US3294624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleaching treated wood chips
Assignee: Associated Pulp and Paper Mills Ltd
•
Filing: 1963-01-21
•
Granted: 1966-12-27
•
Expires: 1983-01-21
Abstract
No abstract record available.
Inventors
- 👤 Sloman Arthur Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:08
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A METHOD OF BLEACHING WOOD CHIPS WHICH HAVE BEEN SUBJECTED TO A CHEMICAL COOKING TREATMENT AT SUPERATMOSPHERIC PRESSURE AND ELEVATED TEMPERATURE IN A FIRST PRESSURE VESSEL, WHICH COMPRISES PRE-FILLING A SECOND PRESSURE VESSEL WITH FLUID UNDER SUPERATMOSPHERIC PRESSURE, TRANSFERRING THE SAID CHIPS WHILE UNDER SUPERATMOSPHERIC PRESSURE FROM THE FIRST PRESSURE VESSEL TO SAID SECOND PRESSURE VESSEL, WHILE DISPLACING SAID FLUID FROM SAID SECOND PRESSURE VESSEL AS THE WOOD CHIPS ARE TRANSFERRED THERETO FROM THE FIRST PRESSURE VESSEL; REDUCING THE PRESSURE IN THE SECOND PRESSURE VESSEL TO ATMOSPHERIC PRESSURE, TRANSFERRING THE CHIPS BY GRAVITY FROM THE SECOND PRESSURE VESSEL TO THE UPPER END OF A BLEACHING VESSEL, CAUSING THE CHIP TO FLOW DOWNWARDLY IN THE BLEACHING VESSEL, AND CAUSING BLEACHING SOLUTION TO FLOW UPWARDLY IN THE BLEACHING VESSEL COUNTERCURRENT TO THE DOWNFLOW OF CHIPS, THE CHIPS BEING M IN TAINED IN SUBSTANTIALLY UNDEFIBRED FORM THROUGH THE SAID OPERATION.
Claim 2
Independent Claim
147 words
A METHOD OF BLEACHING WOOD CHIPS WHICH HAVE BEEN SUBJECTED TO A CHEMICAL COOKING TREATMENT AT SUPERATMOSPHERIC PRESSURE AND ELEVATED TEMPERATURE IN A FIRST PRESSURE VESSEL, WHICH COMPRISES PRE-FILLING A SECOND PRESSURE VESSEL WITH FLUID UNDER SUPERATMOSPHERIC PRESSURE, TRANSFERRING THE SAID CHIPS WHILE UNDER SUPERATMOSPHERIC PRESSURE FROM THE FIRST PRESSURE VESSEL TO SAID SECOND PRESSURE VESSEL, WHILE DISPLACING SAID FLUID FROM SAID SECOND PRESSURE VESSEL AS THE WOOD CHIPS ARE TRANSFERRED THERETO FROM THE FIRST PRESSURE VESSEL; REDUCING THE PRESSURE IN THE SECOND PRESSURE VESSEL TO ATMOSPHERIC PRESSURE, TRANSFERRING THE CHIPS BY GRAVITY FROM THE SECOND PRESSURE VESSEL TO THE UPPER END OF A BLEACHING VESSEL, CAUSING THE CHIP TO FLOW DOWNWARDLY IN THE BLEACHING VESSEL, AND CAUSING BLEACHING SOLUTION TO FLOW UPWARDLY IN THE BLEACHING VESSEL COUNTERCURRENT TO THE DOWNFLOW OF CHIPS, THE CHIPS BEING M IN TAINED IN SUBSTANTIALLY UNDEFIBRED FORM THROUGH THE SAID OPERATION.
References Cited (Backward Citations)
US1500378A
Cited
US1753228A
Cited
US1921966A
Cited
US2186034A
Cited
US2713540A
Cited
US2927007A
Cited
US2998307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |