Patent US3093808A successfully refreshed from Google Patents.
Patent US3795575A successfully refreshed from Google Patents.
US3795575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulosic sheet material and process for its preparation
Assignee: Shell USA Inc
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Filing: 1972-05-02
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Granted: 1974-03-05
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Expires: 1992-05-02
Abstract
Abstract A CELLULOSIC SHEET MATERIAL (PAPER) WHICH EXHIBITS IMPROVED WET STRENGTH COMPRISES ABOUT 5-75% BY WEIGHT POLYMER FIBERS OBTAINED BY FIBRILLATING A COLD-STRETCHED MULTILAYERED FILM COMPRISING TWO OR MORE LAYERS OF DIFFERENT POLYMER COMPOSITIONS AND 25-95% BY WEIGHT CELLULOSIC FIBERS. THE NOVEL CELLULOSIC SHEET MATERIAL IS MADE BY INCORPORATING THE POLYMER FIBERS INTO THE CELLULOSIC FIBERS THEN HEATING TO A TEMPERATURE ABOVE THE MELTING POINT OF THE LOWEST MELTING POLYMER BUT BELOW THE TEMPERATURE OF THE HIGHEST MELTING POLYMER. THIS CELLULOSIC SHEET MATERIAL IS USED IN THE PREPARATION OF PAPER ARTICLES.
Inventors
- 👤 L Gouw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:01
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/20
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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |