US3330487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for loosening fibers of waste paper
Assignee: Individual
•
Filing: 1964-10-01
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Granted: 1967-07-11
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Expires: 1984-10-01
Abstract
No abstract record available.
Inventors
- 👤 Pav Jarmil
- 👤 Hnetkovsky Vaclav
- 👤 Drda Karel
- 👤 Libnar Zbynek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:04
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/30; D21B1/32; D21B1/303; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD OF LOOSENING FIBERS OF WASTE PAPER COMPRISING THE STEPS OF MIXING WASTE PAPER AND WATER AND SUBJECTING THE MIXTURE TO A COARSE PULPING OPERATION; THICKENING THE PULP THUS OBTAINED; FEEDING THE THICKENED PULP INTO A STORAGE TANK AND SUBJECTING IT THEREIN TO SWELLING AND HYDRATION; DISCHARGING SAID PULP FROM SAID TANK WHILE DILUTING IT TO A SMALLER DENSITY; SUBJECTING A STREAM OF THE DILUTED PULP TO MECHANICAL VIBRATIONS OF HIGH FREQUENCY FOR LOOSENING THE FIBERS; AND FINALLY SCREENING SAID PULP.
Claim 2
Independent Claim
82 words
A METHOD OF LOOSENING FIBERS OF WASTE PAPER COMPRISING THE STEPS OF MIXING WASTE PAPER AND WATER AND SUBJECTING THE MIXTURE TO A COARSE PULPING OPERATION; THICKENING THE PULP THUS OBTAINED; FEEDING THE THICKENED PULP INTO A STORAGE TANK AND SUBJECTING IT THEREIN TO SWELLING AND HYDRATION; DISCHARGING SAID PULP FROM SAID TANK WHILE DILUTING IT TO A SMALLER DENSITY; SUBJECTING A STREAM OF THE DILUTED PULP TO MECHANICAL VIBRATIONS OF HIGH FREQUENCY FOR LOOSENING THE FIBERS; AND FINALLY SCREENING SAID PULP.
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) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |