Patents by Inventor Gary W. Combs

Gary W. Combs 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 the production of thiocarbohydrazide
    Patent number: 4946995
    Abstract: TCH is produced by a process which does not require expensive measures to remove hydrazine. In this process, hydrazinium dithiocarbazinate is reacted with an amine other than hydrazine or a strong base, optionally in the presence of water. It is preferred that a sulfur suppressing compound also be included in the reaction mixture. The precipitated TCH is removed from the reaction mixture to leave a mother liquor. Hydrazinium-dithiocarbazinate may then be added to the mother liquor. TCH precipitates and may be readily recovered.
    Type: Grant
    Filed: March 17, 1989
    Date of Patent: August 7, 1990
    Assignee: Mobay Corporation
    Inventors: Dennis E. Jackman, Gary W. Combs, Westphal Dietmar B.
  • Process for the production of thiocarbohydrazide
    Patent number: 4943660
    Abstract: Thiocarbohydrazide (TCH) is made by reacting carbon disulfide and hydrazine in the presence of a mercaptan at an elevated temperature. The TCH is removed from the reaction mixture, the mother liquor is further treated to form HDTC which is further reacted to form TCH and the mother liquor is recycled. A major advantage of this process is the recyclability of the mother liquor without reduction in TCH yield.
    Type: Grant
    Filed: March 17, 1989
    Date of Patent: July 24, 1990
    Assignee: Mobay Corporation
    Inventors: Dennis E. Jackman, Gary W. Combs, Dietmar B. Westphal
  • Process for the production of thiocarbohydrazide
    Patent number: 4940815
    Abstract: TCH is produced in two stages. In the first stage, carbon disulfide and excess hydrazine are reacted in the presence of a mercaptan and optionally a strong base or an amine other than hydrazine. Carbon disulfide and a strong base (if none was present during the first stage) are then added to the reaction mixture which is further reacted to complete the formation of TCH.
    Type: Grant
    Filed: March 17, 1989
    Date of Patent: July 10, 1990
    Assignee: Mobay Corporation
    Inventors: Dennis E. Jackman, Gary W. Combs, Dietmar B. Westphal