US3676247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrugating paperboard
Assignee: Amcor Pty Ltd
•
Filing: 1970-01-19
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Granted: 1972-07-11
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Expires: 1990-01-19
Abstract
Abstract A METHOD OF CORRUGATING PAPERBOARD AT COLD (AMBIENT) OR INTERMEDIATE TEMPERATURES UP TO 320* F. BUT AT CONVENTIONAL SPEEDS OR HIGHER BY TREATING BOTH SIDES OF THE MEDIUM PRIOR TO CORRUGATION WITH A LUBRICANT SUCH AS A MIXTURE OF STEARATES AND PARAFFIN WAX SO THAT THE COEFFICIENT OF KINETIC FRICTION BETWEEN THE MEDIUM AND CORRUGATOR IS LESS THAN WOULD BE OBTAINED BY CONVENTIONAL HEAT AND STEAM PRETREATMENT.
Inventors
- 👤 Andrew W Morris
- 👤 Reginald J Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:52
CPC Classifications
B; B31; B31F; B31F1/00; B31F1/20; B31F1/24; B31F1/26; B31F1/28; B31F1/2804; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1016; Y10T156/1025
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |