US3721360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Readily openable foamed polymer container
Assignee: Phillips Petroleum Co
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Filing: 1970-03-02
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Granted: 1973-03-20
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Expires: 1990-03-02
Abstract
Abstract A container is constructed from a foamed polymer and closed by heat sealing. It is provided with a score line, cut, or notch, as by the sealing apparatus at the plate at which it is to be rendered openable by tearing, cutting, etc. In one embodiment a high density polyolefin, e.g., polyethylene, is foamed and formed into a container or bottle and, when filled, is heat sealed as by bringing together in a sealing head the walls of the container and simultaneously providing the score or tear line.
Inventors
- 👤 S Collie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:24
CPC Classifications
B; B65; B65D; B65D1/00; B65D1/02; B65D1/0223; B65D1/023; B65D1/0238; B65D2501/00; B65D2501/0009; B65D2501/0018; B65D2501/0036; B65D2501/0081; Y; Y10; Y10S; Y10S215/00; Y10S215/901; Y10S229/00; Y10S229/94
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A readily openable completely sealed foamed polymer container, adapted to contain a fluid, made entirely by foaming a high density polyolefin polymer, said container being marked with a line indentation along which the container is readily openable as by cutting or tearing, said indentation being formed during the sealing of said container by heat sealing and by the heat applied to said high density polyolefin polymer during said heat sealing.
Claim 2
Dependent Claim
70 words
A readily openable completely sealed foamed polymer container, adapted to contain a fluid, made entirely by foaming a high density polyolefin polymer, said container being marked with a line indentation along which the container is readily openable as by cutting or tearing, said indentation being formed during the sealing of said container by heat sealing and by the heat applied to said high density polyolefin polymer during said heat sealing.
Claim 3
Dependent Claim
13 words
A container according to claim 1 wherein the container is made from polyethylene.
Claim 4
Dependent Claim
14 words
A container according to claim 2 wherein the polyethylene is a high density polyethylene.
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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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |