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. 20, 1988
Filed:
Nov. 03, 1987
Richard Gundelfinger, Cotati, CA (US);
Rheodyne Incorporated, Cotati, CA (US);
Abstract
A frame is described, that is part of an injector which is used to load a sample at high pressure into a chromatographic column, wherein a tube coupling hole in the frame can not only couple to a standard 1/16th inch tube, but can also couple to a much smaller diameter tube which is useful for minimizing dispersion when small samples or small chromatographic columns are used. The tube coupling hole has a cylindrical inner end portion of a diameter substantially equal to the smaller tube diameter to closely receive it, a tapered middle portion, and a threaded outer portion. Ferrules for sealing tubes to the tapered hole portion, include a first ferrule having a hole that closely surrounds the smaller diameter tube, with the end of the tube lying in the cylindrical inner end portion. A second ferrule has a hole that closely surrounds the standard size larger tube, the tip of the larger tube lying against the tapered hole portion.