Patent US3580736A successfully refreshed from Google Patents.
US3580736A
Expired / Lapsed
US
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Paperboard impregnated with a petroleum wax-polyurethane blend
Assignee: Atlantic Richfield Co
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Filing: 1967-04-26
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Granted: 1971-05-25
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Expires: 1987-04-26
Abstract
Abstract PAPERBOARD IS IMPREGNATED WITH A COMPOSITION CONTAINING A MAJOR AMOUNT OF PETROLEUM WAX AND A MINOR AMOUNT OF A WAX-COMPATIBLE URETHANE WHICH IS PREPARED FROM AN EXCESS DIENE POLYMER. THE PREFERRED DIISOCYANATE IS TERMINATED DIENE POLYMER. THE PREFERRED DIISOCYANATE IS TOLYLENE DIISOCYANATE AND THE PREFERRED POLYBUTADIENE HAS AT LEAST TWO AVERAGE TERMINAL HYDROXYL GROUPS IN THE ALLYLIC POSITION. IMPREGNATION OF PAPERBOARD WITH THE COMPOSITION PROVIDES A PRODUCT HAVING SIGNIFICANTLY IMPROVED STRENGTH, RIGIDITY AND WATER RESISTANCE.
Inventors
- 👤 Hallard C Moyer
- 👤 Eugene M Fauber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:54
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/60; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; C08L; C08L75/00; C08L75/04; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/57
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |