US3931908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated tank
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1973-08-02
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Granted: 1976-01-13
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Expires: 1993-08-02
Abstract
Abstract This invention relates to an improved corner construction for cryogenic tanks of generally rectilinear cross section wherein the internal surfaces of the tank are insulated with a foamed material which is in direct contact with cryogenic liquid.
Inventors
- 👤 Dan R. Cheyney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:40
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/38; B65D81/3802; B65D81/3811; B65D25/00; B65D25/14; F; F17; F17C; F17C3/00; F17C3/02; F17C3/04; F17C3/06; F17C2201/00; F17C2201/05; F17C2201/052; F17C2203/00; F17C2203/03; F17C2203/0304; F17C2203/0308; F17C2203/032; F17C2203/0329; F17C2203/0333; F17C2203/0345; F17C2203/06; F17C2203/0602; F17C2203/0612; F17C2203/0626; F17C2203/0629; F17C2203/0634; F17C2203/0636; F17C2203/0639; F17C2203/0643; F17C2203/0646; F17C2203/0648; F17C2203/0651; F17C2221/00; F17C2221/03; F17C2221/032; F17C2221/033; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; F17C2223/03; F17C2223/033; F17C2260/00; F17C2260/01; F17C2260/011; F17C2270/00; F17C2270/01; F17C2270/0102; F17C2270/0105; F17C2270/011; Y; Y10; Y10S; Y10S220/00; Y10S220/901; Y10S220/902
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
In a metallic tank capable of storing or transporting large volumes of liquid at temperatures from about -70° to -400°F., said tank having a generally rectilinear cross section, wherein the internal surface of said tank is lined with a foamed insulation on at least the upstanding walls and the floor thereof, an improved corner joint construction between the wall insulation and the floor insulation comprising a layer of foam in the corner, abutting the wall insulation and the floor insulation and having a density of at least one pound per cubic foot greater than the wall and floor foam insulation and having incorporated in said denser foam an interlayer consisting of flexible webbing of generally retiform construction, said flexible webbing extending beyond said denser foam and incorporated into the abutting layers of lower-density foam affixed to the wall and floor of said tank.
Claim 2
Dependent Claim
143 words
In a metallic tank capable of storing or transporting large volumes of liquid at temperatures from about -70° to -400°F., said tank having a generally rectilinear cross section, wherein the internal surface of said tank is lined with a foamed insulation on at least the upstanding walls and the floor thereof, an improved corner joint construction between the wall insulation and the floor insulation comprising a layer of foam in the corner, abutting the wall insulation and the floor insulation and having a density of at least one pound per cubic foot greater than the wall and floor foam insulation and having incorporated in said denser foam an interlayer consisting of flexible webbing of generally retiform construction, said flexible webbing extending beyond said denser foam and incorporated into the abutting layers of lower-density foam affixed to the wall and floor of said tank.
Claim 3
Dependent Claim
16 words
The metallic tank of claim 1 wherein said foamed insulation is a closed cell polyurethane foam.
Claim 4
Dependent Claim
50 words
The tank of claim 2 wherein the wall and floor insulation is a closed cell foam having a density from about 2 to 5 pounds per cubic foot and the corner insulation is a denser closed cell foam having a density of about 4 to 10 pounds per cubic foot.
Claim 5
Dependent Claim
23 words
The tank of claim 1 wherein said webbing is of a material selected from the group consisting of nylon, fiberglass, burlap and polyester.
Claim 6
Dependent Claim
40 words
The tank of claim 3 wherein an additional layer of polyurethane foam having a density of about 2 to 5 pounds per cubic foot is bonded to the exposed inner surface of said wall insulation, floor insulation and joint insulation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |