US2686120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline pulping of lignocellulose in the presence of oxygen to produce pulp, vanillin, and other oxidation products of lignin substance
Assignee: Ontario Paper Co Ltd
•
Filing: 1952-01-14
•
Granted: 1954-08-10
•
Expires: 1972-01-14
Abstract
No abstract record available.
Inventors
- 👤 Marshall Harry Borden
- 👤 Sankey Charles Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:08
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/78; D; D21; D21C; D21C3/00; D21C3/02; D21C3/028
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PROCESS FOR SIMULTANEOUSLY PRODUCING FROM WOOD CHIPS A FIBROUS PULP AND A VANILLIN PRODUCT, WHICH PROCESS CONSISTS ESSENTIALLY OF DIGESTING SAID WOOD CHIPS IN AN ALKALINE PULPING LIQUOR AT A TEMPERATURE OF 150* C. TO 200* C. TO PRODUCE A PULP, CONTINUOUSLY PASSING INTO THE DIGESTION MIXTURE DURING THE PULPING STEP, A FINELY DISPERSED GAS CONTAINING FREE GASEOUS OXYGEN AND RECOVERING SAID VANILLIN PRODUCT, SAID ALKALINE PULPING LIQUOR CONTAINING AS THE SOLE ESSENTIAL COMPONENTS, WATER AND AN ALKALINE PULPING REAGENT SELECTED FROM THE GROUP CONSISTING OF SODIUM HY-
Claim 2
Dependent Claim
89 words
A PROCESS FOR SIMULTANEOUSLY PRODUCING FROM WOOD CHIPS A FIBROUS PULP AND A VANILLIN PRODUCT, WHICH PROCESS CONSISTS ESSENTIALLY OF DIGESTING SAID WOOD CHIPS IN AN ALKALINE PULPING LIQUOR AT A TEMPERATURE OF 150* C. TO 200* C. TO PRODUCE A PULP, CONTINUOUSLY PASSING INTO THE DIGESTION MIXTURE DURING THE PULPING STEP, A FINELY DISPERSED GAS CONTAINING FREE GASEOUS OXYGEN AND RECOVERING SAID VANILLIN PRODUCT, SAID ALKALINE PULPING LIQUOR CONTAINING AS THE SOLE ESSENTIAL COMPONENTS, WATER AND AN ALKALINE PULPING REAGENT SELECTED FROM THE GROUP CONSISTING OF SODIUM HY-
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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) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |