Patents by Inventor John E. Parks

John E. Parks 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).

  • In vitro production of haploid germ cells
    Patent number: 6872569
    Abstract: The present invention relates to a method of in vitro spermatogenesis involving Sertoli cells and diploid germ cells from a testis of a male mammal to yield differentiated haploid spermatids. The present invention also relates to spermatids produced by the method described above, where the spermatids are haploid. The present invention also involves a method of overcoming male infertility in mammals involving the use of the haploid round spermatids produced by the in vitro spermatogenesis method of the present invention. The present invention also relates to isolated haploid spermatids.
    Type: Grant
    Filed: May 16, 2002
    Date of Patent: March 29, 2005
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Dong Ryul Lee, Michael T. Kaproth, John E. Parks
  • In vitro production of haploid germ cells
    Publication number: 20030027329
    Abstract: The present invention relates to a method of in vitro spermatogenesis involving Sertoli cells and diploid germ cells from a testis of a male mammal to yield differentiated haploid spermatids. The present invention also relates to spermatids produced by the method described above, where the spermatids are haploid. The present invention also involves a method of overcoming male infertility in mammals involving the use of the haploid round spermatids produced by the in vitro spermatogenesis method of the present invention. The present invention also relates to isolated haploid spermatids.
    Type: Application
    Filed: May 16, 2002
    Publication date: February 6, 2003
    Inventors: Dong Ryul Lee, Michael T. Kaproth, John E. Parks
  • Snap-in nut for frame attachment to body
    Patent number: 4828440
    Abstract: A nut is comprised of a one piece stamping having a base wall with an integrally formed conical nut. A frame member has a bolt receiving first aperture in a first planar wall and a nut receiving second aperture in a second planar wall extending at a generally perpendicular angle with respect to the first planar wall. The stamping has integral stop tabs which engage with the frame member to limit the insertion of the stamping into the second aperture so that the conical nut is registered with the bolt receiving first aperture. First and second integral flexure arms flex inwardly upon insertion of the stamping through the second aperture and then engage with the inner surface of the frame member to retain the stamping against removal from the frame member.
    Type: Grant
    Filed: July 22, 1988
    Date of Patent: May 9, 1989
    Assignee: General Motors Corporation
    Inventors: Robert L. Anderson, John E. Parks