US3828967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulator device
Assignee: WESTCOTT AND GRABHORN Ltd
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Filing: 1972-11-20
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Granted: 1974-08-13
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Expires: 1992-11-20
Abstract
Abstract A plastic, heat insulating ring whose lower perimeter is formed with an exterior bevel surface proportioned and designed to conform to, and be supported upon, the upwardly and outwardly flared lip of a conventional serving tray and whose upper perimeter is formed with a corresponding interior bevel surface proportioned and designed to conform to and support the external surface of such a tray lip, and a transverse divider within the ring which, in some instances, may be selectively positioned at various locations within the ring, and in some instances may be nonrectilinear. In one embodiment, the ring is an integral mold of urethane foam with a heat-formed sealing skin and in another embodiment it may be integrated from mating molded plastic shells filled with such foam and subsequently welded or otherwise secured together.
Inventors
- 👤 R Grabhorn
- 👤 N Westcott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:07
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/38; B65D81/3813; B65D81/3823; B65D21/00; B65D21/02; B65D21/0209; B65D21/0224; Y; Y10; Y10S; Y10S206/00; Y10S206/821; Y10S220/00; Y10S220/902
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
42 words
A heat insulating device comprising a ring formed from heat insulating material and formed to provide a downwardly and inwardly inclined bevel surface about its lower exterior perimeter and a corresponding downwardly and inwardly inclined bevel surface about its upper interior perimeter.
Claim 2
Dependent Claim
42 words
A heat insulating device comprising a ring formed from heat insulating material and formed to provide a downwardly and inwardly inclined bevel surface about its lower exterior perimeter and a corresponding downwardly and inwardly inclined bevel surface about its upper interior perimeter.
Claim 3
Dependent Claim
15 words
The device of claim 1 including a transverse wall of insulating material within said ring.
Claim 4
Dependent Claim
26 words
The device of claim 2 in which the upper surface of said transverse wall is disposed below the plane of the upper perimeter of said ring.
Claim 5
Dependent Claim
26 words
The device of claim 3 in which the lower surface of said transverse wall is disposed below the plane of the lower perimeter of said ring.
Claim 6
Dependent Claim
27 words
The device of claim 1 in which one of said perimeters is formed with a ventilating notch opening from the interior of said ring to its exterior.
Claim 7
Dependent Claim
30 words
The device of claim 1 in which said ring is formed to provide interior and exterior draft surfaces from a plane intermediate its upper and lower perimeters to said perimeters.
Claim 8
Dependent Claim
32 words
The device of claim 1 in which said ring is formed to provide interior and exterior draft surfaces from a plane substantially midway between its upper and lower perimeters to said perimeters.
Claim 9
Dependent Claim
23 words
The device of claim 1 in which said ring consists of a continuous wall of urethane foam with an enveloping substantially liquid-proof skin.
Claim 10
Dependent Claim
31 words
The device of claim 1 in which said ring consists of a mating pair of open-mouthed, continuous shells of self-sustaining, substantially liquid-proof plastic filled with urethane foam and sealed together mouth-to-mouth.
Claim 11
Dependent Claim
33 words
The device of claim 2 in which the interior of said ring is formed with a plurality of opposed pairs of recesses for the selective reception of opposite ends of said transverse wall.
Claim 12
Dependent Claim
42 words
For use with a tray having an upstanding, outwardly inclined perimetral lip, a device as defined in claim 1 in which said bevel about its lower exterior perimeter is proportioned and designed to conform to the interior surface of said tray lip.
Claim 13
Dependent Claim
76 words
A food service system comprising a plurality of serving trays, each tray having an upstanding, outwardly inclined perimetral lip, a plurality of heat insulating rings disposed respectively between and separating said trays, each said ring being formed from heat insulating material, and each said ring being formed at its lower perimeter, to engage the lip of the subjacent tray and, at its upper perimeter, to engage the outer surface of the lip of the superjacent tray.
Claim 14
Dependent Claim
76 words
A food service system comprising a plurality of serving trays, each tray having an upstanding, outwardly inclined perimetral lip, a plurality of heat insulating rings disposed respectively between and separating said trays, each said ring being formed from heat insulating material, and each said ring being formed at its lower perimeter, to engage the lip of the subjacent tray and, at its upper perimeter, to engage the outer surface of the lip of the superjacent tray.
References Cited (Backward Citations)
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US1901022A
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US2328543A
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |