Chemistry of inorganic compounds – Phosphorus or compound thereof – Halogen containing
Reexamination Certificate
2008-08-01
2010-06-22
Hendrickson, Stuart (Department: 1793)
Chemistry of inorganic compounds
Phosphorus or compound thereof
Halogen containing
C423S489000
Reexamination Certificate
active
07740820
ABSTRACT:
A method of producing a fluoroapatite is provided. The method comprises preparing a slurry containing a hydroxyapatite which has at least one hydroxyl group, preparing a hydrogen fluoride-containing solution containing a hydrogen fluoride, mixing the hydrogen fluoride-containing solution with the slurry to obtain a mixture to thereby adjust a pH of the mixture in the range of 2.5 to 5, and reacting the hydroxyapatite with the hydrogen fluoride in the mixture in a state that the pH of the mixture is adjusted within the above range to thereby obtain the fluoroapatite by substituting the at least one hydroxyl group of the hydroxyapatite with fluorine atom of the hydrogen fluoride. The method can produce the fluoroapatite having improved acid resistance by reducing an impurity, such as ammonia, derived from a raw material to a low or very low level. Further, a fluoroapatite having high acid resistance is also provided. Furthermore, an adsorption apparatus using such a fluoroapatite is provided.
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patent: 2006/0207940 (2006-09-01), Kobayashi et al.
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U.S. Appl. No. 11/559,422, filed Nov. 14, 2006, and entitled “Method for Producing Adsorbent, Adsorbent, and Adsorption Apparatus.”.
U.S. Appl. No. 12/199,112, filed Aug. 27, 2008, and entitled “Method of Producing Fluoroapatite, Fluoroapatite, and Adsortion Apparatus.”.
U.S. Appl. No. 12/240,152, filed Sep. 29, 2008, and entitled “Fluoraopatite Dried Particles and Adsorption Appartus.”.
English language Abstract of JP 2004-330113, Nov. 25, 2004.
Ishikawa Tsuyoshi
Murakami Yukiko
Ogawara Yoshiyuki
Yoshitake Tomohiko
Greenblum & Bernstein P.L.C.
Hendrickson Stuart
Hoya Corporation
Rump Richard M
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