Patents by Inventor Langdon R. Blight

Langdon R. Blight 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).

  • Wash-out apparatus for printing machines
    Patent number: 4218799
    Abstract: A flat plate wash out machine especially suitable for joint brushing and solvent action on photopolymer printing plates in which brushing fingers are held by a pliable sheet with distributed pressure means behind the pliable sheet and the solvent is held in a container so that any photopolymer plates can be held substantially vertical during any wash out procedure. Mechanical agitation is achieved by a simple to and fro action of a pneumatic ram and two containers with perhaps differing solvents can be used at the same time with the same pneumatic ram driving.
    Type: Grant
    Filed: March 6, 1979
    Date of Patent: August 26, 1980
    Assignee: Alison M. Blight
    Inventor: Langdon R. Blight
  • Printing plate washing apparatus
    Patent number: 4023229
    Abstract: Apparatus for the washing out of an unpolymerized portion of a photo polymer printing plate using a selective solvent and brushes, the drive effecting the scrubbing action being either hydraulic or pneumatic and preferably coupling either the brush means or the photo polymer printing plate holding means by means of synchronously driven cranks.
    Type: Grant
    Filed: March 29, 1976
    Date of Patent: May 17, 1977
    Assignee: Alison M. Blight
    Inventor: Langdon R. Blight