US2838397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of mineralfilled papers
Assignee: Rohm and Haas Co
•
Filing: 1956-04-10
•
Granted: 1958-06-10
•
Expires: 1976-04-10
Abstract
No abstract record available.
Inventors
- 👤 Irving J Gruntfest
- 👤 David B Fordyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:07
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/37; D21H17/41; D21H17/44; D21H17/45; D21H17/455
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR MAKING FILLED PAPERS AND THE LIKE WHICH COMPRISES DEPOSITING ON A FORAMINOUS FORMING SURFACE AN AQUEOUS SUSPENSION OF CELLULOSE FIBERS AND A WATER-INSOLUBLE INORGANIC FILLER, SAID SUSPENSION HAVING A PH BETWEEN ABOUT 3 AND 12 AND CONTAINING 0.01 TO 0.5% BY WEIGHT OF THE FIBERS AND CONTAINING DISSOLVED THEREIN ABOUT 0.01 TO 1% BY WEIGHT, BASED ON THE WEIGHT OF FIBER, OF A WATER-SOLUBLE HOMOPOLYMER OF 8(N,N-DIMETHYLAMINO)ETHYL METHACRYLATE QUATERNIZED BY ETHYLENE OXIDE, SAID HOMOPOLYMER HAVING A MOLECULAR WEIGHT OF SEVERAL MILLION.
Claim 2
Dependent Claim
84 words
A PROCESS FOR MAKING FILLED PAPERS AND THE LIKE WHICH COMPRISES DEPOSITING ON A FORAMINOUS FORMING SURFACE AN AQUEOUS SUSPENSION OF CELLULOSE FIBERS AND A WATER-INSOLUBLE INORGANIC FILLER, SAID SUSPENSION HAVING A PH BETWEEN ABOUT 3 AND 12 AND CONTAINING 0.01 TO 0.5% BY WEIGHT OF THE FIBERS AND CONTAINING DISSOLVED THEREIN ABOUT 0.01 TO 1% BY WEIGHT, BASED ON THE WEIGHT OF FIBER, OF A WATER-SOLUBLE HOMOPOLYMER OF 8(N,N-DIMETHYLAMINO)ETHYL METHACRYLATE QUATERNIZED BY ETHYLENE OXIDE, SAID HOMOPOLYMER HAVING A MOLECULAR WEIGHT OF SEVERAL MILLION.
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) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |