Patent US3940809A successfully refreshed from Google Patents.
US3940809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swimming pool cover
Assignee: Lee Raymond Organization Inc
•
Filing: 1974-08-26
•
Granted: 1976-03-02
•
Expires: 1994-08-26
Abstract
Abstract A hollow air filled flexible horizontal endless plastic waterproof loop floats on top of the water in a swimming pool and is shaped to conform with and bear continuously against the inner periphery of the pool. The loop has an open central region. A thin flat flexible horizontal plastic waterproof sheet is disposed in the region to close same and is sealed at its periphery to the loop.
Inventors
- 👤 George A. Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:28
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/06; E04H4/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
In combination with a swimming pool containing water to a preselected level and having an inner periphery: A hollow air filled flexible waterproof endless loop shaped to conform to said periphery and floating on top of the water, the loop having an open central region and bearing continuously against the periphery, said loop in vertical cross section defining a circle and having a peripheral opening closed by a removable plug whereby the loop can be inflated for use and deflated for storage; and a thin flat flexible horizontal dark colored plastic waterproof sheet closing said region and sealed at its periphery to said loop, said sheet being adapted to float in water.
Claim 2
Dependent Claim
112 words
In combination with a swimming pool containing water to a preselected level and having an inner periphery: A hollow air filled flexible waterproof endless loop shaped to conform to said periphery and floating on top of the water, the loop having an open central region and bearing continuously against the periphery, said loop in vertical cross section defining a circle and having a peripheral opening closed by a removable plug whereby the loop can be inflated for use and deflated for storage; and a thin flat flexible horizontal dark colored plastic waterproof sheet closing said region and sealed at its periphery to said loop, said sheet being adapted to float in water.
Claim 3
Dependent Claim
31 words
The combination of claim 1 wherein said sheet is secured to the periphery of the loop and in extension is coincident with a horizontal diameter traversing the interior of the loop.
Claim 4
Dependent Claim
27 words
The combination of claim 1 wherein the sheet is secured to the periphery of the loop and in extension is tangent to the bottom of the loop.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |