Patent US4709833A successfully refreshed from Google Patents.
US4709833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotationally molded salvage drum and recessed lid
Assignee: ROTOCAST INTERNATIONAL Inc
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Filing: 1987-02-20
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Granted: 1987-12-01
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Expires: 2007-02-20
Abstract
Abstract An improved rotationally molded salvage drum and double-walled reinforced recessed lid is sealed and secured with a conventional ring clamp, and is provided with vertical column ribs projecting outward from generally cylindrical sidewalls; in a preferred embodiment the diameter of the lower section is smaller than that of the upper section to permit nesting of the empty stacked drums.
Inventors
- 👤 William J. Granberg
- 👤 Richard A. Wagner
- 👤 Gary W. Hundt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:46
CPC Classifications
B; B65; B65D; B65D88/00; B65D88/02; B65D88/12; G; G21; G21F; G21F5/00; G21F5/06; G21F5/12; B65D1/00; B65D1/12; B65D1/14; B65D1/16; B65D43/00; B65D43/02; B65D43/0202; B65D43/0214; B65D43/022; B65D45/00; B65D45/32; B65D2543/00; B65D2543/00009; B65D2543/00018; B65D2543/00064; B65D2543/00074; B65D2543/00092; B65D2543/00342; B65D2543/00398; B65D2543/00407; B65D2543/00416; B65D2543/00444; B65D2543/00481; B65D2543/0049; B65D2543/00537; B65D2543/00546; B65D2543/00953; B65D2543/00962; B65D2543/00972; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/80
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
74 words
In a rotationally molded polyethylene salvage drum having generally cylindrical sidewall and a lid, the improvement which comprises: a plurality of spaced apart vertical column ribs radially disposed from said sidewall, an outwardly projecting rim at the open end of the drum, and a double walled recessed lid with a circumferential reinforcing bead, wherein said reinforcing bead and said projecting rim are adapted to be secured by a ring clamp to seal the drum.
Claim 2
Dependent Claim
74 words
In a rotationally molded polyethylene salvage drum having generally cylindrical sidewall and a lid, the improvement which comprises: a plurality of spaced apart vertical column ribs radially disposed from said sidewall, an outwardly projecting rim at the open end of the drum, and a double walled recessed lid with a circumferential reinforcing bead, wherein said reinforcing bead and said projecting rim are adapted to be secured by a ring clamp to seal the drum.
Claim 3
Dependent Claim
14 words
The salvage drum of claim 1 where the lid is provided with reinforcing ribs.
Claim 4
Dependent Claim
16 words
The salvage drum of claim 2 where the lid reinforcing ribs are radial and inwardly disposed.
Claim 5
Dependent Claim
17 words
The salvage drum of claim 3 where the reinforcing ribs terminate proximate the underside of the lid.
Claim 6
Dependent Claim
32 words
The salvage drum of claim 1 where the outside diameter of the lower section of the salvage drum is smaller than the inside diameter of the upper section of the salvage drum.
Claim 7
Dependent Claim
17 words
The salvage drum of claim 5 where the lower and upper sections are approximately of equal height.
Claim 8
Dependent Claim
30 words
The salvage drum of claim 1 where the surface area of the vertical column ribs comprises from about 10% to about 25% of the exterior surface area of the drum.
Claim 9
Dependent Claim
28 words
The salvage drum of claim 1 where the vertical column ribs terminate at a position below the projecting rim that is proximate the underside of the recessed lid.
Claim 10
Dependent Claim
14 words
The improved salvage drum of claim 1 which further comprises an O-ring sealing gasket.
Claim 11
Dependent Claim
44 words
The improved salvage drum of claim 1 where the exterior bottom of the drum is provided with a recessed annular section and the lid is provided with a raised annular section adapted to mate with the bottom recess when the sealed units are stacked.
Claim 12
Dependent Claim
17 words
The improved salvage drum of claim 10 where the lid is provided with raised quarter annular sections.
Claim 13
Dependent Claim
16 words
The improved salvage drum of claim 2 where the inwardly disposed reinforcing ribs are generally trapezoidal.
Claim 14
Dependent Claim
38 words
The improved salvage drum of claim 1 where the lid is defined by upper and lower surfaces joined by a vertical sidewall and the vertical sidewall is adapted to fit closely within the open end of the drum.
Claim 15
Dependent Claim
22 words
The improved salvage drum of claim 1 where the lid reinforcing bead and the drum rim are of substantially the same diameter.
Claim 16
Dependent Claim
37 words
The improved salvage drum of claim 10 where the interior bottom surface of the salvage drum is provided with a raised annular section adapted to engage the rim of a metal drum that is to be contained.
Claim 17
Dependent Claim
30 words
The improved salvage drum of claim 1 where the double walled recessed lid when sealed is adapted to prevent a contained steel drum from tipping and shifting during rough handling.
Claim 18
Dependent Claim
21 words
The improved salvage drum of claim 5 which comprises at least one label plate in the upper section of the drum.
Claim 19
Dependent Claim
113 words
A rotationally molded polyethylene salvage drum comprising generally cylindrical sidewalls interrupted by a plurality of spaced apart outwardly projecting vertical column ribs, the drum having an upper section and a lower section wherein the outside diameter of the lower section is smaller that the inside diameter of the upper section, the open end of the drum terminating in an outwardly projecting rim, and a double walled recessed lid adapted to close the open end of the drum, where the upper surface of the lid terminates in a circumferential reinforcing bead, and said projecting drum rim and lid reinforcing bead when brought into touching alignment are adapted to be secured with a ring clamp.
Claim 20
Dependent Claim
113 words
A rotationally molded polyethylene salvage drum comprising generally cylindrical sidewalls interrupted by a plurality of spaced apart outwardly projecting vertical column ribs, the drum having an upper section and a lower section wherein the outside diameter of the lower section is smaller that the inside diameter of the upper section, the open end of the drum terminating in an outwardly projecting rim, and a double walled recessed lid adapted to close the open end of the drum, where the upper surface of the lid terminates in a circumferential reinforcing bead, and said projecting drum rim and lid reinforcing bead when brought into touching alignment are adapted to be secured with a ring clamp.
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) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |