David L Olmeijer

US Patent:

7052805, May 30, 2006

Filed:

Jun 1, 2001

Appl. No.:

09/872770

Inventors:

Subhash Narang - Palo Alto CA, US
Susanna C. Ventura - Los Altos CA, US
David L. Olmeijer - San Francisco CA, US

Assignee:

SRI International - Menlo Park CA

International Classification:

H01M 2/16
H01M 10/08

US Classification:

429314, 252 622, 429303

Abstract:

The invention includes compositions comprising at least first and second polymers and optionally a third polymer wherein acid subunits, basic subunits and elastomeric subunits are contained in the polymers. In one aspect, the composition comprises a ternary polymer blend comprising an acidic polymer comprising acidic subunits, a basic polymer comprising basic subunits and an elastomeric polymer comprising elastomeric subunits. In an alternate aspect, the composition comprises a binary polymer blend which comprises acidic or basic subunits in one polymer and a copolymer comprising the other of the acidic or basic subunit and an elastomeric subunit. Such polymer compositions may be formed into a membrane having electrochemical properties which permit the use of such a membrane in an electrochemical device.

US Patent:

7202001, Apr 10, 2007

Filed:

May 13, 2003

Appl. No.:

10/438186

Inventors:

Shuguang Cao - San Jose CA, US
Helen Xu - Sunnyvale CA, US
Thomas Jeanes - Foster City CA, US
Kie Hyun Nam - Palto Alto CA, US
Jian Ping Chen - Palo Alto CA, US
David Olmeijer - San Francisco CA, US

Assignee:

Polyfuel, Inc. - Mountain View CA

International Classification:

C08F 116/36
C08F 16/36
C08F 216/36
H01M 6/00

US Classification:

429314, 429 33, 429317, 526287, 526316, 5263075, 5263481

Abstract:

This invention relates to sulfonated copolymers which are useful in forming polymer electrolyte membranes used in fuel cells.

US Patent:

7354679, Apr 8, 2008

Filed:

Nov 12, 2004

Appl. No.:

10/987178

Inventors:

Shuguang Cao - Mountain View CA, US
Jian Ping Chen - Palo Alto CA, US
Thomas Jeanes - Antioch CA, US
Kie Hyun Nam - Palo Alto CA, US
David Olmeijer - San Francisco CA, US
Helen Xu - Sunnyvale CA, US

Assignee:

Polyfuel, Inc. - Mountain View CA

International Classification:

H01M 8/10
H01M 6/18

US Classification:

429314, 429 33, 429317, 525534, 525535, 525537

Abstract:

This invention relates to ion conducting random copolymers that are useful in forming polymer electrolyte membranes used in fuel cells.

US Patent:

7534515, May 19, 2009

Filed:

Jan 23, 2003

Appl. No.:

10/351257

Inventors:

Kiehyun Nam - Palo Alto CA, US
Helen Xu - Sunnyvale CA, US
Shuguang Cao - Mountain View CA, US
David Olmeijer - San Francisco CA, US
Jon Servaites - San Francisco CA, US
Ying Wang - Milpitas CA, US

Assignee:

Polyfuel, Inc. - Mountain View CA

International Classification:

H01M 8/10

US Classification:

429 33, 429309, 524500, 526243

Abstract:

An acid-base proton conducting polymer blend membrane is provided. The acid-base proton conducting polymer blend membrane comprises a first acidic polymer having acidic subunits, a second basic polymer having basic subunits, and a third polymer containing one or more functional units for improving membrane conductivity, flexibility, water remaining ability, dimension stability, and methanol crossover. In one embodiment, the acid-base polymer blend membrane of the present invention comprises a first acidic polymer having acidic subunits, a second basic polymer having basic subunits, wherein at least one of the first acidic and second basic polymer comprises one or more functional units to improve the properties of the membrane. The functional units include hydrophilic units, methanol blocking units, methanol blocking units, dimensional stabilizer units, and flexible units.

US Patent:

8277899, Oct 2, 2012

Filed:

Nov 10, 2011

Appl. No.:

13/294115

Inventors:

Kevin Krogman - Santa Clara CA, US
David Olmeijer - San Francisco CA, US
Rajul Shah - Fremont CA, US
Benjamin Wang - Mountain View CA, US

Assignee:

Svaya Nanotechnologies, Inc. - Sunnyvale CA

International Classification:

B05D 3/02

US Classification:

4273855, 427348, 427379, 427384, 4273897, 4273935, 4274211, 4274274

Abstract:

The invention provides methods for modifying one or more properties of porous thin films. In such methods, a formulation comprising a reactive species is applied to the porous thin film and allowed to crosslink. In some embodiments, the crosslinked network thus formed imparts increased mechanical strength and wear resistance to the porous thin films.

US Patent:

20030148159, Aug 7, 2003

Filed:

Dec 19, 2002

Appl. No.:

10/325366

Inventors:

Philip Cox - San Jose CA, US
Douglas Diez - Union City CA, US
Jonathan Servaites - San Francisco CA, US
David Olmeijer - San Francisco CA, US

International Classification:

H01M004/86
H01M004/88
H01M008/10

US Classification:

429/030000, 502/101000, 429/040000

Abstract:

A method of applying catalytic materials on the membrane of fuel cells using gravure process is provided. In accordance with the method, a catalyst ink comprising catalyst agglomerates with controlled particle size and porosity is formed. The catalyst ink is then applied onto a membrane surface using gravure process to form a catalyst layer having a plurality of three dimensional structural units substantially vertical to the membrane surface.

US Patent:

20060068268, Mar 30, 2006

Filed:

Sep 8, 2005

Appl. No.:

11/222643

Inventors:

David Olmeijer - San Francisco CA, US

International Classification:

H01M 4/86
H01M 4/96
H01M 4/88
B05D 5/12
H01M 2/08

US Classification:

429042000, 429044000, 427115000, 502101000, 429036000

Abstract:

This application relates to membrane electrode assemblies (MEA's) that contain an ion conducting adhesion promotion layer to promote structural stability at the interface of the PEM and catalyst layer within the MEA.

US Patent:

20060110631, May 25, 2006

Filed:

Feb 18, 2005

Appl. No.:

11/061331

Inventors:

David Olmeijer - San Francisco CA, US
Christopher Castledine - Mountain View CA, US
Jonathan Servaites - Oakland CA, US
Douglas Diez - Union City CA, US

International Classification:

H01M 8/00

US Classification:

429012000

Abstract:

The invention relates to catalyst inks used in the formation of catalyst coated membranes used in fuel cells.