US3219519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starch ethers in paper
Assignee: Hercules Powder Co
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Filing: 1963-03-28
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Granted: 1965-11-23
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Expires: 1983-03-28
Abstract
No abstract record available.
Inventors
- 👤 Edwin J Barber
- 👤 Jr Ralph H Earle
- 👤 George C Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:37
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; C; C08; C08B; C08B31/00; C08B31/08; C08B31/12; C08B31/125
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
26 words
PAPER OF EXCELLENT FORMATION AND SUPERIOR DRY STRENGTH CONTAINING UNIFORMLY DISTRIBUTED AMONG THE PAPERMAKING FIBERS THEREOF A CATIONIC-NONIONIC STARCH ETHER, SAID STARCH ETHER HAVING THE FORMULA:
Claim 2
Dependent Claim
26 words
PAPER OF EXCELLENT FORMATION AND SUPERIOR DRY STRENGTH CONTAINING UNIFORMLY DISTRIBUTED AMONG THE PAPERMAKING FIBERS THEREOF A CATIONIC-NONIONIC STARCH ETHER, SAID STARCH ETHER HAVING THE FORMULA:
Claim 3
Dependent Claim
78 words
IN A METHOD OF MAKING PAPER COMPRISING FORMING AN AQUEOUS SLURRY OF A FIBROUS MATERIAL, PASSING THE SLURRY ONTO A SCREEN AND THEREBY FORMING A SHEET OF THE FIBROUS MATERIAL AND CAUSING MOST OF THE WATER TO DRAIN THEREFROM, AND THEN PRESSING AND DRYING THE SHEET TO OBTAIN THE FINAL PAPER PRODUCT, THE IMPROVEMENT WHICH COMPRISES ADDING TO THE SLURRY, PRIOR TO PASSING THE SLURRY ONTO THE SCREEN, A CATIONIC-NONIONIC STARCH ETHER, SAID STARCH ETHER HAVING THE FORMULA:
Claim 4
Dependent Claim
78 words
IN A METHOD OF MAKING PAPER COMPRISING FORMING AN AQUEOUS SLURRY OF A FIBROUS MATERIAL, PASSING THE SLURRY ONTO A SCREEN AND THEREBY FORMING A SHEET OF THE FIBROUS MATERIAL AND CAUSING MOST OF THE WATER TO DRAIN THEREFROM, AND THEN PRESSING AND DRYING THE SHEET TO OBTAIN THE FINAL PAPER PRODUCT, THE IMPROVEMENT WHICH COMPRISES ADDING TO THE SLURRY, PRIOR TO PASSING THE SLURRY ONTO THE SCREEN, A CATIONIC-NONIONIC STARCH ETHER, SAID STARCH ETHER HAVING THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |