Patent US4022860A successfully refreshed from Google Patents.
US4022860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing arcuately curved film casings
Assignee: Kureha Corp
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Filing: 1975-01-13
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Granted: 1977-05-10
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Expires: 1995-01-13
Abstract
Abstract A method for producing arcuately curved film casings particularly suitable for a foodstuff such as meat or the like, by an inflation process, wherein a non-stretched resin tube is advanced along and in contact with a circumferential surface of a cylindrical shaping member at the time of inflation of the tube.
Inventors
- 👤 Katsuhiko Sugeno
- 👤 Toshimi Yamami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:32
CPC Classifications
A; A22; A22C; A22C13/00; A22C13/0003; B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29C48/915; B29C48/9155; B29C48/9175; B29C48/919; B29C53/00; B29C53/02; B29C53/08; B29C53/083; B29C53/10; A22C2013/0059; B29C48/001; B29C48/0019; B29C48/131; B29C48/90; B29C48/906; B29L; B29L2023/00; B29L2023/001; B29L2023/002
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
A method for producing an arcuately curved tubular film casing comprising the steps of: extruding a vinylidene chloride-based copolymer resin to form a non-crystalline, non-stretched resin tube; cooling the extruded resin tube immediately; advancing the resin tube along and in contact with a cylindrical shaping surface; longitudinally stretching said resin tube continuously while in contact with said shaping surface; inflating said resin tube continuously while advancing said tube in an arcuate path along and in contact with said cylindrical shaping surface, to produce circumferential stretching, said circumferential stretching occurring to a greater degree at the outer periphery than at the inner periphery to produce an arcuately curved form without application of heat; and removing said resin tube from said shaping surface under a tension less than that required to stretch the film.
Claim 2
Independent Claim
132 words
A method for producing an arcuately curved tubular film casing comprising the steps of: extruding a vinylidene chloride-based copolymer resin to form a non-crystalline, non-stretched resin tube; cooling the extruded resin tube immediately; advancing the resin tube along and in contact with a cylindrical shaping surface; longitudinally stretching said resin tube continuously while in contact with said shaping surface; inflating said resin tube continuously while advancing said tube in an arcuate path along and in contact with said cylindrical shaping surface, to produce circumferential stretching, said circumferential stretching occurring to a greater degree at the outer periphery than at the inner periphery to produce an arcuately curved form without application of heat; and removing said resin tube from said shaping surface under a tension less than that required to stretch the film.
Claim 3
Dependent Claim
37 words
A method as defined in claim 1, wherein said vinylidene chloride-based copolymer resin is a copolymer of 65 to 95 parts by weight of vinylidene chloride and 5 to 35 parts by weight of a copolymerizable monomer.
Claim 4
Dependent Claim
23 words
A method as defined in claim 1, wherein said shaping surface has a circular, semi-circular or horse shoe-like shape in a transverse section.
Claim 5
Dependent Claim
36 words
A method as defined in claim 1, wherein said shaping surface is formed of a plurality of bars or rolls which are arranged circularly in a transverse section so as to support the film under inflation.
Claim 6
Dependent Claim
29 words
A method as defined in claim 1, wherein said longitudinal and circumferential stretching are each within the range of 1.1 to 4.0 times the original length and circumference, respectively.
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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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |