US3759785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength newsprint
Assignee: Price Co Ltd
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Filing: 1971-10-06
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Granted: 1973-09-18
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Expires: 1991-10-06
Abstract
Abstract HIGH STRENGTH NEWSPRINT IS MADE BY CALENDERING A NEWS PRINT PAPER WEB BETWEEN A SMOOTH HARD METALLIC SURFACE AND A FIRM RESILIENT SURFACE SO THAT THE THICKNESS OF THE PAPER UNDER THE APPLIED PRESSURE VARIES FROM POINT-TOPOINT IN APPROXIMATE PROPORTION TO THE CORRESPONDING POINT-TO-POINT BASIS WEIGHT OF THE PAPER. THE CALENDERING IS EFFECTED SO THAT SMOOTHING PRESSURE IS APPLIED BY PASSING THE WEB THROUGH AT LEAST TWO RESILIENT NIPS, EACH NIP COMPRISING A HARD ROLL AND AN OPPOSING RESILENT ROLL, SO THAT EACH SIDE OF SAID WEB CONTACTS A HARD ROLL AT LEAST ONCE. THE NEWSPRINT PAPER MAY HAVE AT LEAST 25% OF SUPERGROUND WOOD.
Inventors
- 👤 W Mihelich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:02
CPC Classifications
D; D21; D21G; D21G1/00
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |