Open-ended For Point Protection During Writing Patents (Class 30/460)
  • Patent number: 4934057
    Abstract: A sharpener, specially for the pencils, is made of a shell and a metal blade. At the upper end of the shell there is a funnel or alternatively two funnels placed side by side. The metal blade is V-notched or U-notched with the opening upward and is placed in the middle of the single funnel or in-between of the two funnels alternatively. The pencil core can be sharpened on the edge (sharped or right-angled) of the notch.
    Type: Grant
    Filed: April 27, 1988
    Date of Patent: June 19, 1990
    Inventor: Wen K. Chao
  • Patent number: 4755074
    Abstract: The disclosure is directed to a pencil sharpener device in which the sharpening element is slidably mounted within a support member for movement between a retracted position when not in use to a protracted position for use in sharpening the pencil. When in use, the sharpening element is movable to its protracted position to permit pencil shavings to fall free out of the support member during the sharpening operation. The disclosure further provides an eraser element or a combined eraser/marker assembly to be removably associated with the device.
    Type: Grant
    Filed: September 17, 1986
    Date of Patent: July 5, 1988
    Inventor: Myrtle M. Roberts