Yongjiang
Yongjiang Chen, Lianyungang CN
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20130072697 | PREPARATION PROCESS OF DRONEDARONE AND ITS SALTS - A process is provided for preparing dronedarone or pharmaceutically acceptable salts thereof. The process comprises reacting 5-amino-2-butyl-3-(4-[3-(dibutylamino)propoxy]benzoyl)benzofuran (compound A) with methanesulfonyl chloride without any catalyst to provide crude dronedarone hydrochloride, which is purified to afford highly pure product. Then, the dronedarone hydrochloride can be converted to highly pure dronedarone through treatment with an alkaline solvent, the dronedarone can be further converted to other pharmaceutically acceptable salts of dronedarone. In this process, acylation between compound A and methanesulfonyl chloride is carried out successfully and the formation of the dimethylsulfonyl by-product is inhibited. | 03-21-2013 |
Yongjiang Yi, Chengdu CN
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20150302024 | Storage System and Method for Processing Data Operation Request - A storage system and a method for processing a data operation request are disclosed. The method is applied to a storage system that has a write once read many (WORM) function. In the method, after the storage system receives a data operation request, which is used to change data stored in the storage system, sent by an application server, the storage system acquires a time difference between a real-time clock (RTC) and a reference clock, wherein the RTC is configured to provide system time for the storage system, and the reference clock cannot be modified when the system is running. Then, the storage system determines whether the time difference is greater than an accumulated time precision error of the reference clock, and refuses to execute the data operation request when the time difference is greater than the accumulated time precision error. | 10-22-2015 |
Yongjiang Yu, Yantai CN
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20130093552 | Neodymium-Iron-Boron Magnet having Gradient Coercive Force and its Preparation Method - A neodymium-iron-boron (NdFeB) magnet having gradient coercive force and its preparation method are disclosed. The NdFeB magnet includes at least two NdFeB material layers having different coercive force, including an exterior layer having high coercive force and at least a medial layer having low coercive force. The exterior layer is connected to the medial layer via a sintered layer along an orientation direction. The NdFeB magnet has high magnetic properties and high resistance to magnetism loss. | 04-18-2013 |
20140352847 | METHOD FOR PREPARING R-FE-B BASED SINTERED MAGNET - A method for preparing an R—Fe—B based sintered magnet, including: preparing a R | 12-04-2014 |