Patents by Inventor Donald A. Shafer

Donald A. Shafer 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).

  • Apparatus for electroplating printing cylinders
    Patent number: 4659446
    Abstract: For electroplating of printing cylinders or the like, cup-like shields of non-conductive acid-resistant material are secured at opposite ends of the cylinder for rotation with the cylinder, the shields extending radially outwardly and having a configuration such as to obtain a field distribution by which the metal deposited on the surface of the cylinder is of substantially uniform thickness and density throughout the length of the cylinder.
    Type: Grant
    Filed: May 15, 1985
    Date of Patent: April 21, 1987
    Assignee: Hallmark Cards, Inc.
    Inventors: Donald A. Shafer, Ronald Walker, Clarence Yeo
  • Protectors for printing cylinder shafts or the like
    Patent number: 4647354
    Abstract: This invention relates to devices for protecting the ends of printing cylinder shafts or the like during electroplating operations, and more particularly, to devices which provide a reliable sealed enclosure operating to protect the shafts and which are readily assembled on the shafts and disassembled therefrom. The devices accommodate shafts of various lengths. They are relatively simple in construction, are readily and economically manufactured, and are easily maintained. Costs of labor and material are reduced to reduce operating costs.
    Type: Grant
    Filed: May 31, 1985
    Date of Patent: March 3, 1987
    Assignee: Hallmark Cards, Inc.
    Inventors: Ronald Walker, Donald A. Shafer, Clarence Yeo