Patents by Inventor Christopher D. Messelt

Christopher D. Messelt 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 preparing hydroxyalkylcellulose ethers
    Patent number: 4661589
    Abstract: Alkylene oxide is added as a vapor in preparing C.sub.2 or higher hydroxyalkylcellulose ethers and hydroxyalkylalkylcellulose ethers by continuously adding the reagents to alkali cellulose at elevated temperatures.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: April 28, 1987
    Assignee: The Dow Chemical Company
    Inventors: Glen L. Adams, Christopher D. Messelt
  • Process for preparing hydroxyalkylcellulose ethers
    Patent number: 4477657
    Abstract: Higher reaction efficiencies are seen in cellulose etherification reactions when the reagents are continuously added to alkali cellulose at elevated temperatures. In particular, mixed hydroxyalkylcellulose ethers are prepared with higher reaction efficiencies using this process. In an especially preferred embodiment, hydroxypropylmethylcellulose is prepared by continuously adding propylene oxide to heated cellulose containing a small amount of caustic, adding more caustic and then continuously adding methyl chloride at elevated temperatures.
    Type: Grant
    Filed: July 8, 1983
    Date of Patent: October 16, 1984
    Assignee: The Dow Chemical Company
    Inventors: Carl P. Strange, Christopher D. Messelt, Clark W. Gibson
  • Multiple stage process for preparing mixed hydroxyalkylcellulose ethers
    Patent number: 4456751
    Abstract: Mixed hydroxyalkyl cellulose ethers are prepared in a multi-stage etherification process, for example, hydroxyethylmethylcellulose is prepared by reacting alkali cellulose sequentially with ethylene oxide, methyl chloride, ethylene oxide and methyl chloride to form a product having uniform substitution. Products made by this process have improved solubility and other properties.
    Type: Grant
    Filed: September 22, 1983
    Date of Patent: June 26, 1984
    Assignee: The Dow Chemical Company
    Inventors: Christopher D. Messelt, Glenda P. Townsend