Patents by Inventor Nelson W. Armstrong

Nelson W. Armstrong 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).

  • Chromatographic septum having polyimide coating
    Patent number: 4066183
    Abstract: Improved septa for chromatographic apparatus and procedures comprise disc or cylindrical bodies of silicone rubber with a coating of polyimide which may in turn be covered by a coating of Teflon.
    Type: Grant
    Filed: February 24, 1977
    Date of Patent: January 3, 1978
    Assignee: L. C. Company, Inc.
    Inventor: Nelson W. Armstrong