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:
Mar. 22, 2005
Filed:
Apr. 12, 2002
Avetik Harutyunyan, Columbus, OH (US);
Bhabendra Pradhan, State College, PA (US);
Peter C. Eklund, Boalsburg, PA (US);
Yoshiya Fujiwara, Saitama, JP;
Hajime Goto, Saitama, JP;
Avetik Harutyunyan, Columbus, OH (US);
Bhabendra Pradhan, State College, PA (US);
Peter C. Eklund, Boalsburg, PA (US);
Yoshiya Fujiwara, Saitama, JP;
Hajime Goto, Saitama, JP;
The Penn State Research Foundation, University Park, PA (US);
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
Carbon structures, e.g. carbon nano-fibers, suitable for absorbing hydrogen at low pressures and low temperatures are produced by a selective oxidation and/or acid reflux process. The process includes heating an impure mixture containing a crystalline form of carbon in the presence of an oxidizing gas at a temperature and time sufficient to selectively oxidize and remove a substantial amount of any amorphous carbon impurities from the mixture. Metal containing impurities can be removed from the mixture by exposing the desired carbon and accompanying impurities to an acid to produce a carbon fiber that is substantially free of both non-fiber carbon impurities and metal impurities. Another aspect of the present invention includes purified carbon structures that can store hydrogen at low pressures and temperatures.