Patents by Inventor Nelson W. Smith

Nelson W. Smith 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).

  • Metal working lubricant
    Patent number: 4824586
    Abstract: An improved acidic metal working lubricant composition that is adapted to deposit oil upon the metal surfaces being treated at an acidic pH, which composition includes an alkaline activated surface active agent to promote cleansing of the deposited oil from the metal surfaces during alkaline cleaning of the metal surfaces after metal working without affecting lubricant performance during metal working.
    Type: Grant
    Filed: September 1, 1987
    Date of Patent: April 25, 1989
    Assignee: Pennwalt Corporation
    Inventors: Mark D. Johnson, Nelson W. Smith