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:
Jul. 09, 1991
Filed:
Sep. 18, 1986
Syoichi Washizuka, Yokohama, JP;
Kazutaka Terashima, Ebina, JP;
Johji Nishio, Yokohama, JP;
Masayuki Watanabe, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A method of manufacturing compound semiconductor crystals, comprising the steps of, providing a compound semiconductor melt in a crucible, said melt having a composition ratio which deviates from stoichiometry, pulling a compound semiconductor crystal from said crucible by using a seed crystal, and during the pulling step, adding to the melt a constitutional element of said compound semiconductor melt which is present in less than a stoichiometric amount, the element being added in a quantity sufficient to maintain said composition ratio of the first step. An apparatus for manufacturing compound semiconductor crystals is also provided.