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:
Nov. 20, 1990
Filed:
Apr. 12, 1989
Applicant:
Inventors:
Noboru Ichinose, Yokohama, JP;
Hirohumi Tanaka, Anan, JP;
Assignee:
Nichia Kagaku Kogyo K.K., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B / ; H01B / ; H01C / ;
U.S. Cl.
CPC ...
264 61 ; 264 66 ; 264 67 ; 252518 ; 252520 ; 252521 ; 338 20 ; 338 35 ; 423301 ;
Abstract
A method of producing fluorapatite wherein predetermined amounts of calcium monohydrogen phosphate, calcium carbonate, and calcium fluoride are weighed, subjected to a mechanochemical action, and caused to react with one another in water. With this method, a fluorapatite having a uniform composition can be obtained without the accompaniment of by-products. A moisture sensitive resistor of the present invention can be obtained by sintering the fluorapatite produced in accordance with this method. This moisture sensitive resistor has a sufficiently low resistance corresponding to a humidity, and has substantially no hysteresis.