Patent US3561994A successfully refreshed from Google Patents.
US3561994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making moisture resistant paperboard
Assignee: Westvaco Corp
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Filing: 1967-05-03
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Granted: 1971-02-09
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Expires: 1987-05-03
Abstract
Abstract IN A LIQUID CONTAINER FORMED OF POLYETHYLENE COATED PAPERBOARD, WICKING THROUGH EXPOSED RAW EDGES ON THE INTERIOR OF THE CARTON IS SUBSTANTIALLY REDUCED BY TREATING THE PAPERBOARD WITH SMALL QUNATITIES OF A MOISTURE RESISTANT MATERIAL, SUCH AS WAX, PRIOR TO THE APPLICATION OF THE POLYETHYLENE COATING. THE WAX IS APPLIED TO THE PAPERBOARD IN MOLTEN FORM IN THE RANGE OF APPROXIMATELY 1 TO 7 PERCENT BY WEIGHT OF THE UNCOATED PAPAERBOARD AND DRIVEN EVENLY AND UNIFORMLY THROUGHOUT THE BOARD BY THE SUBSEQUENT APPLICATION OF HEAT.
Inventors
- 👤 James P Dwyre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:10
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/02; B65D5/06; B65D5/067; B65D5/42; B65D5/56; B65D5/563
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |