Patent US3647618A successfully refreshed from Google Patents.
US3647618A
Expired / Lapsed
US
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Method and apparatus for improving formation uniformity of paper
Assignee: Fort James Corp
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Filing: 1969-08-18
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Granted: 1972-03-07
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Expires: 1989-08-18
Abstract
Abstract TO IMPROVE THE FORMATION PROPERTIES OF A NONWOVEN WEB OF CELLULOSIC FIBER, THE WEB IS DRIED TO A MOISTURE CONTENT OF BETWEEN 18-40% MOISUTRE AND ADVANCED THROUGH A PRESSURE NIP BETWEEN A PAIR OF OPPOSED ROLLS. THE ROLLS ARE EACH VERY SLIGHTLY RESILIENT BUT HAVE A HARD SURFACE OF BETWEEN 3 AND 10 P & J PLASTOMETER 1/8 " BALL). THE PRESSURE NIP COMPACTION ALSO CONTRIBUTES TO DENSIFICATION, IMPROVED SURFACE SMOOTHNESS AND IMPROVED UNIFORMITY OF FIBER DISTRIBUTION.
Inventors
- 👤 Sangho E Back
- 👤 Rueben A Marti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:56
CPC Classifications
D; D21; D21G; D21G1/00; D21G1/0073; D21G1/0093
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |