US2721140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper of high wet strength and process therefor
Assignee: Hercules Powder Co
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Filing: 1952-09-19
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Granted: 1955-10-18
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Expires: 1972-09-19
Abstract
No abstract record available.
Inventors
- 👤 Cyrus A Weisgerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:48
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45; D21H17/455
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A HIGH WET-STRENGTH FELTED CELLULOSIC PRODUCT COMPRISING CELLULOSIC FIBERS HAVING INCORPORATED THEREWITH UP TO ABOUT 15% BASED ON THE WEIGHT OF THE FIBERS OF A POLYVINYLAMINE SELECTED FROM THE GROUP CONSISTING OF POLYVINYLAMINE AND POLYMERIC SOLVOLYTIC PRODUCTS OF N-VINYLIMIDES OF ORGANIC DICARBOXYLIC ACIDS, SAID POLYMERIC SOLVOLYTIC PRODUCTS HAVING AT LEAST 60% OF THEIR NITROGEN PRESENT AS PRIMARY AMINO GROUPS.
Claim 2
Dependent Claim
59 words
A HIGH WET-STRENGTH FELTED CELLULOSIC PRODUCT COMPRISING CELLULOSIC FIBERS HAVING INCORPORATED THEREWITH UP TO ABOUT 15% BASED ON THE WEIGHT OF THE FIBERS OF A POLYVINYLAMINE SELECTED FROM THE GROUP CONSISTING OF POLYVINYLAMINE AND POLYMERIC SOLVOLYTIC PRODUCTS OF N-VINYLIMIDES OF ORGANIC DICARBOXYLIC ACIDS, SAID POLYMERIC SOLVOLYTIC PRODUCTS HAVING AT LEAST 60% OF THEIR NITROGEN PRESENT AS PRIMARY AMINO GROUPS.
References Cited (Backward Citations)
US1160365A
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US2526125A
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US2394289A
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US2484423A
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US2631097A
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US2605253A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |