Company
    Inventor: John C. Darnall, Jr.
  • Apparatus for molding a curved flexible printing plate
    Patent number: 3986698
    Abstract: A flexible printing plate is separated from the inner surface of a curved matrix after formation of the plate in a mold by first moving the ends of the plate inwardly away from the matrix, while maintaining the center of the plate in stationary contact with the matrix, and then moving the center of the plate inwardly away from the matrix, while maintaining the ends of the plate away from the matrix. The matrix is held in an outer mold half, and the printing plate is formed in a mating inner mold half having a center section wih sloping side surfaces that converge toward the outer mold half, a first end section having a side surface contiguous to one sloping side surface of the center section, and a second end section having a side surface contiguous to the other sloping side surface of the center section.
    Type: Grant
    Filed: August 22, 1974
    Date of Patent: October 19, 1976
    Assignee: Times Mirror Company
    Inventor: John C. Darnall, Jr.