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:
Mar. 16, 2021
Filed:
Oct. 22, 2019
Applicant:
Tokuyama Corporation, Shunan, JP;
Inventors:
Assignee:
TOKUYAMA CORPORATION, Yamaguchi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B 11/26 (2006.01); C04B 11/032 (2006.01);
U.S. Cl.
CPC ...
C04B 11/262 (2013.01); C04B 11/032 (2013.01);
Abstract
Gypsum derived from waste gypsum boards is calcined and converted into gypsum granules including hemihydrate and/or anhydrous type III gypsum. The calcined gypsum granules are dropped into water to prepare a gypsum slurry. Then, dihydrate gypsum particles are crystalized in the slurry. The temperature of the gypsum granules just before being dropped into the water is 90° C. or higher.