Patent US2898237A successfully refreshed from Google Patents.
US2898237A
Expired / Lapsed
US
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Heat-sealable polyethylene terephthalate film and process
Assignee: EIDP Inc
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Filing: 1957-09-16
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Granted: 1959-08-04
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Expires: 1977-09-16
Abstract
No abstract record available.
Inventors
- 👤 Sapper David Ivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:23
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/048; C08J7/052; C08J2367/00; C08J2367/02; C08J2455/00; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2822; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A PROCESS FOR IMPROVING THE HEAT-SEALABILITY OF ORIENTED, HEAT-SET POLYETHYLENE TEREPHTHALATE FILM WHICH COMPRISES COATING AT LEAST ONE SURFACE OF SAID FILM WITH AN AQUEOUS DISPERSION COATING COMPOSITION COMPRISING (1) FROM 65% TO 99% BY WEIGHT, BASED ON THE TOTAL WEIGHT OF SOILDS IN THE COMPOSITION, OF PARTICLES OF AN INTERPOLYMER PREPARED BY POLYMERIZING A MIXTURE OF MONOMERS COMPRISING ESSENTIALLY FROM ABOUT 34% TO ABOUT 38% BY WEIGHT OF BUTADIENE-1,3, FROM ABOUT 29% TO ABOUT 39% OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF STYRENE AND ALPHA- AND NUCLEAR-SUBSTITUTED ALKYL AND CHLOROSTYRENES, AND FROM ABOUT 27% TO ABOUT 33% OF ACRYLONITILE, (2) FROM 0% TO 35% OF POLYVINYL CHLORIDE PARTICLES, (3) FROM 0% TO 35% OF AMMONIUM ROSINATE PARTICLES AND (4) FROM 0% TO 35% OF A WAX SELECTED FROM THE GROUP CONSISTING OF PARAFFIN AND MICROCRYSTALLINE WAXES, THE SUM OF CONSTITUENTS (1), (2), (3) AND (4) BEING 100%, AND THEREAFTER DRYING THE COATED FILM.
Claim 2
Dependent Claim
156 words
A PROCESS FOR IMPROVING THE HEAT-SEALABILITY OF ORIENTED, HEAT-SET POLYETHYLENE TEREPHTHALATE FILM WHICH COMPRISES COATING AT LEAST ONE SURFACE OF SAID FILM WITH AN AQUEOUS DISPERSION COATING COMPOSITION COMPRISING (1) FROM 65% TO 99% BY WEIGHT, BASED ON THE TOTAL WEIGHT OF SOILDS IN THE COMPOSITION, OF PARTICLES OF AN INTERPOLYMER PREPARED BY POLYMERIZING A MIXTURE OF MONOMERS COMPRISING ESSENTIALLY FROM ABOUT 34% TO ABOUT 38% BY WEIGHT OF BUTADIENE-1,3, FROM ABOUT 29% TO ABOUT 39% OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF STYRENE AND ALPHA- AND NUCLEAR-SUBSTITUTED ALKYL AND CHLOROSTYRENES, AND FROM ABOUT 27% TO ABOUT 33% OF ACRYLONITILE, (2) FROM 0% TO 35% OF POLYVINYL CHLORIDE PARTICLES, (3) FROM 0% TO 35% OF AMMONIUM ROSINATE PARTICLES AND (4) FROM 0% TO 35% OF A WAX SELECTED FROM THE GROUP CONSISTING OF PARAFFIN AND MICROCRYSTALLINE WAXES, THE SUM OF CONSTITUENTS (1), (2), (3) AND (4) BEING 100%, AND THEREAFTER DRYING THE COATED FILM.
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) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |