US3848418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underground storage tank for low temperature liquefied gas
Assignee: Ohbayashi Gumi Ltd
•
Filing: 1973-04-12
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Granted: 1974-11-19
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Expires: 1993-04-12
Abstract
Abstract An underground storage tank for a low temperature liquefied gas is provided in which a floor slab of the tank comprises an upper floor slab section placed upon excavated bottom of the soil, a lower floor slab section, and a plurality of supporting members interposed between said upper and lower floor slab sections. A side wall of the tank extends to the lower floor slab section in contact therewith and forms an adiabatic space free from the soil inside of the side wall between the upper and lower floor slab sections and the supporting members.
Inventors
- 👤 K Takase
- 👤 H Miyakoshi
- 👤 M Ohmura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:33
CPC Classifications
F; F17; F17C; F17C3/00; F17C3/005; F17C2203/00; F17C2203/06; F17C2203/0634; F17C2203/0678
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
An underground storage tank for a low temperature liquefied gas comprising a top closure cover outside of ground, a concrete annular side wall deeply extending in the ground, a concrete floor slab provided at a level lower than a ground-water level, and an insulation for keeping, at least, the upper portion of said tank to a low temperature, wherein said floor slab comprises an upper floor slab section, a lower floor slab section placed upon the excavated bottom of the soil, and a plurality of supporting members interposed between said upper and lower floor slab sections, said annular side wall extending to said lower floor slab section in contact therewith and forming an adiabatic space free from the soil inside of said side wall between said upper and lower floor slab sections and said supporting members.
Claim 2
Dependent Claim
136 words
An underground storage tank for a low temperature liquefied gas comprising a top closure cover outside of ground, a concrete annular side wall deeply extending in the ground, a concrete floor slab provided at a level lower than a ground-water level, and an insulation for keeping, at least, the upper portion of said tank to a low temperature, wherein said floor slab comprises an upper floor slab section, a lower floor slab section placed upon the excavated bottom of the soil, and a plurality of supporting members interposed between said upper and lower floor slab sections, said annular side wall extending to said lower floor slab section in contact therewith and forming an adiabatic space free from the soil inside of said side wall between said upper and lower floor slab sections and said supporting members.
Claim 3
Dependent Claim
62 words
An underground storage tank as claimed in claim 1, further comprising a heating means provided in said adiabatic space for keeping the underside of said lower floor slab section to a temperature higher than a freezing temperature of soil under said lower floor slab section and a tunnel and a vertical shaft leading said adiabatic space to the surface of the ground.
Claim 4
Dependent Claim
60 words
An underground storage tank as claimed in claim 1, wherein said annular side wall of said tank further extends to a level lower than said lower floor slab section and an artesian pressure reducing system is provided through said lower floor slab section for drawing ground-water from a place enclosed by said lower floor slab section and said side wall.
Claim 5
Dependent Claim
59 words
An underground storage tank as claimed in claim 1, wherein said lower floor slab section is thick enough to resist against the uplift of the groundwater, the thickness and weight of said lower floor slab section being in proportion to the height of the ground-water level from the said lower floor slab section and the diameter of said tank.
Claim 6
Dependent Claim
53 words
An underground storage tank as claimed in claim 1, wherein said concrete annular side wall comprises an outer side wall deeply extending in the ground beyond said lower floor slab section, and an inner side wall contacting with said outer side wall and terminating at said lower floor slab section in contact therewith.
Claim 7
Dependent Claim
53 words
An underground storage tank as claimed in claim 1, wherein said concrete annular side wall comprises an outer side wall whose lower end terminates at said lower floor slab section and in contact therewith, an an inner side wall contacting with said outer side wall and terminating at said upper floor slab section.
References Cited (Backward Citations)
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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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |