US2862813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-chemical pulping process
Assignee: Process Evaluation and Development Corp
•
Filing: 1952-12-23
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Granted: 1958-12-02
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Expires: 1972-12-23
Abstract
No abstract record available.
Inventors
- 👤 Birdseye Clarence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:07
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/22; D21C3/24; D21B; D21B1/00; D21B1/04; D21B1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN A CONTINUOUS PROCESS OF PULPING VEGETABLE MATERIAL, THE STEPS OF WETTING PIECES OF THE RAW MATERIAL UNDER ATMOSPHERIC CONDITIONS WITH DIGESTANT SOLUTION, ADDING FURTHER SOLUTION TO THE WETTED PIECES AT MORE THAN ATMOSPHERIC PRESSURE, ADVANCING AND SIMULTANEOUSLY PARTIALLY COOKING THE MIXTURE THUS FORMED, THEN ADDING TO THE PARTIALLY COOKED MIXTURE ADDITIONAL PITH AND SHORT FINE FIBERS REQUIRING A LESSER DEGREE OF DIGESTION THUS BY-PASSING THE INITIAL STEPS OF THE PROCESS, SHREDDING THE MATERIAL
Claim 2
Dependent Claim
74 words
IN A CONTINUOUS PROCESS OF PULPING VEGETABLE MATERIAL, THE STEPS OF WETTING PIECES OF THE RAW MATERIAL UNDER ATMOSPHERIC CONDITIONS WITH DIGESTANT SOLUTION, ADDING FURTHER SOLUTION TO THE WETTED PIECES AT MORE THAN ATMOSPHERIC PRESSURE, ADVANCING AND SIMULTANEOUSLY PARTIALLY COOKING THE MIXTURE THUS FORMED, THEN ADDING TO THE PARTIALLY COOKED MIXTURE ADDITIONAL PITH AND SHORT FINE FIBERS REQUIRING A LESSER DEGREE OF DIGESTION THUS BY-PASSING THE INITIAL STEPS OF THE PROCESS, SHREDDING THE MATERIAL
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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) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |