US4261504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sealable, ovenable containers
Assignee: SWEETHART CUP COMPANY Inc
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Filing: 1979-09-21
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Granted: 1981-04-14
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Expires: 1999-09-21
Abstract
Abstract A heat-sealable, ovenable container and method of manufacture wherein one of the components of the container, for example, the tray, is provided with a thermoplastic polyester coating and the other component, for example, the lid, is provided with a thermosetting polyester coating, said coatings cooperating to produce a self-venting, easy-tear, sanitary seal.
Inventors
- 👤 David A. Cowan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:47
CPC Classifications
B; B65; B65D; B65D43/00; B65D43/02; B65D51/00; B65D51/16; B65D51/1633; B65D51/1661; B65D51/1666; B65D81/00; B65D81/34; B65D81/343; B65D2205/00; B65D2543/00; B65D2543/00009; B65D2543/00018; B65D2543/00064; B65D2543/0012; B65D2543/00175; B65D2543/00194; B65D2543/00259; B65D2543/00296; B65D2543/00425; B65D2543/00444; B65D2543/00481; B65D2543/0049; B65D2543/00527; B65D2543/00537; B65D2543/00546; Y; Y10; Y10S; Y10S229/00; Y10S229/902; Y10S229/903
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
63 words
A heat-sealable container comprising a tray portion and a closure portion; one of said tray portion or said closure portion being provided with a thermoplastic polyester coating and the other of said container portion or said closure portion being provided with a cross-linked, thermosetting polyester-containing coating; said polyester coatings cooperating to produce an effective seal between said tray portion and said closure portion.
Claim 2
Dependent Claim
63 words
A heat-sealable container comprising a tray portion and a closure portion; one of said tray portion or said closure portion being provided with a thermoplastic polyester coating and the other of said container portion or said closure portion being provided with a cross-linked, thermosetting polyester-containing coating; said polyester coatings cooperating to produce an effective seal between said tray portion and said closure portion.
Claim 3
Dependent Claim
20 words
The heat-sealable container according to claim 1, wherein said coatings are provided on the inside surface of the assembled container.
Claim 4
Dependent Claim
17 words
The heat-sealable container according to claims 1 or 2, wherein the thermoplastic polyester coating is polyethylene terephthalate.
Claim 5
Dependent Claim
21 words
The heat-sealable container according to claims 1 or 2 wherein cross-linked, thermosetting polyester coating is a water-reducible, melamine modified, polyester copolymer.
Claim 6
Dependent Claim
20 words
The heat-sealable container according to claim 1, wherein the polyester coatings have a thickness of up to about 2 mils.
Claim 7
Dependent Claim
30 words
The heat-sealable container according to claim 1, wherein the thermoplastic polyester coating is disposed on the closure portion and the cross-linked, thermosetting polyester-containing coating is disposed on the tray portion.
Claim 8
Dependent Claim
30 words
The heat-sealable container according to claim 1, wherein the thermoplastic polyester coating is disposed on the tray portion and the cross-linked, thermosetting polyester-containing coating is disposed on the closure portion.
Claim 9
Dependent Claim
18 words
The heat-sealable container according to claim 1, wherein the tray portion and the closure portion are ovenable paperboard.
Claim 10
Dependent Claim
14 words
The heat sealable container according to claim 8, wherein the paperboard contains a fluoro-chemical.
Claim 11
Dependent Claim
16 words
The heat-sealable container according to claim 8, wherein the paperboard is provided with a fluoro-chemical coating.
Claim 12
Dependent Claim
10 words
The heat-sealable container of claim 1 containing a food product.
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) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |