Patents by Inventor Du Xiong Feng

Du Xiong Feng 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: 6170484
    Abstract: An approach for providing a female contraceptive device is disclosed. The contraceptive device has an upper portion that contacts the cervix and an outer wall. A lower portion of the contraceptive device has corrugated inner walls that form a hollow petal-shaped sections with the outer wall. Each of the petal-shaped sections has a curled edge and is capable of storing semen. The inner wall of the lower portion forms a cavity that receives the penis. The outer wall of the lower portion has surface protrusions that creates a barrier to the flow of semen, yet permits the flow of vaginal secretion. The contraceptive device occupies the upper portion of the vaginal canal, leaving the lower portion of the canal exposed to enhance sensitivity. The bulbous shape of the contraceptive device provides additional sensual stimulation for the female, while the corrugated inner walls enhance simulation for the male.
    Type: Grant
    Filed: March 10, 2000
    Date of Patent: January 9, 2001
    Inventor: Du Xiong Feng