Method for synthesizing diamond by using plasma

Patent 4767608 Issued on August 30, 1988. Estimated Expiration Date:

October 19, 2007. 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

3705937

Growth of synthetic diamonds having altered electrical conductivity
Patent #: 4277293
Issued on: 07/07/1981
Inventor: Nelson , et al.

Method for synthesizing diamond
Patent #: 4434188
Issued on: 02/28/1984
Inventor: Kamo , et al.

Diamondlike flakes
Patent #: 4495044
Issued on: 01/22/1985
Inventor: Banks

Diamond-like film and process for producing same
Patent #: 4504519
Issued on: 03/12/1985
Inventor: Zelez

Glow discharge method of applying a carbon coating onto a substrate Patent #: 4663183
Issued on: 05/05/1987
Inventor: Ovshinsky , et al.

Inventors

Assignee

National Institute for Researches in Inorganic Materials

Application

No. 07/109509 filed on 10/19/1987

US Classes:

423/446, Diamond117/102, With significant flow manipulation or condition, other than merely specifying the components or their sequence or both117/103, Using an energy beam or field, a particle beam or field, or a plasma (e.g., ionization, PECVD, CBE, MOMBE, RF induction, laser)117/929, Carbon (e.g., diamond) {C30B 29/04}204/173, Carbon427/113, Carbon base427/577Inorganic carbon containing coating material, not as steel (e.g., carbide, etc.)

Examiners

Primary: Doll, John
Assistant: Kunemund, Robert

Attorney, Agent or Firm

Oblon, Fisher, Spivak, McClelland & Maier

International Classes

C23C 16/50 (20060101)
C23C 16/27 (20060101)
C30B 25/10 (20060101)
C01B 31/00 (20060101)
C01B 31/06 (20060101)
C23C 16/513 (20060101)
C23C 16/26 (20060101)

Foreign Application Priority Data

1986-10-23 JP

Abstract

A method for synthesizing diamond, which comprises:(a) generating a plasma by electric discharge in a gas selected from the group consisting of a hydrocarbon gas, hydrogen gas, an inert gas and a mixture thereof,(b) decomposing a carbon source by the plasma to form plasma gas containing carbon ions or carbon radicals,(c) effecting adiabatic expansion of the plasma gas to precipitate diamond.