Patents by Inventor Lachman Wadhwa

Lachman Wadhwa 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).

  • High performance thermally stable polybenzimidazole film
    Patent number: 5017681
    Abstract: The instant invention involves a process for producing continuous polybenzimidazole films. The process is comprised of the following steps:(a) preparing a solvent solution of a polybenzimidazole polymer;(b) continuously casting the solution upon a support;(c) evaporating a sufficient amount of the solvent to form a self-supporting film in an oven;(d) washing the film in a nonsolvent;(e) removing the film from the support; and(f) continuously collecting the continuous film.
    Type: Grant
    Filed: February 8, 1990
    Date of Patent: May 21, 1991
    Assignee: Hoechst Celanese Corp.
    Inventors: Lachman Wadhwa, Michel Bitritto, Edward J. Powers