Patent US2662012A successfully refreshed from Google Patents.
US2662012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of straw cellulose
Assignee: Akzona Inc
•
Filing: 1950-03-22
•
Granted: 1953-12-08
•
Expires: 1970-03-22
Abstract
No abstract record available.
Inventors
- 👤 Teunissen Pieter Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:44
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/02; D21C3/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PROCESS FOR THE PREPARATION OF STRAW CELLULOSE SUITABLE FOR MANUFACTURING PAPER WHICH COMPRISES DIGESTING THE STRAW FOR A PERIOD OF TIME NOT MORE THAN ABOUT 3 HOURS AND NOT LESS THAN ABOUT 2 HOURS IN AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF SODIUM HYDROXIDE AND SODIUM SULPHIDE MAINTAINED IN A TEMPERATURE RANGE BETWEEN 115* C. AND 130* C. AND HAVING A TOTAL CONTENT OF ALKALINE AGENTS FROM 7% TO 9% BASED ON THE WEIGHT OF THE DRY STRAW, SAID ALKALINE AGENTS CONSISTING OF ABOUT 80% SODIUM HYDROXIDE AND ABOUT 20% SODIUM SULPHIDE, THE STRAW-LIQUID RATIO BEING ABOUT 1:2.
Claim 2
Dependent Claim
98 words
A PROCESS FOR THE PREPARATION OF STRAW CELLULOSE SUITABLE FOR MANUFACTURING PAPER WHICH COMPRISES DIGESTING THE STRAW FOR A PERIOD OF TIME NOT MORE THAN ABOUT 3 HOURS AND NOT LESS THAN ABOUT 2 HOURS IN AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF SODIUM HYDROXIDE AND SODIUM SULPHIDE MAINTAINED IN A TEMPERATURE RANGE BETWEEN 115* C. AND 130* C. AND HAVING A TOTAL CONTENT OF ALKALINE AGENTS FROM 7% TO 9% BASED ON THE WEIGHT OF THE DRY STRAW, SAID ALKALINE AGENTS CONSISTING OF ABOUT 80% SODIUM HYDROXIDE AND ABOUT 20% SODIUM SULPHIDE, THE STRAW-LIQUID RATIO BEING ABOUT 1:2.
References Cited (Backward Citations)
US296935A
Cited
AT40620B
Cited
DE313344C
Cited
US1692774A
Cited
US1634603A
Cited
US1626171A
Cited
US1816456A
Cited
US1920239A
Cited
US2049567A
Cited
US2099400A
Cited
US2161763A
Cited
US2482142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |