US3946897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drum cover made from thermoplastic rubber
Assignee: Uniroyal Chemical Co Inc
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Filing: 1974-03-25
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Granted: 1976-03-30
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Expires: 1994-03-25
Abstract
Abstract A cover for a drum made of a thermoplastic elastomeric blend of poly-alpha-olefin plastic (e.g., polypropylene, 40%) with EPM or EPDM (e.g., ethylene-propylene-5-ethylidene-2-norbornene terpolymer, 60%).
Inventors
- 👤 Anthony P. Wolff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:25
CPC Classifications
B; B65; B65D; B65D43/00; B65D43/02; B65D43/0202; B65D43/0204; B65D43/0212; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K5/00; C08K5/04; C08K5/14; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/16; B65D2543/00; B65D2543/00009; B65D2543/00018; B65D2543/00259; B65D2543/00296; B65D2543/00342; B65D2543/00398; B65D2543/00416; B65D2543/00444; B65D2543/00481; B65D2543/0049; B65D2543/00527; B65D2543/00537; B65D2543/00592; B65D2543/00601; B65D2543/00611; B65D2543/0062; B65D2543/00675; B65D2543/00685; B65D2543/00712; B65D2543/00722; B65D2543/00731; B65D2543/00787; B65D2543/00796; C08L2312/00; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
149 words
A removable, elastic, protective drum cover comprising a disc made of a thermoplastic elastomer which is a blend of from 50 to 10% by weight of a poly-alpha-olefin plastic and correspondingly from 50 to 90% by weight of a rubbery copolymer of ethylene and propylene with or without a copolymerizable non-conjugated diene, said disc having a peripheral lip adapted to stretch over and frictionally engage the end of a drum and then retract snugly to form an effective protective seal therewith while remaining removable from the drum, thereby protecting the complete head of the drum from dirt and adverse atmospheric influences, the said cover providing non-slip characteristics, and being capable of withstanding pressures up to 6000 pounds while retaining the ability to protect the head of the drum, the said cover being durable and movable from one drum to another to provide at least 30 reuses of the cover.
Claim 2
Dependent Claim
149 words
A removable, elastic, protective drum cover comprising a disc made of a thermoplastic elastomer which is a blend of from 50 to 10% by weight of a poly-alpha-olefin plastic and correspondingly from 50 to 90% by weight of a rubbery copolymer of ethylene and propylene with or without a copolymerizable non-conjugated diene, said disc having a peripheral lip adapted to stretch over and frictionally engage the end of a drum and then retract snugly to form an effective protective seal therewith while remaining removable from the drum, thereby protecting the complete head of the drum from dirt and adverse atmospheric influences, the said cover providing non-slip characteristics, and being capable of withstanding pressures up to 6000 pounds while retaining the ability to protect the head of the drum, the said cover being durable and movable from one drum to another to provide at least 30 reuses of the cover.
Claim 3
Dependent Claim
19 words
A drum cover as in claim 1 having a plurality of raised concentric ridges on the upper surface thereof.
Claim 4
Dependent Claim
22 words
A drum cover as in claim 1 in which the said blend is a blend of polypropylene plastic with ethylene-propylene-non-conjugated diene elastomer.
Claim 5
Dependent Claim
18 words
A drum cover as in claim 3 in which the blend contains a small amount of carbon black.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |