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:
Aug. 20, 1991
Filed:
Dec. 13, 1989
Applicant:
Inventor:
Makoto Kuramoto, Amagasaki, JP;
Assignee:
Osaka Titanium Co., Ltd., Hyogo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B05D / ;
U.S. Cl.
CPC ...
427213 ; 427215 ; 427255 ; 4272551 ; 427314 ;
Abstract
An apparatus for heating polycrystalline silicon, in which polycrystalline silicon of semiconductor grade placed in the reaction vessel is directly heated by means of a heater outside of the reaction vessel where the inner surface of the reaction vessel is formed of graphite coated with highly pure silicon and having a thickness of 100 microns or more.