Patent US3639318A successfully refreshed from Google Patents.
US3639318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasticized polyvinyl chloride film
Assignee: Union Carbide Corp
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Filing: 1968-05-29
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Granted: 1972-02-01
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Expires: 1988-05-29
Abstract
Abstract A HIGHLY PLASTICIZED POLYVINYL CHLORIDE FILM IS BIAXIALLY ORIENTED O OBTAIN A FILM WHICH, AFTER SHRINKING, EXHIBITS RESIDUAL ELASTICITY AND IMPROVED STRESS CHARACTERISTICS THEREBY PROVIDING AN IMPROVED WRAPPING OR PACKAGING FILM FOR FOOD ITEMS, PARTICULARLY FOOD ITEMS THAT ARE SUBJECT TO FREQUENT CUSTOMER HANDLING. THE BIAXIALLY ORIENTED PLASTIC FILM OBTAINED IS UTILIZED AS A PACKAGING FILM FOR STORINGFOOD ITEMS AT REFRIGERATOR OR FREEZING TEMPERATURES, OR FOR COOKING THE PACKAGED FOOD ITEMS AT ELEVATED TEMPERATURES, FOLLOWED BY STORAGE AT REFRIGERATOR OR FREEZER TEMPERATURES.
Inventors
- 👤 Donatas Tijunelis
- 👤 Edward A Shiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:52
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0016
Claims Analysis
Total Claims: 0
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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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |