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:
Dec. 07, 2004
Filed:
Sep. 30, 2002
Frank Zhishi Xia, South El Monte, CA (US);
Mary Ziping Luo, South El Monte, CA (US);
Jack Yongfeng Zhang, South El Monte, CA (US);
Amphastar Pharmaceuticals Inc., Rancho Cucamonga, CA (US);
Abstract
A uniform small particle homogenizer for liquid product comprising a pair of intensifier cylinder pumps ( ) driven by a hydraulic system ( ). The pumps have a power stroke side and a suction stroke side, and a pair of proximity sensors ( ) that interface with each pump to detect forward and rearward movement. A microprocessor ( ) with timing capabilities controls the sequential operation of each pump with the power stroke of each pump timed to alternately produce a flow of the liquid product with a precisely timed flow overlap period from the alternating pumps. Since the power stroke takes a longer time than the suction stroke, the instant each power stroke is started the opposite pump is timed to hesitate and slightly overlap until a constant product flow-rate is produced from the alternating pumps, which eliminates large variances in pressure and therefore achieves uniformity in product particle size.