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Minoru Kondo and Yoshinori Hatou received US Patent No. 3,951,735 on April 20, 1976, filed May 28, 1974. It was assigned to Asano Slate Co Ltd.
The patent's abstract:
A gypsum wallboard or plasterboard having a high mechanical strength, especially high impact strength, and a large bulk density is prepared from a mixture consisting essentially of calcined gypsum, cellulosic fibers, asbestos fibers, a setting retardant for the calcined gypsum and water, by withdrawing solid components of the mixture in layer form. A plurality of the thus-obtained layers is piled to form a preform of the desired thickness and pressure-molding the preform under a molding pressure of from 10 to 400 kg/cm 2 to obtain the board product.
- Author
- Minoru Kondo; Yoshinori Hatou
- Published by
- US Patent and Trademark Office
- Series
- US Patent No. 3,951,735
- Date
- April 20, 1976
- Library no.
- ACL Doc 23440 · asbestosclaims.law/library/23440
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 7 pages · 645 KB
Where it was listed
- Asbestos, August 1976, in its patents department (the year's issues)
Cite this document
Minoru Kondo, Yoshinori Hatou. “Process for preparing gypsum board (US Patent 3,951,735, 1976).” April 20, 1976. US Patent No. 3,951,735. US Patent and Trademark Office. AsbestosClaims.Law Library, ACL Doc 23440. https://asbestosclaims.law/library/23440.
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