US2619681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making cellulose boards
Assignee: Curtis Companies Inc
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Filing: 1951-05-05
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Granted: 1952-12-02
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Expires: 1971-05-05
Abstract
No abstract record available.
Inventors
- 👤 Merle W Baker
- 👤 Forrest F Beil
- 👤 Charles F Curtis
- 👤 Edward A Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:17
CPC Classifications
B; B27; B27N; B27N3/00; B27D; B27D1/00; B27D1/04; B27D1/06; Y; Y10; Y10S; Y10S264/00; Y10S264/65; Y10S425/00; Y10S425/20; Y10S425/201; Y10T; Y10T428/00; Y10T428/24; Y10T428/24777
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A METHOD OF PREPARING A CELLULOSIC BOARD WHICH COMPRISES PROVIDING A MIXTURE COMPRISING MECHANICALLY DISINTEGRATED WOOD AND A RESINFORMING BINDER IN AN AMOUNT RANGING FROM ABOUT 4% TO ABOUT 14% BY WEIGHT OF SAID MIXTURE, SAID MIXTURE HAVING A MOISTURE CONTENT RANGING FROM ABOUT 5% TO ABOUT 25%, SUBJECTING A LAYER OF SAID MIXTURE AT AN ELEVATED TEMPERATURE RANGING FROM ABOUT 280* TO 400* F. TO A PRESSURE RANGING FROM ABOUT 150 TO ABOUT 500 POUNDS PER SQUARE INCH FOR AT LEAST 31/2 BUT LESS THAN 10 MINUTES, SAID PRESSURE BEING CORRELATED WITHIN SAID RANGE WITH THE MOISTURE CONTENT OF SAID MIXTURE AS TABULATED:
Claim 2
Independent Claim
104 words
A METHOD OF PREPARING A CELLULOSIC BOARD WHICH COMPRISES PROVIDING A MIXTURE COMPRISING MECHANICALLY DISINTEGRATED WOOD AND A RESINFORMING BINDER IN AN AMOUNT RANGING FROM ABOUT 4% TO ABOUT 14% BY WEIGHT OF SAID MIXTURE, SAID MIXTURE HAVING A MOISTURE CONTENT RANGING FROM ABOUT 5% TO ABOUT 25%, SUBJECTING A LAYER OF SAID MIXTURE AT AN ELEVATED TEMPERATURE RANGING FROM ABOUT 280* TO 400* F. TO A PRESSURE RANGING FROM ABOUT 150 TO ABOUT 500 POUNDS PER SQUARE INCH FOR AT LEAST 31/2 BUT LESS THAN 10 MINUTES, SAID PRESSURE BEING CORRELATED WITHIN SAID RANGE WITH THE MOISTURE CONTENT OF SAID MIXTURE AS TABULATED:
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) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |