Patent US3219518A successfully refreshed from Google Patents.
US3219518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction product of dialdehyde with starch ether in paper
Assignee: Hercules Powder Co
•
Filing: 1963-03-28
•
Granted: 1965-11-23
•
Expires: 1983-03-28
Abstract
No abstract record available.
Inventors
- 👤 Edwin J Barber
- 👤 Clarence E Maag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:48
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; D21H17/29
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
33 words
PAPER EXCELLENT FORMATION AND SUPERIOR DRY STRENGTH CONTAINING UNIFORMLY DISTRUBUTED AMONG THE PAPERMAKING FIBERS THEREOF THE REACTION PRODUCT OF A DIALDEHYDE AND A GELATINIZED CATIONIC-NONIONIC STARCH ETHER, SAID STARCH ETHER HAVING THE FORMULA:
Claim 2
Dependent Claim
33 words
PAPER EXCELLENT FORMATION AND SUPERIOR DRY STRENGTH CONTAINING UNIFORMLY DISTRUBUTED AMONG THE PAPERMAKING FIBERS THEREOF THE REACTION PRODUCT OF A DIALDEHYDE AND A GELATINIZED CATIONIC-NONIONIC STARCH ETHER, SAID STARCH ETHER HAVING THE FORMULA:
Claim 3
Dependent Claim
86 words
IN A METHOD OF MAKING PAPER COMPRISING FORMING AN AQUEOUS SLURRY OF A FIBROUS MATERIAL, APSSING 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, THE REACTION PRODUCT OF A DIALDEHYDE AND A GELATINIZED CATIONIC-NONIONIC STARCH ETHER, SAID STARCH ETHER HAVING THE FORMULA:
Claim 4
Dependent Claim
86 words
IN A METHOD OF MAKING PAPER COMPRISING FORMING AN AQUEOUS SLURRY OF A FIBROUS MATERIAL, APSSING 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, THE REACTION PRODUCT OF A DIALDEHYDE AND A GELATINIZED CATIONIC-NONIONIC STARCH ETHER, SAID STARCH ETHER HAVING THE FORMULA:
References Cited (Backward Citations)
US2867615A
Cited
US2549177A
Cited
US2698936A
Cited
US2879268A
Cited
US2935436A
Cited
US3101330A
Cited
US3069410A
Cited
US3087852A
Cited
US3070594A
Cited
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 |