Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1975-11-10
1976-10-12
Watkins, Donald E.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
210198C, G01N 3108
Patent
active
039850218
ABSTRACT:
A liquid chromatography system, including a reservoir for a liquid mobile phase, a liquid chromatography column, reciprocating pumping means for pumping the mobile phase through the column, and motor means for driving the pumping means through successive reciprocation cycles. Means are provided for controlling the rotational speed of the motor throughout the reciprocation cycle of the pump, so as to provide preselected average rotational speeds over predetermined subintervals of each successive reciprocation cycle. Application of the control cycle is synchronized with the pump cycle so that the said speed control is properly applied over each successive reciprocation cycle.
REFERENCES:
patent: 3446057 (1969-05-01), Bakalyar et al.
patent: 3537585 (1970-11-01), Waters
patent: 3701609 (1972-10-01), Bailey
patent: 3855129 (1974-12-01), Abrahams et al.
patent: 3934456 (1976-01-01), Munk
Achener Pierre Y.
Boehme Detlef R.
Judah Kenneth C.
Cole Stanley Z.
Fisher Gerald M.
Morrissey John J.
Roskos Joseph W.
Varian Associates
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