Patents by Inventor Donald L. Holland

Donald L. Holland 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).

  • Patent number: 4077288
    Abstract: A multiple paper punch has a base. A substantially vertical stripper plate is mounted on the base and has a plurality of openings for punch pins. A punch pin is mounted in each opening with each punch pin having a cam follower head. A substantially vertical die plate is mounted on the base adjacent the stripper plate and has openings in line with the openings in the stripper plate. The stripper plate and the die plate form a guide for the vertical entry of a sheet to be punched. An operating bar is mounted on a substantially horizontal pivot and has a depending cam portion adapted to engage the head of each punch pin. The punch pins and operating bar are biased to the inactive position by resilient means.
    Type: Grant
    Filed: January 7, 1977
    Date of Patent: March 7, 1978
    Assignee: Hunt Manufacturing Co.
    Inventor: Donald L. Holland
  • Patent number: 3952784
    Abstract: A pencil pointer which comprises a base, a cylindrical cutter mounted on the base, a rotatable pencil holder coaxial with the cutter and having a first guide means on said holder to guide the lead to a position adjacent the cutter, and a second guide means rotatably mounted above said first guide means and having a plurality of selectable openings of different diameters adapted to be rotated into registry with said first guide means. The pointer includes a lead cleaner.
    Type: Grant
    Filed: April 16, 1975
    Date of Patent: April 27, 1976
    Assignee: Hunt Manufacturing Co.
    Inventor: Donald L. Holland