Field emission material

Patent 6664722 Issued on December 16, 2003. Estimated Expiration Date:

June 15, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Electron emission cathode having a semiconductor film; a device including the cathode; and a method for making the cathode
Patent #: 5777427
Issued on: 07/07/1998
Inventor: Tanaka, et al.

Multi-layer carbon-based coatings for field emission
Patent #: 5821680
Issued on: 10/13/1998
Inventor: Sullivan, et al.

Field emitter with wide band gap emission areas and method of using
Patent #: 5861707
Issued on: 01/19/1999
Inventor: Kumar

Electron emission device with electron-emitting fine particles comprised of a metal nucleus, a carbon coating, and a low-work-function utilizing this electron emission device Patent #: 6008569
Issued on: 12/28/1999
Inventor: Yamanobe

Inventors

Application

No. 09/594874 filed on 06/15/2000

US Classes:

313/311, DISCHARGE DEVICES HAVING AN ELECTRODE OF PARTICULAR MATERIAL313/309, DISCHARGE DEVICES HAVING A MULTIPOINTED OR SERRATED EDGE ELECTRODE313/310, DISCHARGE DEVICES HAVING A THERMIONIC OR EMISSIVE CATHODE313/336, Point source cathodes313/351Multipointed or serrated edge electrode

Examiners

Primary: Patel, Vip
Assistant: Santiago, Mariceli

Attorney, Agent or Firm

International Classes

H01J 1/304 (20060101)
H01J 19/06 (20060101)
H01J 1/30 (20060101)
H01J 1/13 (20060101)
H01J 19/00 (20060101)

Abstract

A carbon film having an area of insulating material surrounded by an area of conducing material, and an area of material between the area of insulating material and the area of conducting material having a graded dielectric constant which varies from high to low from the area of insulating material to the area of conducting material. An emission site on the carbon film will emit electrons as a function of time, and as a function of distance across an emission site area.

Other References

WP. Kang et al., The Effects of sp² Content and Surface Treatment on the Field Emission of Micropatterned Pyramidal Diamond tips, Technical Digest of IVMC'97 Kyongju, Korea 1997, pp. 107-111
Ken Okano et al., Low-threshold cold cathodes made of nitrogen-doped chemical-vapour-deposited diamond, Nature International Weekly Journal of Science, vol. 381, No. 6578, May 1996, pp. 140-141
M. W. Geis, Diamond emitters fabrication and theory, 1996 American Vacuum Society (8 pp.)
P. Lerner et al., Theoretical Analysis of a Geis-Spindt Cold Cathode Diamond Emitter, Journal De Physique IV, vol., pp. 39-42, Sep. 1996
W. A. Mackie et al., Work function measurements of diamond film surfaces, (4 pp.), Feb. 20, 1996
W. B. Choi, Field emission from diamond coated molybdeum field emitters, 1996 American Vacuum Society, (6 pp.)
A. F. Myers et al., Characterization of amorphous carbon coated silicon field emitters, 1996 American Vacuum Society, (6 pp.)
C. Bandis et al., Simultaneous field emission and photoemission from diamond, 1996 American Institute of Physics, pp. 366-368