US3558330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging film and package
Assignee: Dow Chemical Co
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Filing: 1967-09-21
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Granted: 1971-01-26
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Expires: 1987-09-21
Abstract
Abstract A PACKAGING FILM PARTICULARLY SUITED FOR MACHINE OVERWRAPPING OF OXYGEN-SENSITIVE MATERIALS IS PREPARED BY SIMULTANEOUS EXTRUSION OF FILM HAVING AN INNER BARRIER LAYER SUCH AS A SARA RESIN COMPOSITION AND HAVING OUTER LAYERS OF MATERIALS OF WIDELY DIFFERING SEALING CHARACTERISTICS, AND A PACKAGE OF A COMESTIBLE AND THE FILM.
Inventors
- 👤 Almar T Widiger
- 👤 Lloyd E Lefever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:51
CPC Classifications
B; B32; B32B; B32B27/00
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |