US3735895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite non-sweat water tank
Assignee: Water Resources International Inc
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Filing: 1971-05-24
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Granted: 1973-05-29
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Expires: 1991-05-24
Abstract
Abstract A water tank in which an inner cylindrical vessel, of molded plastic wound with reinforcing strands has a base affixed to its lower end and is enclosed in an outer, cylindrical shell which seats in an upper edge of the base. The shell is reflective externally and air space is provided interiorly, so that the tank does not sweat.
Inventors
- 👤 J D Roper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:20
CPC Classifications
B; B65; B65D; B65D25/00; B65D25/14; B65D25/20; B65D25/24; B65D25/34; C; C02; C02F; C02F1/00; C02F1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A composite water tank for use in water purifying and softening systems, comprising: an inner seLf-supporting tank of plastic material, a fitting on top of said inner tank for connecting the inner tank in the water system, a base on the bottom of said inner tank forming a support, and an outer tank covering said inner tank engaged with said base and with the top of said inner tank, said outer tank having an opening in which said fitting is disposed, said inner tank comprising an inner molded plastic shell and an outer shell of filament reinforced plastic including glass fiber windings on said inner shell and a resin binder, said base being affixed to the bottom of said inner tank and having an upwardly opening groove receiving the lower end of said outer tank, and said outer tank having a reflective exterior surface.
Claim 2
Dependent Claim
144 words
A composite water tank for use in water purifying and softening systems, comprising: an inner seLf-supporting tank of plastic material, a fitting on top of said inner tank for connecting the inner tank in the water system, a base on the bottom of said inner tank forming a support, and an outer tank covering said inner tank engaged with said base and with the top of said inner tank, said outer tank having an opening in which said fitting is disposed, said inner tank comprising an inner molded plastic shell and an outer shell of filament reinforced plastic including glass fiber windings on said inner shell and a resin binder, said base being affixed to the bottom of said inner tank and having an upwardly opening groove receiving the lower end of said outer tank, and said outer tank having a reflective exterior surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |