Hepa filtered storage canisters
AssigneeNuclear Filter Technology, Inc.
InventorsTerry J. Wickland, Carl Stephens
Life of this patent
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Abstract
Plutonium powders are stored in stainless steel canisters with stainless steel lids. The stainless steel canisters are extruded and have no interior welds. Each canister includes a vent with an integral HEPA filter. The canisters are of various capacities and nest, one within another, when not used for storage.
Claims20
A canister for containing hazardous material, the canister comprising:
- a seamless canister body of a first thickness, the canister body having a mouth defined by a rolled edge with a depending annular lip;
- a collar having second thickness greater than the first thickness and being welded to the annular lip, the collar having an external helical thread formed therein;
- a lid having a plate portion and a depending rim portion, the depending rim portion having internal threads for threadably engaging the threads of the collar for retaining the lid on the canister body;
- an annular gasket disposed on the lid for sealing with the rolled edge defining the mouth of the container;
- and
- a filter assembly integral with the lid.
A canister for storing hazardous material, such as powdered uranium oxides and salts, the canister comprising:
- an extruded, seamless canister body of stainless steel, the canister body having a wide mouth surrounded by an annular lip;
- a stainless steel collar having a thickness greater than that of the canister by being welded to the annular lip, the collar having a helical thread formed thereon;
- a stainless steel lid having a plate portion and a depending rim portion, the depending rim portion having threads for threadably engaging the threads of the collar for retaining the lid on the canister body;
- an annular gasket disposed on the lid for sealing with the mouth of the container;
- and
- an HEPA filter assembly integral with the lid.
A plurality of canisters for storing hazardous material, such as radioactive materials, each canister comprising:
- an extruded, seamless canister body of stainless steel, the canister body having a wide mouth surrounded by an annular lip;
- a stainless steel collar having a thickness greater than that of the canister and being welded to the annular lip, the collar having a helical thread formed therein;
- a stainless steel lid having a plate portion and a depending rim portion, the depending rim portion having threads for threadably engaging the threads of the collar for retaining the lid on the canister body;
- an annular gasket disposed on the lid for sealing with the mouth of the container;
- and
- an HEPA filter assembly integral with the lid;
- wherein each canister is of a different capacity and of dimensions that it nests with the other canisters, the smaller canisters all fitting within the largest canister.
Dependencies are inferred from the claim text.