Patent US4797523A successfully refreshed from Google Patents.
US4797523A
Expired / Lapsed
US
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Cover for an open container, whose content is to be heated in a microwave oven
Assignee: Melitta Werke Bentz and Sohn KG
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Filing: 1986-08-19
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Granted: 1989-01-10
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Expires: 2006-08-19
Abstract
Abstract A cellulose hydrate film, having ventilation holes, for use in covering otherwise open topped containers of various sizes and shapes, in which the contents are to be heated in a microwave oven.
Inventors
- 👤 Friederun Kohnen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:18
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B65D81/3453; B65D2205/00; B65D2205/02; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
36 words
A cover for an open container in which material therein is to be heated in a microwave oven, characterized in that the cover is made from a cellulose hydrate film including means defining ventilation holes therein.
Claim 2
Dependent Claim
36 words
A cover for an open container in which material therein is to be heated in a microwave oven, characterized in that the cover is made from a cellulose hydrate film including means defining ventilation holes therein.
Claim 3
Dependent Claim
13 words
A cover according to claim 1, wherein the cellulose hydrate film is transparent.
Claim 4
Dependent Claim
56 words
A cover as in claim 1 wherein the cover is dementioned so as to be larger than an upper peripheral opening defined by the walls of a container with which it is used whereby in use the cover is contact with at least a portion of the walls of the container with which it is used.
Claim 5
Dependent Claim
14 words
A cover as in claim 1 wherein the film thickness is about 20 μm.
Claim 6
Dependent Claim
18 words
A cover as in claim 1 wherein the hole means are spaced apart at about 25 mm intervals.
Claim 7
Dependent Claim
92 words
A process for covering the contents of an open container to be used in a microwave oven including the steps of moistening at least a portion of a cellulose hydrate film having a plurality of spaced apart ventilation holes therein, placing the film over the container opening so that the moistened portion is in contact with the container and so that the ventilation openings are positioned over the opening in the open container and pressing the film onto the opening rim, and onto the outer surface area of the adjacent container wall.
Claim 8
Dependent Claim
92 words
A process for covering the contents of an open container to be used in a microwave oven including the steps of moistening at least a portion of a cellulose hydrate film having a plurality of spaced apart ventilation holes therein, placing the film over the container opening so that the moistened portion is in contact with the container and so that the ventilation openings are positioned over the opening in the open container and pressing the film onto the opening rim, and onto the outer surface area of the adjacent container wall.
Claim 9
Dependent Claim
15 words
A cover as in claim 1, wherein the cellulose hydrate film is an uncoated film.
Claim 10
Dependent Claim
35 words
A cover for an open container in which material us to be heated in a microwave oven, characterized in that the cover consists essentially of a cellulose hydrate film including means defining ventilation holes therein.
Claim 11
Dependent Claim
35 words
A cover for an open container in which material us to be heated in a microwave oven, characterized in that the cover consists essentially of a cellulose hydrate film including means defining ventilation holes therein.
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Cited
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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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |