US3841041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tank for a swimming pool or the like
Assignee: Individual
•
Filing: 1973-05-21
•
Granted: 1974-10-15
•
Expires: 1993-05-21
Abstract
Abstract A tank of the swimming-pool type formed of rigid plastic material such as polyurethane foam and provided with a fluidtight lining of small thickness is placed directly in contact with the soil within a pit which has been dug in the ground. The modulus of elasticity of the side wall and preferably of the bottom is close in value to that of the surrounding soil so as to result in a uniform stress distribution and a deformability which removes any danger of crack formation.
Inventors
- 👤 J Friedland
- 👤 P Habib
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:05
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/14; E04H4/141; E04H4/142
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
107 words
A swimming-pool tank in a pit in the ground with a wall adjacent to the soil of said pit and having a fluid-tight inner lining, wherein the value of the modulus of elasticity of said wall is equal at a maximum value to twice the modulus of elasticity of the soil in the vicinity of said pit, wherein the maximum thickness e of the Wall in centimeters is about e 1/4 . 2,500. s/E where E is the modulus of elasticity and s the ultimate tensile strength of said wall, said wall further comprising rigid anchoring means embedded therein and projecting into the soil of said pit.
Claim 2
Dependent Claim
107 words
A swimming-pool tank in a pit in the ground with a wall adjacent to the soil of said pit and having a fluid-tight inner lining, wherein the value of the modulus of elasticity of said wall is equal at a maximum value to twice the modulus of elasticity of the soil in the vicinity of said pit, wherein the maximum thickness e of the Wall in centimeters is about e 1/4 . 2,500. s/E where E is the modulus of elasticity and s the ultimate tensile strength of said wall, said wall further comprising rigid anchoring means embedded therein and projecting into the soil of said pit.
Claim 3
Dependent Claim
63 words
A swimming-pool tank according to claim 1 and in which the wall is adjacent to soil having a modulus of elasticity within the range of 50 to 100 daN/cm2, wherein the wall is made of rigid polyurethane foam having a specific density within the range of 0.03 to 0.15 g/cm3 and a modulus of elasticity within the range of 50 to 200 daN/cm2.
References Cited (Backward Citations)
US2333315A
Cited
US3031801A
Cited
US3015191A
Cited
US3429035A
Cited
US3660957A
Cited
US3610564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |