US2844464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for chemically treating wood particles
Assignee: Individual
•
Filing: 1954-12-07
•
Granted: 1958-07-22
•
Expires: 1974-12-07
Abstract
No abstract record available.
Inventors
- 👤 Lawton Thomas Oregon
- 👤 Wilson Filmore Gilkeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:41
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/22; D21C3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A METHOD OF CHEMICALLY TREATING WOOD PARTICLES FOR THE PRODUCTION OF WOOD PULP COMPRISING INTRODUCING A CHEMICAL LIQUOR HAVING THE WOOD PARTICLES THEREIN INTO THE TOP OF ONE SIDE OF A LONG U-SHAPED VESSEL WHILE SUCH VESSEL IS SUBSTANTIALLY SUBMERGED WITHIN A LIQUID OF SUBSTANTIALLY THE SAME SPECIFIC GRAVITY AS THE CHEMICAL LIQUOR, AND ALLOWING THE LIQUOR TO FLOW OUT OF THE TOP OF THE OTHER SIDE OF THE U-SHAPED VESSEL WHILE THE CHEMICAL TREATMETN TAKES PLACE CONTINUOUSLY UNDER HIGH PRESSURE NEAR THE BOTTOM OF THE VESSEL.
Claim 2
Independent Claim
87 words
A METHOD OF CHEMICALLY TREATING WOOD PARTICLES FOR THE PRODUCTION OF WOOD PULP COMPRISING INTRODUCING A CHEMICAL LIQUOR HAVING THE WOOD PARTICLES THEREIN INTO THE TOP OF ONE SIDE OF A LONG U-SHAPED VESSEL WHILE SUCH VESSEL IS SUBSTANTIALLY SUBMERGED WITHIN A LIQUID OF SUBSTANTIALLY THE SAME SPECIFIC GRAVITY AS THE CHEMICAL LIQUOR, AND ALLOWING THE LIQUOR TO FLOW OUT OF THE TOP OF THE OTHER SIDE OF THE U-SHAPED VESSEL WHILE THE CHEMICAL TREATMETN TAKES PLACE CONTINUOUSLY UNDER HIGH PRESSURE NEAR THE BOTTOM OF THE VESSEL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |