The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 20, 2007
Filed:
May. 29, 2003
Yong-il Park, Kyungbuk, KR;
Friedrich B. Prinz, Woodside, CA (US);
Suk-won Cha, Stanford, CA (US);
Sang-joon John Lee, Sunnyvale, CA (US);
Yuji Saito, Palo Alto, CA (US);
Yong-Il Park, Kyungbuk, KR;
Friedrich B. Prinz, Woodside, CA (US);
Suk-Won Cha, Stanford, CA (US);
Sang-Joon John Lee, Sunnyvale, CA (US);
Yuji Saito, Palo Alto, CA (US);
The Board of Trustees of the Leland Stanford Junior University, Palo Alto, CA (US);
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A fluid impermeable thin film is fabricated on a porous substrate by depositing a material having a certain spatial oxidation expansion. After deposition, the material is oxidized whereby the deposited material expands and forms a void free film on top of the porous substrate. The snuggly contacting grain boundaries of the void free film may recombine to a continuous thin film that has a thickness of only a fraction of 1 μm and is substantially fluid impermeable. The small film height contributes to a high ionic conductivity that makes the thin film a preferred choice for a fuel cell electrolyte membrane enabling efficient fuel cell operation at temperatures well below 500° C.