Patent US3306812A successfully refreshed from Google Patents.
US3306812A
Expired / Lapsed
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Process of sizing shaped fibrous articles with powdered fatty acids of 18 to 24 c atoms
Assignee: National Research Council Canada
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Filing: 1964-02-10
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Granted: 1967-02-28
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Expires: 1984-02-10
Abstract
No abstract record available.
Inventors
- 👤 Gordon D Sinclair
- 👤 Henry R Sallans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:17
CPC Classifications
D; D21; D21J; D21J1/00; D21J1/16; D21J1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR SIZING RELATIVELY RIGID SHAPED FIBROUS ARTICLES SUCH AS HARDBOARDS, PREPARED FROM A SLURRY OF FIBROUS PULP STOCK COMPRISING MIXING INTO SAID SLURRY WHILE AT A PH OF FROM ABOUT 4 TO ABOUT 10, ABOUT 0.5 TO 2% BY WEIGHT OF THE TOTAL SOLIDS CONTENT OF THE SLURRY OF A SIZING AGENT CONSISTING OF A DRY POWDERED, FREE, SATURATED, LONG CHAIN FATTY ACID HAVING FROM 18 TO 24 STRAIGHT CHAIN CARBON ATOMS IN ITS MOLECULE, FORMING THE PULP INTO A SHAPED ARTICLE AND HOT PRESSING SAID SHAPED ARTICLE AT A TEMPERATURE SUFFICIENT TO CAUSE SAID FATTY ACID TO VAPORIZE WITHIN THE SHAPED ARTICLE.
Claim 2
Dependent Claim
105 words
A PROCESS FOR SIZING RELATIVELY RIGID SHAPED FIBROUS ARTICLES SUCH AS HARDBOARDS, PREPARED FROM A SLURRY OF FIBROUS PULP STOCK COMPRISING MIXING INTO SAID SLURRY WHILE AT A PH OF FROM ABOUT 4 TO ABOUT 10, ABOUT 0.5 TO 2% BY WEIGHT OF THE TOTAL SOLIDS CONTENT OF THE SLURRY OF A SIZING AGENT CONSISTING OF A DRY POWDERED, FREE, SATURATED, LONG CHAIN FATTY ACID HAVING FROM 18 TO 24 STRAIGHT CHAIN CARBON ATOMS IN ITS MOLECULE, FORMING THE PULP INTO A SHAPED ARTICLE AND HOT PRESSING SAID SHAPED ARTICLE AT A TEMPERATURE SUFFICIENT TO CAUSE SAID FATTY ACID TO VAPORIZE WITHIN THE SHAPED ARTICLE.
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) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |