Patent US2576418A successfully refreshed from Google Patents.
US2576418A
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Lignin compounds and method for making same
Assignee: Marathon Corp
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Filing: 1948-12-06
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Granted: 1951-11-27
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Expires: 1968-12-06
Abstract
No abstract record available.
Inventors
- 👤 Salvesen Jorgen Richter
- 👤 Harmon Carlyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:36
CPC Classifications
C; C08; C08H; C08H6/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE PROCESS OF PRODUCING A LIGNIN COMPOUND BY CONTROLLED ALKALINE HYDROLYSIS COMPRISING THE STEPS OF PREPARING AN AQUEOUS MIXTURE CONTAINING SODIUM HYDROXIDE IN AMOUNT TO PROVIDE FREE CAUSTIC SODA IN THE FINAL COOKED LIQUOR AND SODIUM LIGNOSULFONATE SUBSTANTIALY FREE FROM CALCUIM AND MAGNESIUM IONS, AND HEATING AND MIXTURE UNDER PRESSURE AND AT A TEMPARATURE RANGE OF 200* TO 225* C. FOR A PERIOD OF 20 TO 120 MINUTES.
Claim 2
Dependent Claim
68 words
THE PROCESS OF PRODUCING A LIGNIN COMPOUND BY CONTROLLED ALKALINE HYDROLYSIS COMPRISING THE STEPS OF PREPARING AN AQUEOUS MIXTURE CONTAINING SODIUM HYDROXIDE IN AMOUNT TO PROVIDE FREE CAUSTIC SODA IN THE FINAL COOKED LIQUOR AND SODIUM LIGNOSULFONATE SUBSTANTIALY FREE FROM CALCUIM AND MAGNESIUM IONS, AND HEATING AND MIXTURE UNDER PRESSURE AND AT A TEMPARATURE RANGE OF 200* TO 225* C. FOR A PERIOD OF 20 TO 120 MINUTES.
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) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |