Patents Assigned to Vencraft Corporation
  • Shadowless sundial
    Patent number: 4338727
    Abstract: A sundial is disclosed comprising specularly reflective convex surfaces that form virtual images of the sun in a separate plane or conical surface in which a numbered dial plate is mounted. The axis of revolution of the curved surfaces is mounted parallel to the axis of rotation of the earth and the time scale is also centered about this axis, but in a separate plane or cone located at a distance below the nearest reflective convex surface equal to the radius of said convex surface.
    Type: Grant
    Filed: September 17, 1980
    Date of Patent: July 13, 1982
    Assignee: Vencraft Corporation
    Inventor: Robert W. Gundlach
  • Signal device
    Patent number: 4171086
    Abstract: A signal device for a mailbox comprising a pivotally mounted, weighted arm which is received by the mailbox door in the closed position. When the door is opened, the arm is released, whereby the weight urges the arm away from the box and into the signalling position.
    Type: Grant
    Filed: February 16, 1978
    Date of Patent: October 16, 1979
    Assignee: Vencraft Corporation
    Inventor: Frederick W. Hudson