US2769710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the continuous treatment of vegetable fibers
Assignee: Cellulose Development Corp Ltd
•
Filing: 1954-01-12
•
Granted: 1956-11-06
•
Expires: 1974-01-12
Abstract
No abstract record available.
Inventors
- 👤 Goulding Edward
- 👤 John Dorothy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:23
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A METHOD OF CONTINUOUSLY DIGESTING VEGETABLE FIBROUS MATERIAL WITH A TREATING SOLUTION WHICH CONSISTS IN CAUSING THE VEGETABLE FIBERS MIXED WITH A SUITABLE REAGENT UNDER ELEVATED TEMPERATURE TO CONTINUOUSLY DESCEND UNDER GRAVITY THROUGH AN UPRIGHT TOWER THEREBY RENDERING THE IMPURITIES IN THE FIBERS SEPARABLE, CONTINUOUSLY AGITATING THE MIXTURE NEAR THE BOTTOM OF THE TOWER AT A PRESSURE WHICH IS AT LEAST EQUAL TO THE VAPOR PRESSURE OF THE TREATING LIQUID AT THE ELEVATED TEMPERATURE AND
Claim 2
Independent Claim
75 words
A METHOD OF CONTINUOUSLY DIGESTING VEGETABLE FIBROUS MATERIAL WITH A TREATING SOLUTION WHICH CONSISTS IN CAUSING THE VEGETABLE FIBERS MIXED WITH A SUITABLE REAGENT UNDER ELEVATED TEMPERATURE TO CONTINUOUSLY DESCEND UNDER GRAVITY THROUGH AN UPRIGHT TOWER THEREBY RENDERING THE IMPURITIES IN THE FIBERS SEPARABLE, CONTINUOUSLY AGITATING THE MIXTURE NEAR THE BOTTOM OF THE TOWER AT A PRESSURE WHICH IS AT LEAST EQUAL TO THE VAPOR PRESSURE OF THE TREATING LIQUID AT THE ELEVATED TEMPERATURE AND
References Cited (Backward Citations)
US2474862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |