Patent US4876427A successfully refreshed from Google Patents.
US4876427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking, double-layered microwave package
Assignee: WestRock Minnesota Corp
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Filing: 1988-03-25
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Granted: 1989-10-24
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Expires: 2008-03-25
Abstract
Abstract A package for holding and microwave cooking of food comprising two or more food holding units, each having the shape of a generally rectangular box with opposed, opens ends and comprising, a first panel having a microwave absorbing heating surface facing the interior of the package, a second panel located opposite, spaced from and substantially parallel to the first panel and having a microwave absorbing heating surface facing the interior of the package, and a pair of substantially parallel side wall panels of approximately equal height connecting the first panel and the second panel, each of the side wall panel having an opening between its ends, wherein each food holding unit has the same orientation as the others and is joined to at least one adjacent food holding unit at a weakened separation line that encircles the packages in a plane substantially perpendicular to the first and second panels.
Inventors
- 👤 Duane R. Mode
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:55
CPC Classifications
B; B65; B65D; B65D71/00; B65D71/06; B65D71/12; B65D71/14; B65D71/16; B65D71/22; B65D81/00; B65D81/34; B65D81/3446; B65D81/3461; B65D2571/00; B65D2571/00123; B65D2571/00129; B65D2571/00135; B65D2571/00154; B65D2571/00246; B65D2571/00253; B65D2571/00283; B65D2571/00648; B65D2571/00654; B65D2571/0066; B65D2571/00709; B65D2571/00716; B65D2571/00833; B65D2571/00864; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3463; B65D2581/3466; B65D2581/3471; B65D2581/3472; B65D2581/3486; B65D2581/3494; B65D75/00; B65D75/52; B65D75/527; Y; Y10; Y10S; Y10S99/00; Y10S99/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
150 words
A package for holding and microwave cooking of food comprising two or more food holding units, each having the shape of a generally rectangular box with opposed, open ends and comprising: (a) a first panel having a microwave absorbing heating surface facing the interior of said package; (b) a second panel located opposite, spaced from and substantially parallel to said first panel and having a microwave absorbing heating surface facing the interior of said package; and (c) a pair of substantially parallel side wall panels approximately equal height connecting said first panel and said second panel, each said side wall panel having an opening between its ends, wherein each food holding unit has the same orientation as the others and is joined to at least one adjacent food holding unit at a weakened separation line that encircles the package in a plane substantially perpendicular to said first and second panels.
Claim 2
Dependent Claim
150 words
A package for holding and microwave cooking of food comprising two or more food holding units, each having the shape of a generally rectangular box with opposed, open ends and comprising: (a) a first panel having a microwave absorbing heating surface facing the interior of said package; (b) a second panel located opposite, spaced from and substantially parallel to said first panel and having a microwave absorbing heating surface facing the interior of said package; and (c) a pair of substantially parallel side wall panels approximately equal height connecting said first panel and said second panel, each said side wall panel having an opening between its ends, wherein each food holding unit has the same orientation as the others and is joined to at least one adjacent food holding unit at a weakened separation line that encircles the package in a plane substantially perpendicular to said first and second panels.
Claim 3
Dependent Claim
45 words
The package as recited in claim 1 wherein at least one of said first and second panels has a further microwave absorbing heating surface parallel to but exterior to and slightly separated from the microwave absorbing heating surface that faces the interior of the package.
Claim 4
Dependent Claim
35 words
The package as recited in claim 2 wherein all panels are made of paperboard to which a thinly metallized plastic film is laminated with the metal layer being sandwiched between the paperboard and plastic film.
Claim 5
Dependent Claim
28 words
The package as recited in claim 3 wherein the at least one panel having a further microwave absorbing heating surface comprises a double layer of said laminated paperboard.
Claim 6
Dependent Claim
19 words
The package as recited in claim 4 wherein the side wall panels on opposite sides converge toward each other.
Claim 7
Dependent Claim
40 words
The package as recited in claim 1 wherein the plane of each weakened separation line intersects the first and second panels and the side wall panels that join them to define the boundary between one food holding unit and another.
Claim 8
Dependent Claim
153 words
A flat blank for forming a package having at least a first and a second food unit for holding and microwave cooking of food, each of said food units being configured and connected in the same manner and each comprising: a central panel of generally rectangular shape having opposed side edges; a pair of connection wall panels attached to said central panel at opposing side edges thereof, each said wall panel having an aperture between its ends; a generally rectangular inner panel joined to one of the opposing side edges of said central panel by one of said connection wall panels; and a generally rectangular outer panel joined to the other of the opposing side edges of said central panel by the other of said connection wall panels, said first and second food units being joined to each other along a weakened line extending perpendicular to the opposing edges of said central panel.
Claim 9
Dependent Claim
153 words
A flat blank for forming a package having at least a first and a second food unit for holding and microwave cooking of food, each of said food units being configured and connected in the same manner and each comprising: a central panel of generally rectangular shape having opposed side edges; a pair of connection wall panels attached to said central panel at opposing side edges thereof, each said wall panel having an aperture between its ends; a generally rectangular inner panel joined to one of the opposing side edges of said central panel by one of said connection wall panels; and a generally rectangular outer panel joined to the other of the opposing side edges of said central panel by the other of said connection wall panels, said first and second food units being joined to each other along a weakened line extending perpendicular to the opposing edges of said central panel.
Claim 10
Dependent Claim
45 words
The blank as recited in claim 7 wherein said outer panel has a pair of locking tabs attached to the corners of said outer panel that are opposite the edge at which the adjacent connection wall panel joins the outer panel to the central panel.
Claim 11
Dependent Claim
37 words
The blank as recited in claim 7 wherein the blank is made from a paperboard material to which a metallized plastic film is laminated, so that the metal layer is sandwiched between the paperboard and plastic film.
Claim 12
Dependent Claim
20 words
The blank as recited in claim 7 wherein the inner and outer panels are substantially the same size and shape.
Claim 13
Dependent Claim
31 words
The blank as recited in claim 7 wherein the aperture in each side wall encompasses a larger area than the area of the portions of said wall panel surrounding said aperture.
Claim 14
Dependent Claim
26 words
The blank as recited in claim 7 wherein the opposing side edges of said central panel are curved outwardly from the center of the central panel.
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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) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |