Patents by Inventor Leonard Lewin

Leonard Lewin 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 preparing multi-layer proton exchange membranes and membrane electrode assemblies
    Publication number: 20040036394
    Abstract: A process for preparing multi-layer proton exchange membranes (“PEM's”), and membrane electrode assemblies (“MEA's”) that includes the PEM. The process includes (a) providing an article that includes an ionomer membrane adhered to a substrate, the membrane having a surface available for coating; (b) applying a dispersion or solution (e.g., an ionomer dispersion or solution) to the membrane surface; (c) drying the dispersion or solution to form a multi-layer PEM adhered to the substrate; and (d) removing the multi-layer PEM from the substrate. Also featured a multi-layer PEM's and MEA's incorporating such PEM's.
    Type: Application
    Filed: August 21, 2002
    Publication date: February 26, 2004
    Applicant: 3M Innovative Properties Company
    Inventors: Steven Joseph Hamrock, Pinar Erdogdu Serim, John Leonard Lewin, Shawn William Lee
  • Membrane electrode assembly having annealed polymer electrolyte membrane
    Patent number: 6649295
    Abstract: A membrane electrode assembly (MEA) is provided which comprises an annealed polymer electrolyte membrane (PEM). Additionally, the MEA may include annealed catalyst layers annealed in contact with the annealed PEM. Additionally, methods of manufacture are provided. MEA's according to the present invention may be used in an electrochemical cell, such as a hydrogen fuel cell.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: November 18, 2003
    Assignee: 3M Innovative Properties Company
    Inventors: Steven Joseph Hamrock, John Leonard Lewin, Shane Shanhong Mao
  • Membrane electrode assembly having annealed polymer electrolyte membrane
    Publication number: 20010031388
    Abstract: A membrane electrode assembly (MEA) is provided which comprises an annealed polymer electrolyte membrane (PEM). Additionally, the MEA may include annealed catalyst layers annealed in contact with the annealed PEM. Additionally, methods of manufacture are provided. MEA's according to the present invention may be used in an electrochemical cell, such as a hydrogen fuel cell.
    Type: Application
    Filed: April 18, 2001
    Publication date: October 18, 2001
    Applicant: 3M Innovative Properties Company
    Inventors: Steven Joseph Hamrock, John Leonard Lewin, Shane Shanhong Mao
  • Microstrip antenna radiators with series impedance matching means
    Patent number: 4203116
    Abstract: One or more radiating elements are coupled to a source of microwave energy by one or more quarter-wave lines of alternately high and low characteristic impedance.
    Type: Grant
    Filed: August 14, 1978
    Date of Patent: May 13, 1980
    Assignee: International Standard Electric Corporation
    Inventor: Leonard Lewin