Patent US3050437A successfully refreshed from Google Patents.
US3050437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of sized paper
Assignee: Wyeth Holdings LLC
•
Filing: 1959-06-16
•
Granted: 1962-08-21
•
Expires: 1979-06-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Herbert G Arlt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:33
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07; D21H17/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A METHOD OF MANUFACTURING SIZED PAPER WHICH COMPRISES FORMING AN AQUEOUS SUSPENSION OF PAPERMAKING CELLULOSE FIBERS, ADDING THERETO AN EMULSION OF A HYDROPHOBIC ORGANIC ISOCYANATE, DEPOSITING AT LEAST PART OF SAID ISOCYANATE ON SAID FIBERS, SHEETING THE SUSPENSION TO FORM A WATERLAID WEB, AND DRYING SAID WEB AT A TEMPERATURE BETWEEN ABOUT 200*F.-250*F. WHEREBY SAID DEPOSITED ISOCYANATE CHEMICALLY REACTS WITH THE FIBERS.
Claim 2
Independent Claim
62 words
A METHOD OF MANUFACTURING SIZED PAPER WHICH COMPRISES FORMING AN AQUEOUS SUSPENSION OF PAPERMAKING CELLULOSE FIBERS, ADDING THERETO AN EMULSION OF A HYDROPHOBIC ORGANIC ISOCYANATE, DEPOSITING AT LEAST PART OF SAID ISOCYANATE ON SAID FIBERS, SHEETING THE SUSPENSION TO FORM A WATERLAID WEB, AND DRYING SAID WEB AT A TEMPERATURE BETWEEN ABOUT 200*F.-250*F. WHEREBY SAID DEPOSITED ISOCYANATE CHEMICALLY REACTS WITH THE FIBERS.
References Cited (Backward Citations)
US2284895A
Cited
US2303364A
Cited
FR1013946A
Cited
US2806190A
Cited
US2835652A
Cited
GB804504A
Cited
US2893898A
Cited
US2930106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |