Patents by Inventor Stephen David Chapman

Stephen David Chapman 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).

  • Prevention of microbial growth in metal working fluids
    Patent number: 7989405
    Abstract: A method of preventing microbial growth in oil-water metalworking fluid in a machine wherein lubricating oil or hydraulic or tapping fluid can contaminate the metalworking fluid, comprises adding a partitionable anti-microbial agent, active against micro-organisms present in the metalworking fluid, to the lubricating oil or hydraulic or tapping fluid whereby an effective quantity of anti-microbial agent can migrate into the metalworking fluid to reduce micro-organism activity. A machine tool lubricating oil or hydraulic or tapping fluid composition comprises in a mineral oil or other lubricant base and an oil-water partitionable anti-microbial, active against micro-organisms present in oil-water metalworking fluids.
    Type: Grant
    Filed: November 26, 2002
    Date of Patent: August 2, 2011
    Assignee: Illinois Tool Works Inc.
    Inventors: Christopher John Nettleship, Stephen David Chapman