US2694629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sized alkaline paper
Assignee: Wyeth Holdings LLC
•
Filing: 1951-04-18
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Granted: 1954-11-16
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Expires: 1971-04-18
Abstract
No abstract record available.
Inventors
- 👤 Jr Walter F Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:00
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/55
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
66 words
PAPER COMPOSED OF FELTED CELLULOSIC FIBERS SIZED BY AN OBSORBED CONTENT OF ABOUT 0.1% TO 5% OF THEIR DRY WEIGHT OF A WATER-SOLUBLE INITIAL CONDENSATION PRODUCT OF FROM 1 TO 2 MOLS OF EPICHLORHYDRIN WITH 1 MOL OF AN ALIPHATIC AMINE CONTAINING FROM 16 TO 22 CARBON ATOMS AND HEATED AT ABOUT 100-150* C. FOR ABOUT 0.5 TO 3 MINUTES TO DEVELOP THE SIZING PROPERTIES THEREOF.
References Cited (Backward Citations)
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Cited
US2040878A
Cited
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Cited
US2469683A
Cited
US2520093A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-15 | 1958-05-17 | 1958-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-15 | 1962-05-17 | 1962-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-15 | 1966-05-17 | 1966-11-16 | $7700.00 | Window Closed / Lapsed |