Patents by Inventor David S. K. Cheng

David S. K. Cheng 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: 4843005
    Abstract: The invention is directed to a process for regenerating plants from corn tissue. The process comprises the steps of in vitro conditioning of the corn tissue, culturing the corn tissue on a callus induction medium to induce callus, and regenerating plants from the callus. The callus may optionally be maintained prior to regeneration and the plants may optionally be cultured on an establishment medium prior to transfer to the soil.
    Type: Grant
    Filed: August 18, 1986
    Date of Patent: June 27, 1989
    Assignee: Sungene Technologies Corporation
    Inventors: David S. K. Cheng, Andrew S. Wang
  • Patent number: 4666844
    Abstract: The present invention relates to the regeneration of cereals including barley, corn, wheat, rice and sorghum. The process comprises the steps of:(a) culturing tissue obtained from a cereal plant on an induction medium comprising mineral salts, vitamins, sucrose and a hormone in an amount sufficient to ensure callus formation,(b) culturing the callus on a series of media, said series comprising at least one medium and each medium comprises mineral salts, vitamins, sucrose and a hormone in an amount sufficient to insure differentiating to plantlets having shoots and roots at the completion of the series, and(c) culturing the plantlets on an establishment medium comprising mineral salts, vitamins and sucrose, whereby the plantlets are established so that they can be transplanted to soil.
    Type: Grant
    Filed: September 7, 1984
    Date of Patent: May 19, 1987
    Assignee: Sungene Technologies Corporation
    Inventor: David S. K. Cheng