David A Langlois

US Patent:

54751330, Dec 12, 1995

Filed:

Nov 28, 1994

Appl. No.:

8/346108

Inventors:

Elliot P. Douglas - Los Alamos NM
David A. Langlois - Los Alamos NM
Brian C. Benicewicz - Los Alamos NM

Assignee:

The Regents of the University of California - Los Alamos NM

International Classification:

C07C 6976
C08F 3800

US Classification:

560 61

Abstract:

The present invention provides (1) curable bispropargyl-containing monomers represented by the formula: B. sup. 1 --A. sup. 1. sub. m --R--A. sup. 2. sub. n --B. sup. 2 wherein R is a radical selected from the group consisting of 1,4-phenylene, 4,4'-biphenyl, 2,6-naphthalene, --C. sub. 6 H. sub. 4 --CR. sup. 2. dbd. CR. sup. 2 --C. sub. 6 H. sub. 4 -- wherein R. sup. 2 is H or CH. sub. 3, and the same where said groups contain one or more substituents selected from the group consisting of halo, nitro, lower alkyl, lower alkoxy, fluoroalkyl or fluoroalkoxy, A. sup. 1 and A. sup. 2 are selected from the group consisting of --C. sub. 6 H. sub. 4 --C(O)--O-- and --C. sub. 6 H. sub. 4 --O--C(O)--, m and n are 0 or 1, m+n is 0, 1 or 2, and B. sup. 1 and B. sup. 2 are --OCH. sub. 2 --C. tbd. C--H, (2) thermoset compositions comprised of cured segments derived from monomers represented by the formula: B. sup. 1 --A. sup. 1. sub. m --R--A. sup. 2. sub. n --B. sup.

US Patent:

20150303497, Oct 22, 2015

Filed:

Apr 17, 2014

Appl. No.:

14/255847

Inventors:

- Los Alamos NM, US
David A. Langlois - Los Alamos NM, US

Assignee:

LOS ALAMOS NATIONAL SECURITY, LLC - Los Alamos NM

International Classification:

H01M 8/04

Abstract:

A process for rejuvenating fuel cells has been demonstrated to improve the performance of polymer exchange membrane fuel cells with platinum/ionomer electrodes. The process involves dehydrating a fuel cell and exposing at least the cathode of the fuel cell to dry gas (nitrogen, for example) at a temperature higher than the operating temperature of the fuel cell. The process may be used to prolong the operating lifetime of an automotive fuel cell.