US2947655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing wood pulp
Assignee: Bauer Brothers Co
•
Filing: 1955-04-21
•
Granted: 1960-08-02
•
Expires: 1975-04-21
Abstract
No abstract record available.
Inventors
- 👤 Lee E Eberhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:09
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/30; D21B1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
THE METHOD OF PRODUCING GROUNDWOOD PULP CONSISTING OF THE STEPS OF CHIPPING PULP WOOD, WASTE WOOD AND THE LIKE, WETTING AND SOAKING SAID CHIPS, SUBJECTING SAID SOAKED CHIPS TO ALTERNATE CONTINUOUS APPLICATION AND RELEASE OF MECHANICALLY APPLIED PRESSURE FOR A PREDETERMINED PERIOD TO EFFECT A HIGH DEGREE OF FIBERIZATION OF SAID CHIPS AND EXTRACT SUBSTANTIALLY ALL THE MOISTURE AND NATURAL WOOD FLUIDS THEREFROM IN A SINGLE PASS, INTRODUCING WATER TO SAID CHIPS UPON FINAL RELEASE OF PRESSURE, SUBJECTING SAID PRESSED CHIPS WITH WATER ADDED THERETO TO A FURTHER FIBERIZING ACTION IN A DISC MILL, DISCHARGING SAID FIBERIZED ACTION IN A DISC MILL, DISCHARGING MOVAL OF IMPURITIES, DIRT SPECKS AND THE LIKE, THE REJECTS FROM SAID CLEANER BEING DISCHARGED TO WASTE, SUBJECTING THE ACCEPTED PORTION OF SAID STOCK TO THE ACTION OF A ROTARY SCREEN FOR REMOVAL OF LONG SHIVES AND UNDEFIBERED CHIPS, THE STOCK REMOVED THEREFROM BEING RETURNED TO THE PRESSURE STAGE OF THE PROCESS FOR FURTHER PROCESSING, THE FINALLY ACCEPTED MATERIAL BEING ACCEPTABLE GROUNDWOOD PULP.
Claim 2
Independent Claim
166 words
THE METHOD OF PRODUCING GROUNDWOOD PULP CONSISTING OF THE STEPS OF CHIPPING PULP WOOD, WASTE WOOD AND THE LIKE, WETTING AND SOAKING SAID CHIPS, SUBJECTING SAID SOAKED CHIPS TO ALTERNATE CONTINUOUS APPLICATION AND RELEASE OF MECHANICALLY APPLIED PRESSURE FOR A PREDETERMINED PERIOD TO EFFECT A HIGH DEGREE OF FIBERIZATION OF SAID CHIPS AND EXTRACT SUBSTANTIALLY ALL THE MOISTURE AND NATURAL WOOD FLUIDS THEREFROM IN A SINGLE PASS, INTRODUCING WATER TO SAID CHIPS UPON FINAL RELEASE OF PRESSURE, SUBJECTING SAID PRESSED CHIPS WITH WATER ADDED THERETO TO A FURTHER FIBERIZING ACTION IN A DISC MILL, DISCHARGING SAID FIBERIZED ACTION IN A DISC MILL, DISCHARGING MOVAL OF IMPURITIES, DIRT SPECKS AND THE LIKE, THE REJECTS FROM SAID CLEANER BEING DISCHARGED TO WASTE, SUBJECTING THE ACCEPTED PORTION OF SAID STOCK TO THE ACTION OF A ROTARY SCREEN FOR REMOVAL OF LONG SHIVES AND UNDEFIBERED CHIPS, THE STOCK REMOVED THEREFROM BEING RETURNED TO THE PRESSURE STAGE OF THE PROCESS FOR FURTHER PROCESSING, THE FINALLY ACCEPTED MATERIAL BEING ACCEPTABLE GROUNDWOOD PULP.
References Cited (Backward Citations)
US223670A
Cited
US1505934A
Cited
US1850832A
Cited
US1865768A
Cited
US1843467A
Cited
US1936697A
Cited
US2030653A
Cited
US2029973A
Cited
US2425024A
Cited
US2708160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |