US3002881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing the wet strength of cellulosic material and article formed thereby
Assignee: Teck Metals Ltd
•
Filing: 1956-11-09
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Granted: 1961-10-03
•
Expires: 1976-11-09
Abstract
No abstract record available.
Inventors
- 👤 Mcdonnell Basil
- 👤 Jackson Harry Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:33
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/22; D21H17/33; D21H17/46; D21H17/47; D21H17/49
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN A PROCESS FOR INCREASING THE WET STRENGTH PROPERTIES OF FIBROUS CELLULOSIC MATERIAL, THE IMPROVEMENT WHICH COMPRISES THE STEP OF TREATING SAID FIBROUS CELLULOSIC MATERIAL WITH A COMBINATION COMPOSED OF WATER SOLUBLE GUANIDINE-FORMALDEHYDE RESIN AND A HYDROCOLLOID, THE FORMALDEHYDE BEING PRESENT IN SAID RESIN IN THE RATIO OF AT LEAST ABOUT 2 MOLS PER MOL OF GUANIDINE, SAID RESIN BEING PROVIDED IN AMOUNT OF AT LEAST ABOUT 0.1% BY WEIGHT BASED ON THE DRY WEIGHT OF THE FIBROUS CELLULOSIC MATERIAL, AND SAID HYDROCOLLOID BEING PROVIDED IN AMOUNT OF AT LEAST ABOUT 0.02% BY WEIGHT BASED ON THE DRY WEIGHT OF THE FIBROUS CELLULOSIC MATERIAL.
Claim 2
Dependent Claim
104 words
IN A PROCESS FOR INCREASING THE WET STRENGTH PROPERTIES OF FIBROUS CELLULOSIC MATERIAL, THE IMPROVEMENT WHICH COMPRISES THE STEP OF TREATING SAID FIBROUS CELLULOSIC MATERIAL WITH A COMBINATION COMPOSED OF WATER SOLUBLE GUANIDINE-FORMALDEHYDE RESIN AND A HYDROCOLLOID, THE FORMALDEHYDE BEING PRESENT IN SAID RESIN IN THE RATIO OF AT LEAST ABOUT 2 MOLS PER MOL OF GUANIDINE, SAID RESIN BEING PROVIDED IN AMOUNT OF AT LEAST ABOUT 0.1% BY WEIGHT BASED ON THE DRY WEIGHT OF THE FIBROUS CELLULOSIC MATERIAL, AND SAID HYDROCOLLOID BEING PROVIDED IN AMOUNT OF AT LEAST ABOUT 0.02% BY WEIGHT BASED ON THE DRY WEIGHT OF THE FIBROUS CELLULOSIC MATERIAL.
References Cited (Backward Citations)
US2492702A
Cited
US2338602A
Cited
GB613622A
Cited
US2512672A
Cited
US2601671A
Cited
US2632700A
Cited
US2668808A
Cited
US2829119A
Cited
US2736749A
Cited
US2819246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |