US2884058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose web of improved dry strength containing a polymer comprising carboxylic groups, amide groups, and quaternary ammonium groups and method for producing same
Assignee: Wyeth Holdings LLC
•
Filing: 1955-05-02
•
Granted: 1959-04-28
•
Expires: 1975-05-02
Abstract
No abstract record available.
Inventors
- 👤 Walter H Schuller
- 👤 Walter M Thomas
- 👤 Sewell T Moore
- 👤 Ronald R House
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:27
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A METHOD OF MANUFACTURING A CELLULOSIC WEB OF IMPROVED DRY STRENGTH, WHICH COMPRISES: FORMING AN AQUEOUS SUSPENSION OF CELLULOSIC FIBERS, ADSORBING ON SAID FIBERS WHILE IN SAID SUSPENSION FROM ABOUT 0.05% TO 10% (BASED ON THEIR DRY WEIGHT) OF WATER-SOLUBLE LINEAR CARBON CHAIN POLYMER CONTAINING CARBOXYLIC GROUPS, AMIDE GROUPS, AND QUATERNARY AMMONIUM GROUPS; THE RATIO OF THE NUMBER OF QUATERNARY AMMONIUM GROUPS TO THE TOTAL NUMBER OF CARBOXYLIC GROUPS AND AMIDE GROUPS BEING BETWEEN ABOUT 0.1:99.9 AND 20:80, THE RATIO OF THE NUMBER OF CARBOXYLIC GROUPS TO THE NUMBER OF AMIDE GROUPS BEING BETWEEN ABOUT 0.1:99.9 AND 25:75, SHEETING SAID SUSPENSION TO FORM A WATERLAID WEB, AND DRYING SAID WEB.
Claim 2
Independent Claim
110 words
A METHOD OF MANUFACTURING A CELLULOSIC WEB OF IMPROVED DRY STRENGTH, WHICH COMPRISES: FORMING AN AQUEOUS SUSPENSION OF CELLULOSIC FIBERS, ADSORBING ON SAID FIBERS WHILE IN SAID SUSPENSION FROM ABOUT 0.05% TO 10% (BASED ON THEIR DRY WEIGHT) OF WATER-SOLUBLE LINEAR CARBON CHAIN POLYMER CONTAINING CARBOXYLIC GROUPS, AMIDE GROUPS, AND QUATERNARY AMMONIUM GROUPS; THE RATIO OF THE NUMBER OF QUATERNARY AMMONIUM GROUPS TO THE TOTAL NUMBER OF CARBOXYLIC GROUPS AND AMIDE GROUPS BEING BETWEEN ABOUT 0.1:99.9 AND 20:80, THE RATIO OF THE NUMBER OF CARBOXYLIC GROUPS TO THE NUMBER OF AMIDE GROUPS BEING BETWEEN ABOUT 0.1:99.9 AND 25:75, SHEETING SAID SUSPENSION TO FORM A WATERLAID WEB, AND DRYING SAID WEB.
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) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |