Patents by Inventor Stephen J. Merryweather

Stephen J. Merryweather 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 alkyl hydroxyalkyl cellulose ethers
    Patent number: 7005515
    Abstract: The process for preparing an alkyl hydroxyalkyl cellulose ether comprises the steps of: a) alkalizing cellulose to obtain alkali cellulose, b) reacting alkali cellulose with an alkyl halogenide until an alkyl cellulose ether with a D.S.(alkyl) value of from 0.7 to 2.5. is attained, c) removing excess alkyl halogenide from the reaction mixture, and d) reacting the alkyl cellulose ether with an alkylene oxide in a liquid suspending agent to produce an alkyl hydroxyalkyl cellulose ether. An alkyl hydroxyalkyl cellulose ether is produced which has an D.S.(alkyl) of from 0.7 to 2.5 and an MS (hydroxyalkyl) from 0.03 to 2.0, wherein not more that 15 percent of the hydroxyalkyl groups are capped with an alkyl group.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: February 28, 2006
    Assignee: Dow Global Technologies Inc.
    Inventors: Hans P. Schneider, Wolfgang H. Beer, Stephen J. Merryweather
  • Process for preparing alkyl hydroxyalkyl cellulose ethers
    Publication number: 20040102625
    Abstract: The process for preparing an alkyl hydroxyalkyl cellulose ether comprises the steps of: a) alkalizing cellulose to obtain alkali cellulose, b) reacting alkali cellulose with an alkyl halogenide until an alkyl cellulose ether with a D.S. (alkyl) value of from o.7 to 2.5. is attained, c) removing excess alkyl halogenide from the reaction mixture, and d) reacting the alkyl cellulose ether with an alkylene oxide in a liquid suspending agent to produce an alkyl hydroxyalkyl cellulose ether. An alkyl hydroxyalkyl cellulose ether is produced which has an D.S. (alkyl) of from 0.7 to 2.5 and an MS (hydroxyalkyl) from 0.o3 to 2.0, wherein not more that 15 percent of the hydroxyalkyl groups are capped with an alkyl group.
    Type: Application
    Filed: August 22, 2003
    Publication date: May 27, 2004
    Inventors: Hans P. Schneider, Wolfgang H. Beer, Stephen J. Merryweather