Patents by Inventor Leif H. Thompson

Leif H. Thompson 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).

  • Selenium diet supplement and method of making
    Patent number: 6319529
    Abstract: A diet supplement improves the growth and health of humans and other animals. The supplement contains: (1) germs having a selenium level of at least about 0.2 ppm that are derived from a cereal grain grown in selenium-rich soil; and (2) plant materials having a selenium level of at least about 0.2 ppm that are from a legume grown in selenium-rich soil.
    Type: Grant
    Filed: August 10, 2000
    Date of Patent: November 20, 2001
    Assignee: Thompson Animal Systems, Inc.
    Inventor: Leif H. Thompson
  • Chromium-carboxylic acid feed supplement
    Patent number: 6139881
    Abstract: The combination of a chromium ion and a carboxylic acid ion selected from the group consisting of a formate ion, a malate ion, and a fumarate ion is an effective feed supplement for ruminant animals and improves their weight gain, feed efficiency, body composition, and milk production.
    Type: Grant
    Filed: January 18, 2000
    Date of Patent: October 31, 2000
    Assignee: Thompson Animal Systems, Inc.
    Inventor: Leif H. Thompson
  • Method of contraception
    Patent number: 5471997
    Abstract: Conception is prevented in male mammals by making an incision in one wall of the vas deferens near the epididymis and inserting a filament into the vas deferens through the incision. The filament has a length at least about one-fourth the length of the vas deferens and an outside diameter about equal to the inside diameter of the vas deferens. It contains an enlargement at one end and is made of a material inert to tissue. The filament is inserted into the vas deferens all the way to the enlargement. The incision remains open around the filament to permit sperm to escape from the vas deferens.
    Type: Grant
    Filed: April 21, 1995
    Date of Patent: December 5, 1995
    Inventor: Leif H. Thompson