Patent US1104012A successfully refreshed from Google Patents.
Patent US2845441A successfully refreshed from Google Patents.
US2845441A
Expired / Lapsed
US
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Processes for production of furfural
Assignee: Brown Co
•
Filing: 1955-11-16
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Granted: 1958-07-29
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Expires: 1975-11-16
Abstract
No abstract record available.
Inventors
- 👤 Morse Erwin Emerson
- 👤 Walter L Hearn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:30
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/38; C07D307/40; C07D307/46; C07D307/48; C07D307/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE PROCESS OF PRODUCING FURFURAL FROM ACIDIC HARDWOOD WASTE LIQUOR WHICH COMPRISES ESTABLISHING AND MAINTAINING A HYDROLYSIS-REACTION ZONE, CONDUCTING SAID LIQUOR TO SAID ZONE, MAINTAINING THE LIQUOR IN SAID ZONE AT A TEMPERATURE BETWEEN ABOUT 347*. AND 420*F. FOR A PERIOD BETWEEN ABOUT 10 AND 40 MINUTES AT AN OPERATING PRESSURE LYING BETWEEN SUBSTANTIALLY 114 AND 295 P.S.I.G., REMOVING EFFLUENT GAS AND SPENT LIQUOR FROM SAID ZONE AT PREDETERMINED AREAS THEREOF WHICH ARE REMOTE FROM EACH OTHER, AND THEREAFTER SEPARATING THE PRODUCT FURFURAL FROM THE EFFLUENT GAS.
Claim 2
Dependent Claim
87 words
THE PROCESS OF PRODUCING FURFURAL FROM ACIDIC HARDWOOD WASTE LIQUOR WHICH COMPRISES ESTABLISHING AND MAINTAINING A HYDROLYSIS-REACTION ZONE, CONDUCTING SAID LIQUOR TO SAID ZONE, MAINTAINING THE LIQUOR IN SAID ZONE AT A TEMPERATURE BETWEEN ABOUT 347*. AND 420*F. FOR A PERIOD BETWEEN ABOUT 10 AND 40 MINUTES AT AN OPERATING PRESSURE LYING BETWEEN SUBSTANTIALLY 114 AND 295 P.S.I.G., REMOVING EFFLUENT GAS AND SPENT LIQUOR FROM SAID ZONE AT PREDETERMINED AREAS THEREOF WHICH ARE REMOTE FROM EACH OTHER, AND THEREAFTER SEPARATING THE PRODUCT FURFURAL FROM THE EFFLUENT GAS.
References Cited (Backward Citations)
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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) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |