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Title:
ALUMINA FOR SEMICONDUCTOR MEMORY CELL PACKAGE AND PROCESS FOR ITS PRODUCTION
Document Type and Number:
WIPO Patent Application WO/1985/005349
Kind Code:
A1
Abstract:
Alumina for semiconductor memory cell package radiating only low level alpha-rays, and a process for its production which comprises extracting an alumina component from bauxite to obtain a sodium aluminate solution, substantially removing organic compounds contained in the solution, seed-decomposing the solution to deposit alumina hydrate, and baking the alumina hydrate.

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Inventors:
SAKAMOTO AKIRA (JP)
HIRAYANAGI KOUTARO (JP)
Application Number:
PCT/JP1985/000273
Publication Date:
December 05, 1985
Filing Date:
May 20, 1985
Export Citation:
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Assignee:
SHOWA ALUMINIUM IND (JP)
International Classes:
H01L23/06; C01F7/06; C01F7/144; C01F7/46; C01F7/47; C01F7/473; H01B3/12; H01L21/48; H01L23/08; (IPC1-7): C01F7/14; H01B3/12; H01L23/06
Foreign References:
JPS5510461A1980-01-24
JPS53137898A1978-12-01
JPS292625B1
US4038039A1977-07-26
GB745601A1956-02-29
JPS573715A1982-01-09
JPS53137869A1978-12-01
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