Patent US3904070A successfully refreshed from Google Patents.
US3904070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fireproof waste container cover
Assignee: Protectoseal Co
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Filing: 1973-09-10
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Granted: 1975-09-09
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Expires: 1993-09-10
Abstract
Abstract A removable cover for a waste paper and rag container has a downwardly directed and inwardly convergent top surface with an annular duct radially converging inwardly on a central opening normally used for introducing waste material therein but also, in the case of a fire, for directing the convective circulatory flow of combustion gases back into the container and has a curtain thereacross for sealing off the inflow of fresh air therethrough in the prevention of combustion of waste material therein and the snuffing of flame in the container.
Inventors
- 👤 Constantine Lisciani
- 👤 William J Zehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:37
CPC Classifications
B; B65; B65F; B65F1/00; B65F1/14; B65F1/16; B65F1/1607; B65F2001/1494; Y; Y10; Y10S; Y10S220/00; Y10S220/908
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
185 words
A fireproofed waste drum open for its full area at the top circumferential edge thereof, in combination with a removable cover installable on said circumferential edge comprising: a. a drum having a circumferential rolled edge around its open top, b. a cover having a flange disposed on said rolled edge, said flange having an inner rim which is connected to an annular coaxial baffle, said baffle having a downwardly concave curvature and the inner edge of said annular baffle lies in a plane substantially below the plane containing said inner rim of said flange, c. a ring fastened to said flange, said ring sloping outwardly and downwardly over said circumferential rolled edge of said drum and terminating in a second rolled edge, said second rolled edge being disposed lower than the rolled edge of said drum to provide a snug fit therebetween, d. said ring connected to an upwardly and inwardly sloped circumferential crown and thereafter sloped downwardly and radially concave inwardly to form a second baffle which converges with, but does not touch said first baffle, said second baffle terminating in a second opening.
Claim 2
Dependent Claim
185 words
A fireproofed waste drum open for its full area at the top circumferential edge thereof, in combination with a removable cover installable on said circumferential edge comprising: a. a drum having a circumferential rolled edge around its open top, b. a cover having a flange disposed on said rolled edge, said flange having an inner rim which is connected to an annular coaxial baffle, said baffle having a downwardly concave curvature and the inner edge of said annular baffle lies in a plane substantially below the plane containing said inner rim of said flange, c. a ring fastened to said flange, said ring sloping outwardly and downwardly over said circumferential rolled edge of said drum and terminating in a second rolled edge, said second rolled edge being disposed lower than the rolled edge of said drum to provide a snug fit therebetween, d. said ring connected to an upwardly and inwardly sloped circumferential crown and thereafter sloped downwardly and radially concave inwardly to form a second baffle which converges with, but does not touch said first baffle, said second baffle terminating in a second opening.
Claim 3
Dependent Claim
81 words
The sealed fireproofed waste drum in combination with the removable cover as set forth in claim 1 wherein the first baffle contains a plurality of vent apertures in an all over pattern whereby the convective flow of the products of combustion will be directed to flow upwardly through said apertures in the area between the spaced baffles and flow inwardly and downwardly across the openings in said baffles to form a curtain thereacross for sealing off the inflow of outside air.
Claim 4
Dependent Claim
27 words
Apparatus as described in claim 1 wherein the second rolled edge is provided with three equispaced indentations to tightly engage said first rolled edge of said drum.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |