Carbonaceous fiber acute-angled at both ends and production process therefor
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United States of America Patent
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Apr 24, 2001
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N/A
app pub date -
Nov 22, 1999
filing date -
Nov 20, 1998
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Abstract
Carbonaceous fibers having sharp ends and which are useful as an electron-emitting material, for example, in cold-cathode display devices. Carbonaceous fibers having a structure such that planes formed of carbon atoms in a condensed ring structure are concentrically grown around a fiber axis then subjected to heating at a temperature of 400-1200.degree. C. in the presence of oxygen.
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