[12] Patent
[11] Patent No.:GC0007549  
[45] Date of Publishing the Grant of the Patent: 30/Apr /2018                48/2018  
Number of the Decision to Grant the Patent:2018/125881
Date of the Decision to Grant the Patent:10/Apr/2018

[21] Application No.:GC 2011-20052

[22] Filing Date:18/12/2011

[30] Priority:

[33] State [32] Priority date [31] Priority No.
US
22/12/2010
12/976,190

[72] Inventors:1- Srinivas VEERAMASUNENIŲŒ2- Qiang YU

[73] Owner: United States Gypsum Company, 550 W. Adams. St., IL 60661, Chicago, USA

[74] Agent: Suleiman I. Al-Ammar Law Office

  

 

  

[51]IPC:
Int. Cl.: C04B28/14 (2006.01)

[56] Cited Documents:

-WO 01/76649 A1 (BONE SUPPORT AB [SE]; LI OGREN LARS [SE]) 18 October 2001
-WO 02/05861 A1 (BONE SUPPORT AB [SE]; LI OGREN LARS [SE]) 24 January 2002
 
Examiner: Eng. Fahad M. AlBaker

[54] SET ACCELERATOR FOR GYPSUM HYDRATION
[57] Abstract: In a first embodiment of the invention, aged brushite is combined with calcium sulfate hemihydrate and water to make a gypsum slurry. Aged brushite slurry behaves similarly to calcium sulfate dihydrate to act as a seed crystal and rapidly initiate crystallization. The brushite slurry does not require the addition of a coating to maintain its activity over time compared to calcium sulfate dihydrate set accelerators. A gypsum-based product made using brushite slurry as the set accelerator is a second embodiment. The product has the brushite molecules integrated as part of the calcium sulfate dihydrate matrix and is distributed throughout the matrix.
No. of claims: 6


 

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