US4345581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bottom construction of ponds particularly solar ponds
Assignee: Solmat Systems Ltd
•
Filing: 1980-12-19
•
Granted: 1982-08-24
•
Expires: 2000-12-19
Abstract
Abstract A pond construction, especially useful for non-convective solar ponds, having a multi-layer bottom in order to minimize seepage of liquid through the pond bottom. Liquid which permeates the multi-layer construction is pumped back into the pond.
Inventors
- 👤 Sraya Shacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:16
CPC Classifications
F; F24; F24S; F24S10/00; F24S10/10; F24S10/13; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y02E10/44
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
125 words
A pond containing a body of liquid, characterized in that, in order to minimize seepage of the liquid through the pond bottom, the pond comprises a multi-layer bottom construction over the natural earth and underlying the complete pond, which bottom construction includes an upper layer of a permeable material having a low degree of permeability to the liquid in the pond, an intermediate layer of a permeable material having a high degree of permeability to the liquid in the pond, and a bottom layer of a permeable material having a low degree of permeability to the liquid in the pond; and pumping means for returning the liquid which permeates through the upper layer into the intermediate layer, back to the pond above the upper layer.
Claim 2
Dependent Claim
125 words
A pond containing a body of liquid, characterized in that, in order to minimize seepage of the liquid through the pond bottom, the pond comprises a multi-layer bottom construction over the natural earth and underlying the complete pond, which bottom construction includes an upper layer of a permeable material having a low degree of permeability to the liquid in the pond, an intermediate layer of a permeable material having a high degree of permeability to the liquid in the pond, and a bottom layer of a permeable material having a low degree of permeability to the liquid in the pond; and pumping means for returning the liquid which permeates through the upper layer into the intermediate layer, back to the pond above the upper layer.
Claim 3
Dependent Claim
17 words
A pond according to claim 1, wherein the pond is a thermal pond containing a heated liquid.
Claim 4
Dependent Claim
25 words
A pond according to claim 2, wherein the pond is a non-convective solar pond containing a body of liquid to be heated by solar radiations.
Claim 5
Dependent Claim
67 words
A pond according to claim 1, wherein said pumping means comprises drainage piping located in said intermediate layer for receiving the liquid permeating through the upper layer, return piping communicating with the bottom of the pond above the upper layer, and a pump for pumping said permeating liquid from the drainage piping through the return piping back to the bottom of the pond above the upper layer.
Claim 6
Dependent Claim
21 words
A pond according to claim 4, wherein said pump is located in a sump receiving liquid drained via the drainage piping.
Claim 7
Dependent Claim
43 words
A pond according to claim 5, wherein said sump is vented to the atmosphere to remove gases evolved below the bottom of the pond and passed therefrom to the sump before return of the drained liquid back to the bottom of the pond.
Claim 8
Dependent Claim
57 words
A pond according to claim 1, wherein said pumping means is located laterally of the pond and includes a liquid level detector for automatically actuating the pumping means when the drained liquid in the sump exceeds a predetermined high level and for automatically stopping the pumping means when the drained liquid drops below a predetermined low level.
Claim 9
Dependent Claim
38 words
A pond according to claim 1, wherein the impermeable upper layer has a thickness less than that of the permeable intermediate layer, and wherein the latter layer has a thickness less than that of the impermeable lower layer.
Claim 10
Dependent Claim
23 words
A pond according to claim 1, wherein the upper and lower layers have a permeability of about 10 -5 to 10 -6 cm/sec.
Claim 11
Dependent Claim
40 words
A pond according to claim 1, wherein said drainage piping comprises a plurality of transversely extending drainage pipes spaced longitudinally of the pond and joined to a further collection pipe extending longitudinally of the pond and leading to said sump.
References Cited (Backward Citations)
US779703A
Cited
US861028A
Cited
US2984050A
Cited
US3152640A
Cited
US3411163A
Cited
US3415022A
Cited
US3660957A
Cited
US3854291A
Cited
US4039451A
Cited
US4112690A
Cited
US4178039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |