Patents by Inventor Dao-Pin Chang

Dao-Pin Chang 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: 5545560
    Abstract: The apparatus transforms animal waste produced during husbandry activities into useful materials such as organic-based manure and/or fertilizer to thereby mitigate the pollution problems associated with husbandry activities. A base part of the apparatus includes an endless conveyor having a filter in the form of an endless loop. A liquid-collection receptacle is interposed between the upper and lower runs of the filter so as to collect liquid filtrate from the waste material. A first hopper is located beneath one end of the endless loop so as to collect the solid content of the waste conveyed along the upper run of the filter. A second hopper is provided to accommodate material to be added to the solid content of the waste. The materials are fed from the respective hoppers into a mixing chamber whereupon they are mixed by a mixer. The base part of the apparatus is connected to a closed system of treatment tanks.
    Type: Grant
    Filed: December 4, 1995
    Date of Patent: August 13, 1996
    Inventor: Dao-Pin Chang
  • Patent number: 4989592
    Abstract: A type of device to improve male sexual potency; a penis protecting pad made of flexible material; on the upper edge of the penis protecting pad are two adjusting pads, and on its lower edges are left and right adjusting belts respectively pulled through the slots on the waist band. On the lower part of the penis protecting pad is a threaded tube joint to accommodate an inside threaded tube body. One end of the tube body is jointed and adhered to a flexible glans penis to form a penis-shaped structure to be worn onto a real penis.
    Type: Grant
    Filed: August 1, 1989
    Date of Patent: February 5, 1991
    Inventor: Dao-pin Chang
  • Patent number: 4854303
    Abstract: Hair circle for conjugal affection is described. The circle consists of a base member of elastic material having a plurality of mutually spaced round holes extending radially therethrough. A tuft of soft hair extends through each hole with a single tuft extending through a pair of holes. The hair tufts are secured by a adherent film coated on the inner surface of the base member. The tufts may be arranged in rows longitudinally, transverse, or in triangular shapes and the base member can have a cross-section which is rectangular, semicircular, elliptical, or substantially circular.
    Type: Grant
    Filed: October 21, 1987
    Date of Patent: August 8, 1989
    Inventor: Dao-Pin Chang