US4528802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Food wrap sealer
Assignee: WISCO INDUSTRIES Inc A CORP OF WIS
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Filing: 1982-09-22
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Granted: 1985-07-16
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Expires: 2002-09-22
Abstract
Abstract A food sealing device for shrink-wrapping foods such as pizza includes a heat source surrounded by an inner shroud to create an updraft for heating the film. A second outer shroud is positioned around the inner shroud to prevent the film from contacting the hot inner shroud to prevent melting of the film against the inner shroud which might otherwise damage the film or the food item.
Inventors
- 👤 Ferdinand F. Salzmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:08
CPC Classifications
B; B65; B65B; B65B53/00; B65B53/02; B65B53/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
256 words
A sealing device for sealing a film of heat shrinkable plastic film over a pizza or other food item comprising an elevated horizontal support disc (34) to receive and support the food; a heat source (18) located underneath the support disc (34); an inner tubular cylindrical shroud (20) surrounding the heat source (18) and mounted beneath said support and arranged so that air may pass underneath and therethrough so that air heated by the heat source (18) generates an updraft of heated air through the inner shroud (20), said inner cylinder having a diameter not substantially larger than the horizontal dimension of the food item; and an outer tubular cylindrical shroud (36) positioned around the inner shroud (20), the diameter of the outer shroud (36) being slightly larger than that of the inner shroud (20) just sufficiently to create an air passage between them so that a food item with a horizontal dimension that is not substantially smaller than the diameter of the inner cylinder can be overlaid with a film wrap touching the outer surface of the outer cylindrical shroud so that the outer shroud stays cool so that the plastic film will not be melted when the film touches the outer shroud, the outer shroud (36) having its upper edge positioned above the upper edge of the inner shroud (20) so as to prevent any possible contact between the plastic film and the upper edge of the inner shroud (20) so that contact is prevented between a hot metal surface and the plastic film.
Claim 2
Dependent Claim
256 words
A sealing device for sealing a film of heat shrinkable plastic film over a pizza or other food item comprising an elevated horizontal support disc (34) to receive and support the food; a heat source (18) located underneath the support disc (34); an inner tubular cylindrical shroud (20) surrounding the heat source (18) and mounted beneath said support and arranged so that air may pass underneath and therethrough so that air heated by the heat source (18) generates an updraft of heated air through the inner shroud (20), said inner cylinder having a diameter not substantially larger than the horizontal dimension of the food item; and an outer tubular cylindrical shroud (36) positioned around the inner shroud (20), the diameter of the outer shroud (36) being slightly larger than that of the inner shroud (20) just sufficiently to create an air passage between them so that a food item with a horizontal dimension that is not substantially smaller than the diameter of the inner cylinder can be overlaid with a film wrap touching the outer surface of the outer cylindrical shroud so that the outer shroud stays cool so that the plastic film will not be melted when the film touches the outer shroud, the outer shroud (36) having its upper edge positioned above the upper edge of the inner shroud (20) so as to prevent any possible contact between the plastic film and the upper edge of the inner shroud (20) so that contact is prevented between a hot metal surface and the plastic film.
Claim 3
Dependent Claim
33 words
A sealing device as claimed in claim 1 wherein the outer shroud includes a plurality of inwardly extending support tabs (40) arranged to support the outer shroud on and around the inner shroud.
Claim 4
Dependent Claim
22 words
A sealing device as claimed in claim 2 wherein the support tabs (40) are formed by cut-out portions of the outer shroud.
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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |