Patent US3608032A successfully refreshed from Google Patents.
US3608032A
Expired / Lapsed
US
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Method for making a flexible container portion
Assignee: Phillips Petroleum Co
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Filing: 1969-03-27
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Granted: 1971-09-21
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Expires: 1989-03-27
Abstract
Abstract A method for forming an integral flexible closure for a container, said method comprising the steps of heating an upper cross-sectional portion of said container, stretching said heated portion to form a film, and permitting the stretched portion to cool.
Inventors
- 👤 Harold D Boultinghouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:06
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/22; B29C57/00; B65; B65D; B65D1/00; B65D1/40
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
The invention as recited in claim 1 wherein said thermoplastic material is polymers of 1 -olefins.
Claim 2
Dependent Claim
35 words
The invention as recited in claim 2 wherein said thermoplastic material is polyethylene and said step of heating said material increases the temperature of the intermediate transition portion of the container to about 240* F.
Claim 3
Dependent Claim
21 words
The invention as recited in claim 3 wherein said container prior to stretching has a thickness of at least 20 mils.
Claim 4
Dependent Claim
24 words
The invention as recited in claim 4 wherein said step of stretching said film is performed at a stretch ratio of at least 3:1.
Claim 5
Dependent Claim
23 words
The invention as recited in claim 1 wherein said body, lip, and intermediate portions prior to stretching are configurated with elliptical cross sections.
Claim 6
Dependent Claim
23 words
The invention as recited in claim 1 wherein said body, lip and intermediate portions prior to stretching are configurated with circular cross sections.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |