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:
Aug. 22, 1978
Filed:
Oct. 20, 1976
William A Hanson, Westlake Village, CA (US);
Graham S Barr, Canoga Park, CA (US);
Hanson Research Corporation, Northridge, CA (US);
Abstract
An automated sample changing chemical analysis system for sequentially analyzing a series of samples such as pharmaceutical chemical samples, the system being particularly useful for dissolution rate testing. A pressure/vacuum source provides motivation for withdrawing each sample from its respective source in sequence through a sample selector valve and transporting the sample to the flow cell of a chemical analyzer such as an U.V. Spectrophotometer, and then returning all or part of the sample to its source through the same selector valve and purging the flow cell and conduits back to the sample source. In one form each sample is simply drawn by vacuum from its source through the selector valve into the flow cell and then the entire sample is returned after analysis, by air pressure, back through the selector valve to the source, while in another form a diluent or reagent is mixed with the sample in an intermediate step to bring the sample within the testing range of the analyzer. Novel microporous filter stop means is employed to protect the pressure/vacuum source from system liquids, to accurately measure a quantity of diluent or reagent to be mixed with the sample, and to minimize bubbles in the system.