Patent US2051844A successfully refreshed from Google Patents.
Patent US2709696A successfully refreshed from Google Patents.
US2709696A
Expired / Lapsed
US
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Reaction of unsulfonated lignin, formaldehyde and secondary amines and product
Assignee: EIDP Inc
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Filing: 1950-06-23
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Granted: 1955-05-31
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Expires: 1970-06-23
Abstract
No abstract record available.
Inventors
- 👤 Wiest Emil Gabriel
- 👤 Balon Walter Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:31
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
WATER-SOLUBLE DERIVATIVES OF LIGNIN, BEING THE COMPOUNDS OBTAINED BY REACTING, AT A TEMPERATURE BETWEEN 50* AND 100* C., 1 MOLE OF LIGNIN WITH 1 TO 3 MOLES OF FORMALDEHYDE AND 1 TO 3 MOLES OF A SECONDARY AMINE SELECTED FROM THE GROUP CONSISTING OF THE LOWER ALIPHATIC SECONDARY AMINES, MORPHOLINE AND PIPERAZINE, SAID COMPOUNDS BEING SOLUBLE IN WATER AND FORMING A WATERSOLUBLE SALT WITH HYDROCHLORIC ACID.
Claim 2
Dependent Claim
66 words
WATER-SOLUBLE DERIVATIVES OF LIGNIN, BEING THE COMPOUNDS OBTAINED BY REACTING, AT A TEMPERATURE BETWEEN 50* AND 100* C., 1 MOLE OF LIGNIN WITH 1 TO 3 MOLES OF FORMALDEHYDE AND 1 TO 3 MOLES OF A SECONDARY AMINE SELECTED FROM THE GROUP CONSISTING OF THE LOWER ALIPHATIC SECONDARY AMINES, MORPHOLINE AND PIPERAZINE, SAID COMPOUNDS BEING SOLUBLE IN WATER AND FORMING A WATERSOLUBLE SALT WITH HYDROCHLORIC ACID.
References Cited (Backward Citations)
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Cited
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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) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |