IP Library Granted Patent US 7,909,367
Granted Patent B2
US 7,909,367 · App. 11/072,485 · Granted Mar 22, 2011

Capillary interconnection fitting and method of holding capillary tubing

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Quick Facts
Patent No.
US 7,909,367
App. No.
11/072,485
Granted
Mar 22, 2011
Kind
B2
Abstract

The present invention is a capillary interconnection fitting and method of clamping a capillary in the fitting that separates a forward ferrule that holds the capillary from a secondary clamping device. The fitting comprises a sealing ferrule, a compression screw and a clamping device. The ferrule is fitted in a compression screw that mates to a fluidic component. The clamping device is decoupled from the ferrule and coupled to the compression screw.

Claims (13)

1. A capillary interconnection fitting comprising:

a forward fluidic sealing ferrule with an axial bore adapted to receive a capillary and a distal end adapted to connect to a fluidic component;

a compression screw receiving the proximal end of the ferrule at a distal end having an axial bore aligned with the bore of the ferrule; and

a clamping device connected to the proximal end of the compression screw and adapted to provide clamping pressure to the capillary; and the clamping device comprises a clamping collet that is activated by a clamping nut having a frusto-conical interior the bias of which is complimentary to the collet and adapted to mate to the distal end of the compression screw.

2. A fitting as in claim 1 further comprising:

a locating pin that passes through a portion of the compression screw and the collet whereby the collet is held in place relative to the compression screw.

3. A fitting as in claim 1 wherein:

the clamping nut mates to the compression screw by complimentary threaded means.

4. The fitting as in claim 1 further comprising a capillary sleeve adapted to be disposed about the length of the capillary, interior to the clamping device and the compression screw.

5. A fitting as in claim 4 wherein:

the diameter of the bore through the forward ferrule narrows at its distal end preventing the capillary sleeve from passing fully through the ferrule and for allowing only a capillary to pass fully through the ferrule.

6. A fitting as in claim 4 wherein:

the clamping device comprises a clamping collet that is activated by a clamping collar with a biased bore adapted to activate the collet.

Assignments (2)
MERGER Recorded Jun 17, 2009
From: WATERS INVESTMENTS LIMITED
To: WATERS TECHNOLOGIES CORPORATION
Reel/Frame 022837/0404 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 6, 2006
From: PLANT, KENNETH R.; GERHARDT, GEOFF C.; CORMLER, SYLVAIN G.
To: WATERS INVESTMENTS LIMITED
Reel/Frame 017277/0777 →