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:
Apr. 20, 2010
Filed:
Oct. 03, 2008
Jen-chang Yang, Taipei, TW;
Hong-da Wu, Taipei, TW;
Nai-chia Teng, Taipei, TW;
Sheng-yang Lee, Taipei, TW;
Jen-Chang Yang, Taipei, TW;
Hong-Da Wu, Taipei, TW;
Nai-Chia Teng, Taipei, TW;
Sheng-Yang Lee, Taipei, TW;
Taipei Medical University, Taipei, TW;
Abstract
The invention provides a process for preparing α-calcium sulfate hemihydrate which comprises the following steps: adding aqueous solutions containing sulfate ions and calcium ions to calcium chloride solution with a range of concentration; reacting the mixture of a) at a range of temperature for an appropriate time; filtering and washing the reaction products of b) with a rising solvent to isolate the solid and liquid phases; and d) collecting and drying the solid phase to obtain α-calcium sulfate hemihydrate with high purity; wherein the relationship between the range of the concentration of calcium chloride (y) and the range of the reaction temperature (x) is shown as the following formula: −0.4x+7.33x−52.83x+187.17x−328.27x+316<y<1.2x−22x+158.5x−561.5x+984.8x−588 (2<X<5).