Patents by Inventor Wallace Shrimpton

Wallace Shrimpton 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).

  • Process for cell separation
    Patent number: 4605558
    Abstract: A process for the separation of X sperm and Y sperm by phenotypic differences in a gravity separation process wherein an osmolality gradient is provided within the separation vessel, the osmolality preferably being in inverse relationship to the density gradient.
    Type: Grant
    Filed: April 20, 1984
    Date of Patent: August 12, 1986
    Inventor: Wallace Shrimpton
  • Method and means for controlling the sex of mammalian offspring and product therefor
    Patent number: 4474875
    Abstract: A method of controlling the sex of mammalian offspring by separating spermatozoa into fractions having the desired sex characteristics and artificially inseminating the female to produce offspring of the desired sex. The sperm is separated by applying a buoyant force or forces to a mixture of sperm in nutrient media so that separation occurs according to density of the sperm. The nutrient media is controlled as to density characteristics and can have a uniform density gradient from top to bottom so that buoyant forces within such media are selectively applied to sperm of different density to effect separation of the sperm and to hold sperm fractions of different density in suspended relation within the nutrient media. Substantially pure sperm fractions (having the desired male or female sex characteristics) are isolated at the top or at the bottom of a separation column for use in artificially inseminating the female.
    Type: Grant
    Filed: August 18, 1980
    Date of Patent: October 2, 1984
    Inventor: Wallace Shrimpton
  • Method and means for controlling the sex of mammalian offspring and product therefor
    Patent number: 4327177
    Abstract: A method of controlling the sex of mammalian offspring by separating spermatozoa into fractions having the desired sex characteristics and artificially inseminating the female to produce offspring of the desired sex. The sperm is separated by applying a buoyant force or forces to a mixture of sperm in nutrient media so that separation occurs according to density of the sperm. The nutrient media is controlled as to density characteristics and can have a uniform density gradient from top to bottom so that buoyant forces within such media are selectively applied to sperm of different density to effect separation of the sperm and to hold sperm fractions of different density in suspended relation within the nutrient media. Substantially pure sperm fractions (having the desired male or female sex characteristics) are isolated at the top or at the bottom of a separation column for use in artificially inseminating the female.
    Type: Grant
    Filed: August 18, 1980
    Date of Patent: April 27, 1982
    Inventor: Wallace Shrimpton