US3589592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam receptacle
Assignee: Dow Chemical Co
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Filing: 1967-03-01
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Granted: 1971-06-29
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Expires: 1987-03-01
Abstract
Abstract A foam receptacle, such as a disposable cup, having walls comprised of laminated plies of plastic foam sheet.
Inventors
- 👤 Ruben A Tigner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:59
CPC Classifications
B; B65; B65D; B65D1/00; B65D1/22; B65D1/26; B65D1/265; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249976; Y10T428/249977; Y10T428/249981
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
55 words
A receptacle thermoformed from a plurality of thermoplastic foam sheets, said thermoformed receptacle comprising bottom and sidewalLs integrally formed together from said plurality of thermoplastic foam sheets, said bottom and sidewalls comprising a laminate of at least two plies of thermoplastic foam, said plies securely bonded together at the adjacent interface surfaces of said plies.
Claim 2
Dependent Claim
55 words
A receptacle thermoformed from a plurality of thermoplastic foam sheets, said thermoformed receptacle comprising bottom and sidewalLs integrally formed together from said plurality of thermoplastic foam sheets, said bottom and sidewalls comprising a laminate of at least two plies of thermoplastic foam, said plies securely bonded together at the adjacent interface surfaces of said plies.
Claim 3
Dependent Claim
20 words
The receptacle of claim 1 wherein said plurality of thermoplastic foam sheets are securely bonded together with an adhesive composition.
Claim 4
Dependent Claim
18 words
The receptacle of claim 1 wherein at least one of said plies comprises an open cell foam material.
Claim 5
Dependent Claim
18 words
The receptacle of claim 1 wherein at least one of said plies comprises a closed cell foam material.
Claim 6
Dependent Claim
25 words
The receptacle of claim 1 wherein at least one of said plies comprises a pigmented foam material of different color than another of said plies.
Claim 7
Dependent Claim
21 words
The receptacle of claim 1 wherein one of said plies has a cell structure relatively finer than another of said plies.
Claim 8
Dependent Claim
20 words
The receptacle of claim 1 wherein one of said plies has a density relatively higher than another of said plies.
Claim 9
Dependent Claim
17 words
The receptacle of claim 1 wherein one of said plies is thinner than another of said plies.
Claim 10
Dependent Claim
15 words
The receptacle of claim 1 wherein at least one of said plies is polystyrene foam.
Claim 11
Dependent Claim
22 words
The receptacle of claim 1 wherein at least one of said plies is formed from foam sheet material having a low density.
Claim 12
Dependent Claim
27 words
The receptacle of claim 1 wherein said receptacle is thermoformed from multiple superimposed layers of thermoplastic foam sheet, said layers simultaneously thermoformed together to make said receptacle.
Claim 13
Dependent Claim
19 words
The receptacle of claim 11 wherein said foam sheets have a combined thickness of at least about 200 mils.
Claim 14
Dependent Claim
69 words
The receptacle of claim 11 comprising at least two plies of thermoplastic foam, one of said plies being thermoformed from thermoplastic foam sheet having an average cell diameter between about 0.1 to about 0.15 millimeters, another of said plies being thermoformed from thermoplastic foam sheet having an average cell diameter of between about 0.5 to about 1.0 millimeters, said thermoplastic foam sheets simultaneously thermoformed together to make said receptacles.
Claim 15
Dependent Claim
26 words
The receptacle of claim 1 wherein the average density of said thermoplastic foam sheets forming said plies is about 10 pounds per cubic foot or less.
Claim 16
Dependent Claim
16 words
The receptacle of claim 11 wherein said receptacle comprises a structurally firm thermoplastic foam of polystyrene.
Claim 17
Dependent Claim
15 words
The receptacle of claim 1 wherein said plies are securely bonded together by heat sealing.
Claim 18
Dependent Claim
19 words
The receptacle of claim 1 wherein said plurality of thermoplastic foam sheets are securely bonded together with a solvent.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |