Self-diagnostic gel permeation/size exclusion chromatograph

Patent 4674323 Issued on June 23, 1987. Estimated Expiration Date:

July 31, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Apparatus for liquid chromatography having automatic sampling system
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Inventors

Application

No. 06/761076 filed on 07/31/1985

US Classes:

73/61.52, Chromatography422/70, Liquid chromatography702/25Liquid mixture (e.g., solid-liquid, liquid-liquid)

Examiners

Primary: Levy, Stuart S.
Assistant: Roskos, Joseph W.

International Classes

G01N 30/00 (20060101)
G01N 30/88 (20060101)
G01N 30/02 (20060101)
G01N 30/62 (20060101)
G01N 30/86 (20060101)
G01N 33/44 (20060101)

Abstract

A SEC/GPC chromatograph which includes columns for fractionating polymers samples by molecular weight, conveying apparatus for causing a stream of solvent to flow through the columns from a source of this solvent, a rotary injection valve for sequentially injecting a series of polymer samples into the solvent stream ahead of the columns, a detector for generating a peak signal indicative of the molecular weight of the fractionated polymer samples eluting from the columns and a computer controller for processing the peak signal from the detector into a molecular weight distribution output, and for controlling the valve, and for performing several self-diagnostic tests.

Other References

NiKelly, J. G. et al. Pulse Dampener for High Press-Liquid Chromat. In Analy. Chem., vol. 51 (9), pp. 1585-1588, Aug. 1979
Mills, A. D. et al. An Automated System for Chromatogrphic Analysis, In Philips Res. Lab. Annual Rev. (G.B.) pp. 38-40, 1978
Paper entitled "Modern Size-Exclusion Liquid Chromatography" by W. W. Yau, J. J. Kirkland and D. D. Bly, 1979, Index and pp. 38-42
Advances in Instrumentation, vol. 35, Part 2, Proceedings of the ISA Conference and Exhibit, Oct., 1980, authored by R. A. Mowery, Jr. brochure entitled HP 1090 GPC System, by Hewlett Packard
Article entitled "On-Line Process Size-Exclusion Chromatogrphy" by R. A. Mowery, Jr., En. N. Fuller and R. K. Bade, reprinted from American Laboratory, May, 1982
Brochure entitled "OPTICHROM 2100 Process Chromatograph System" of Applied Automation, Inc
Article entitled "Water Systems for Liquid and Gel Permeation Chromatography"
Brochure entitled "The Waters 840"
Article entitled "Gel Permeation Analyzes Polymers", C & EN, Dec. 17, 1962
"Gel Permeation Chromatography, I. A New Method for Molecular Weight Distribution of High Polymers" from Journal of Polymer Scient: Part A, vol. 2, pp. 835-843, 1964