US3397101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving the heat sealing qualities of thermoplastic film oriented by stretching
Assignee: Tetra Pak AB
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Filing: 1963-07-22
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Granted: 1968-08-13
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Expires: 1983-07-22
Abstract
No abstract record available.
Inventors
- 👤 Rausing Gad Anders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:08
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/12; C08J5/121; B; B29; B29C; B29C48/00; B29C48/001; B29C48/0013; B29C48/0015; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C66/00; B29C66/70; B29C66/71; B29C66/712; B29C66/72; B29C66/723; B29C66/73; B29C66/737; B29C66/7371; B29C66/73711; B29C66/73715; B32; B32B; B32B27/00; B29C48/10; B29C66/80; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; C08J2323/00; C08J2323/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
THE METHOD OF MAKING A THERMOPLASTIC FILM SUITABLE FOR PACKAGEING AND LIKE PURPOSES BY LAMINATING A LAYER OF POLYPROPYLENE WITH A RELATIVELY THIN LAYER OF POLYETHYLENE WEHREIN THE POLYPROPYLENE LAYER HAS A HIGHER MELTING POINT THAT THE POLYENTHYLENE LAYE WHICH COMPRISES THE STEPS FO EXTRUDING A HOT LAYER OF THE POLYPROPYLENE MATERIAL ONTO A PREMANUFACTURED NONHEATED FILM OF THE POLYETHYLENE MATERIAL, THE SURFACE OF SAID FILM OF POLYEHTYLENE MATERIAL BEING HEATED TO SEALING TEMPERATRE WITH SAID EXTRUDED LAYER OF POLYPROPYLENE MATERIAL BY THE HEAT WITHIN THE LATTER, COOLING THE RESULTING LAMINATE AND THEREAFTER STRETCHING SAID LAMINATE IN THE COOLED STATE TO EFFECT ORIENTATION THEREOF AND TO SIMULTANEOUSLY REDUCE THE THICKNESS OF THE POLYETHYLENE LAYER.
Claim 2
Independent Claim
114 words
THE METHOD OF MAKING A THERMOPLASTIC FILM SUITABLE FOR PACKAGEING AND LIKE PURPOSES BY LAMINATING A LAYER OF POLYPROPYLENE WITH A RELATIVELY THIN LAYER OF POLYETHYLENE WEHREIN THE POLYPROPYLENE LAYER HAS A HIGHER MELTING POINT THAT THE POLYENTHYLENE LAYE WHICH COMPRISES THE STEPS FO EXTRUDING A HOT LAYER OF THE POLYPROPYLENE MATERIAL ONTO A PREMANUFACTURED NONHEATED FILM OF THE POLYETHYLENE MATERIAL, THE SURFACE OF SAID FILM OF POLYEHTYLENE MATERIAL BEING HEATED TO SEALING TEMPERATRE WITH SAID EXTRUDED LAYER OF POLYPROPYLENE MATERIAL BY THE HEAT WITHIN THE LATTER, COOLING THE RESULTING LAMINATE AND THEREAFTER STRETCHING SAID LAMINATE IN THE COOLED STATE TO EFFECT ORIENTATION THEREOF AND TO SIMULTANEOUSLY REDUCE THE THICKNESS OF THE POLYETHYLENE LAYER.
References Cited (Backward Citations)
US2753596A
Cited
US2932323A
Cited
US2956723A
Cited
US3187982A
Cited
US3262808A
Cited
US3184358A
Cited
US3265552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |