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:
Apr. 16, 2013
Filed:
Oct. 26, 2010
Applicants:
Masanori Haba, Osaka, JP;
Nan Jiang, Osaka, JP;
Hong-xing Wang, Osaka, JP;
Akio Hiraki, Osaka, JP;
Inventors:
Assignee:
Pureron Japan Co., Ltd, Fukushima, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 1/30 (2006.01);
U.S. Cl.
CPC ...
Abstract
A carbon film of the present invention has an elongated needle shape whose radius decreases toward a tip. The shape is, preferably, a shape in which a field concentration coefficient β in the Fowler-Nordheim equation is expressed by h/r where r denotes the radius in an arbitrary position and h denotes height from the arbitrary position to the tip.