US2697703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fractionation of lignocellulose materials
Assignee: Wood Conversion Co
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Filing: 1951-02-09
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Granted: 1954-12-21
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Expires: 1971-02-09
Abstract
No abstract record available.
Inventors
- 👤 Clark C Heritage
- 👤 William G Van Beckum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:34
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
THE PROCESS OF TREATING COMMINUTED LIGNOCELLULOSE RAW MATERIAL TO FORM A FIBROUS PRODUCT AND CHEMICAL PRODUCTS THEREFROM, WHICH COMPRISES THE STEPS OF SUBJECTING AT LEAST THE WATER-INSOLUBLE CONTENT OF THE LIGNOCELLULOSE MATERIAL TO THE ACTION OF AN AQUEOUS SOLUTION OF ALKALI-METAL HYPOCHLORITE, SEPARATING THE DISSOLVED CONTENT OF THE SOLUTION OF REACTION BETWEEN THE SAID LIGNOCELLULOSE MATERIAL AND SAID AQUEOUS SOLUTION OF ALKALI METAL HYPOCHLORITE FROM THE FIBROUS RESIDUE OF SAID LIGNOCELLULOSE MATERIAL, ADJUSTING THE PH AND INORGANIC SALT CONCENTRATION OF SAID SOLUTION TO CAUSE THE LIGNIN CONTENT TO PRECIPITATE, SEPARATING THE PRECIPITATED LIGNIN CONTENT AS AN INTERMEDIATE PRODUCT OR PRODUCTS AND TO LEAVE AS A LAST PRODUCT A SOLUTION CONTAINING OTHER ORGANICS INCLUDING POLYSACCHARIDES.
Claim 2
Dependent Claim
114 words
THE PROCESS OF TREATING COMMINUTED LIGNOCELLULOSE RAW MATERIAL TO FORM A FIBROUS PRODUCT AND CHEMICAL PRODUCTS THEREFROM, WHICH COMPRISES THE STEPS OF SUBJECTING AT LEAST THE WATER-INSOLUBLE CONTENT OF THE LIGNOCELLULOSE MATERIAL TO THE ACTION OF AN AQUEOUS SOLUTION OF ALKALI-METAL HYPOCHLORITE, SEPARATING THE DISSOLVED CONTENT OF THE SOLUTION OF REACTION BETWEEN THE SAID LIGNOCELLULOSE MATERIAL AND SAID AQUEOUS SOLUTION OF ALKALI METAL HYPOCHLORITE FROM THE FIBROUS RESIDUE OF SAID LIGNOCELLULOSE MATERIAL, ADJUSTING THE PH AND INORGANIC SALT CONCENTRATION OF SAID SOLUTION TO CAUSE THE LIGNIN CONTENT TO PRECIPITATE, SEPARATING THE PRECIPITATED LIGNIN CONTENT AS AN INTERMEDIATE PRODUCT OR PRODUCTS AND TO LEAVE AS A LAST PRODUCT A SOLUTION CONTAINING OTHER ORGANICS INCLUDING POLYSACCHARIDES.
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) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |