Chemistry of inorganic compounds – Phosphorus or compound thereof – Halogen containing
Reexamination Certificate
2006-12-26
2006-12-26
Wood, Elizabeth D. (Department: 1755)
Chemistry of inorganic compounds
Phosphorus or compound thereof
Halogen containing
C423S308000, C423S309000, C501S001000, C106S035000, C424S057000, C424S602000
Reexamination Certificate
active
07153482
ABSTRACT:
The rod-shaped apatite crystals of the formula Ca5(PO4)3(OH)xFyhave the following featuresa) the length-to-breadth ratio of the crystals is at least ≧5 andb) x+y=1, where if x or y≠0 the total amount of the crystals is present as a mixture of individual hydroxyapatite crystals and fluoroapatite crystals and/or as mixed crystals, such that, based on the total amount of the crystals, (1−x)·100% of the hydroxide ions present if y=0 are replaced by fluoride ions.The invention furthermore describes dispersions which contain such rod-shaped apatite crystals, and a process for the preparation of the dispersions or of the apatite crystals.
REFERENCES:
patent: 4448758 (1984-05-01), Nagai et al.
patent: 4794171 (1988-12-01), Tagaya et al.
patent: 5858318 (1999-01-01), Luo
patent: 6013591 (2000-01-01), Ying et al.
patent: 6478825 (2002-11-01), Winterbottom et al.
patent: 100 27 946 (2001-12-01), None
patent: WO 98 18719 (1998-05-01), None
patent: WO 00 37033 (2000-06-01), None
patent: WO 01 01930 (2001-01-01), None
patent: WO 01 34216 (2001-05-01), None
patent: WO 02 02461 (2002-01-01), None
N. Senamaud, et al., “Calcination and sintering of hydroxyfluorapatite powders”, Solid State Ionics, v. 101-103, No. 2002, pp. 1357-1362, Nov. 1, 1997.
Database Inspec Online! The Insstitution Of Electrical Engineers, Stevenage, GB; K. Kamiya, et al., “Effects of the addition of F/sup -/ions on the properties of fibrous hydroxyapetite grown in the gel system”, Database accession No. 3584777 XP002215622 & Materials Research Bulletin, Jan. 1990, USA, v. 25, No. 1, pp. 63-70, ISSN: 0025-5408.
Koch Volker
Noerenberg Ralf
Sterzel Hans-Josef
BASF - Aktiengesellschaft
Wood Elizabeth D.
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