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US 4,515,397 AGranted
Vacuum insulated conduit
AssigneeUnion Carbide Corporation
InventorsJeffert J. Nowobilski, Kenneth C. Kather
Life of this patent
Estimating the term…
Abstract
A vacuum insulated conduit exhibiting reduced thermal leakage through a joint area wherein the evacuated space between inner and outer pipes is reduced in the joint area by a plate from the outer pipe to bellows covering the inner pipe which form the major heat transfer pathway.
Claims18
A conduit having reduced thermal leakage at a joint area comprising:
- (A) a first pipe having an end thereof;
- (B) a second pipe having a diameter greater than that of said first pipe, positioned circumferentially around and axially along said first pipe, terminating at a point short of said first pipe end to define an axial distance from said point to said first pipe end;
- (C) bellows, attached at one axial end thereof to said first pipe, having a diameter greater than that of said first pipe but less than 25 percent of the distance between the first and second pipes, positioned circumferentially around and axially along said first pipe along, at least a part of, said axial distance;
- and
- (D) a plate having a solid radial dimension from the furthest radial extent of said bellows to said second pipe, substantially perpendicular to said pipes, connecting said bellows, at the other axial end thereof, with said second pipe and free from contact with said first pipe.
2 more elements
Dependencies are inferred from the claim text.