Cryogenic storage container
First Claim
Patent Images
1. A container for storing materials at low temperatures comprising an inner vessel for holding such material;
- a larger outer gas-tight casing having rigid self-supporting walls around said inner vessel of such size to form an intervening evacuated load-free space at an absolute pressure less than about 0.5 micron mercury, said space containing multi-layered thermal insulation comprising thin flexible sheet radiation barriers being supported by and in alternating relation with low conductive fibrous sheet layers in the permanently pre-compacted form weighing less than 2 grams/ft2 and being comprised of fibers having 3-40 microns effective diameter and an intrinsic thermal conductivity of less than 0.2 BTU/hr-ft2 -F/ft, said fibers being arranged in overlaying crossing relationship in planes parallel to the sheet surface with at least 1% (by number) of the fibers being heat softenable and heat self-bonded directly to each other at some of the cross-points without external binder, and said fibrous sheet layers undulating within the spacing between adjacent radiation shields over a transverse distance substantially wider than its thickness, contacting first one shield than the other facing shield.
1 Assignment
0 Petitions
Accused Products
Abstract
A double walled cryogenic storage container with a vacuum space containing multi-layer insulation comprising thin radiation layers separated by permanently precompressed sheets comprising fibers having 3-40 microns effective diameter in stacked crossing relationship and at least 1% of the fibers being heat softenable and heat bonded together at cross points without external binder.
69 Citations
9 Claims
-
1. A container for storing materials at low temperatures comprising an inner vessel for holding such material;
- a larger outer gas-tight casing having rigid self-supporting walls around said inner vessel of such size to form an intervening evacuated load-free space at an absolute pressure less than about 0.5 micron mercury, said space containing multi-layered thermal insulation comprising thin flexible sheet radiation barriers being supported by and in alternating relation with low conductive fibrous sheet layers in the permanently pre-compacted form weighing less than 2 grams/ft2 and being comprised of fibers having 3-40 microns effective diameter and an intrinsic thermal conductivity of less than 0.2 BTU/hr-ft2 -F/ft, said fibers being arranged in overlaying crossing relationship in planes parallel to the sheet surface with at least 1% (by number) of the fibers being heat softenable and heat self-bonded directly to each other at some of the cross-points without external binder, and said fibrous sheet layers undulating within the spacing between adjacent radiation shields over a transverse distance substantially wider than its thickness, contacting first one shield than the other facing shield.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
Specification