Patent US2985643A successfully refreshed from Google Patents.
US2985643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for conversion of lignocellulose materials
Assignee: Wooduse Inc
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Filing: 1956-01-03
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Granted: 1961-05-23
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Expires: 1976-01-03
Abstract
No abstract record available.
Inventors
- 👤 Daryl R Boomer
- 👤 Edward T Clapperton
- 👤 Russell C Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:44
CPC Classifications
C; C08; C08H; C08H8/00; C05; C05F; C05F11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS FOR THE TREATMENT OF PARTICULATE LIGNOCELLULOSE MATERIALS, COMPRISING THE STEPS OF MIXING THE PARTICLES WITH A MIXTURE OF FROM ABOUT 20 TO ABOUT 80 PERCENT PHOSPHORIC ACID AND FROM ABOUT 80 TO ABOUT 20 PERCENT SULFURIC ACID, AND HEATING THE MIXTURE THUS FORMED AT A TEMPERATURE SUFFICIENTLY HIGH AND FOR A SUFFICIENT LENGTH OF TIME TO CHEMICALLY CONVERT AT LEAST A PORTION OF THE CELLULOSE IN SAID MIXTURE.
Claim 2
Dependent Claim
70 words
A PROCESS FOR THE TREATMENT OF PARTICULATE LIGNOCELLULOSE MATERIALS, COMPRISING THE STEPS OF MIXING THE PARTICLES WITH A MIXTURE OF FROM ABOUT 20 TO ABOUT 80 PERCENT PHOSPHORIC ACID AND FROM ABOUT 80 TO ABOUT 20 PERCENT SULFURIC ACID, AND HEATING THE MIXTURE THUS FORMED AT A TEMPERATURE SUFFICIENTLY HIGH AND FOR A SUFFICIENT LENGTH OF TIME TO CHEMICALLY CONVERT AT LEAST A PORTION OF THE CELLULOSE IN SAID MIXTURE.
References Cited (Backward Citations)
US2574027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |