Patents by Inventor Joesph L. Lenhart

Joesph L. Lenhart 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).

  • Deformable polymer composites with controlled electrical performance during deformation through tailored strain-dependent conductive filler contact
    Patent number: 9748015
    Abstract: The present invention generally relates to deformable polymer composites, and more particularly to, deformable polymer composites with controlled electrical performance during deformation through tailored strain-dependent conductive filler contact. According to embodiments, a deformable elastomeric conductive material includes: an elastomeric polymer matrix; and conductive filler material uniformly dispersed in the elastomeric polymer matrix sufficient to render the material electrically or thermally conductive. The conductive filler material comprises a plurality of substantially non-entangled particles having an aspect ratio sufficiently large to enable the particles to substantially remain in contact and/or in close proximity with adjacent particles so as to maintain conductive pathways in the material when the material is subjected to deformation up to and exceeding 10% strain.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: August 29, 2017
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Randy A. Mrozek, Joesph L. Lenhart, Geoffrey A. Slipher
  • DEFORMABLE POLYMER COMPOSITES WITH CONTROLLED ELECTRICAL PERFORMANCE DURING DEFORMATION THROUGH TAILORED STRAIN-DEPENDENT CONDUCTIVE FILLER CONTACT
    Publication number: 20150129808
    Abstract: The present invention generally relates to deformable polymer composites, and more particularly to, deformable polymer composites with controlled electrical performance during deformation through tailored strain-dependent conductive filler contact. According to embodiments, a deformable elastomeric conductive material includes: an elastomeric polymer matrix; and conductive filler material uniformly dispersed in the elastomeric polymer matrix sufficient to render the material electrically or thermally conductive. The conductive filler material comprises a plurality of substantially non-entangled particles having an aspect ratio sufficiently large to enable the particles to substantially remain in contact and/or in close proximity with adjacent particles so as to maintain conductive pathways in the material when the material is subjected to deformation up to and exceeding 10% strain.
    Type: Application
    Filed: June 3, 2014
    Publication date: May 14, 2015
    Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-I
    Inventors: Randy A. Mrozek, Joesph L. Lenhart, Geoffrey A. Slipher