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US 4,066,183 AGranted
Chromatographic septum having polyimide coating
AssigneeL. C. Company, Inc.
InventorNelson W. Armstrong
Life of this patent
Estimating the term…
Abstract
Improved septa for chromatographic apparatus and procedures comprise disc or cylindrical bodies of silicone rubber with a coating of polyimide which may in turn be covered by a coating of Teflon.
Claims4
In a chromatographic septum comprising a body of hypodermic needle penetrable self-healing rubber adapted to serve as a closure for a container or chromatographic system, the improvement which comprises covering the surface of the septum that is to be exposed to the interior of the container or system with a coating of polyimide polymer.
Dependencies are inferred from the claim text.