Patents by Inventor Roger Le Fol

Roger Le Fol 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).

  • Method of preparing paper for filter bags, apparatus for implementing the method, and product obtained thereby
    Patent number: 5527429
    Abstract: A method of preparing paper for filter bags, the method of the type comprising a step during which a non-woven paper is prepared comprising two superposed layers, namely a layer based on synthetic fibers and a layer of cellulose fibers, by a technique which is known per se, wherein the method includes a subsequent step of subjecting the non-woven paper to a calendering operation between a support structure and a heated cylinder having projections. The present invention also provides apparatus for implementing the method and products obtained in this manner.
    Type: Grant
    Filed: May 12, 1993
    Date of Patent: June 18, 1996
    Assignee: Papeteries de Cascadec
    Inventors: Abel Dambreville, Roger Le Fol, Philippe Deleplanque, Yves Le Brech