Patents by Inventor Leon H. Zimmerman, Jr.

Leon H. Zimmerman, Jr. 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 making a nonwoven fabric of needling, heating, burnishing and cooling
    Patent number: 4582750
    Abstract: A process is provided for making strong, permeable nonwoven fabrics having an abrasion-resistant burnished surface. The process involves providing a lightly consolidated or weakly bonded web of thermoplastic synthetic organic fibers, needle punching the web, heating a surface of the needled web, and burnishing the heated surface with a rotating, smooth-surfaced metal roll, which preferably simultaneously cools the web surface.
    Type: Grant
    Filed: April 16, 1985
    Date of Patent: April 15, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Gene W. Lou, Leon H. Zimmerman, Jr.