US2730446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color improvement of unsized porous paper
Assignee: Wyeth Holdings LLC
•
Filing: 1952-03-15
•
Granted: 1956-01-10
•
Expires: 1972-03-15
Abstract
No abstract record available.
Inventors
- 👤 Hutchins Marsden Clair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:25
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/28; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/919
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
IN THE MANUFACTURE OF COLORED PAPER, A METHOD OF IMPROVING THE COLOR-RETENTION, WHICH COMPRISES MIXING WITH THE PULP SUSPENSION A PIGMENT AND A CATIONIC RESIN, PRIOR TO FORMING THE SHEET; THE AMOUNT OF SAID CATIONIC RESIN BEING NOT LESS THAN 1/8% AND NOT MORE THAN 10% OF THE PULP SOLIDS.
Claim 2
Dependent Claim
50 words
IN THE MANUFACTURE OF COLORED PAPER, A METHOD OF IMPROVING THE COLOR-RETENTION, WHICH COMPRISES MIXING WITH THE PULP SUSPENSION A PIGMENT AND A CATIONIC RESIN, PRIOR TO FORMING THE SHEET; THE AMOUNT OF SAID CATIONIC RESIN BEING NOT LESS THAN 1/8% AND NOT MORE THAN 10% OF THE PULP SOLIDS.
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) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |