Patent US3121709A successfully refreshed from Google Patents.
US3121709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resinous reaction products derived from lignins
Assignee: Chemtan Co
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Filing: 1960-08-22
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Granted: 1964-02-18
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Expires: 1980-08-22
Abstract
No abstract record available.
Inventors
- 👤 Engelmann Lothar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:42
CPC Classifications
C; C08; C08H; C08H6/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE WATER-SOLUBLE REACTION PRODUCT OBTAINED BY INTERACTING IN AN ALKALINE WATER SOLUTION AN ALKALI LIGNIN WITH AN AMINO COMPOUND SELECTED FROM THE GROUP CONSISTING OF MELAMINE, GUANYLUREA, GUANIDINE, UREA AND DICYANDIAMIDE; FORMALDEHYDE, AND A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ALKALI SALTS OF NAPHTOL SULFONIC ACIDS AND ALKALI SALTS OF AMINO SULFONIC ACIDS OF THE BENZENE AND NAPTHALENE SERIES, AND HEATING THE AQUEOUS REACTION MIXTURE UNDER REFLUX.
Claim 2
Dependent Claim
68 words
THE WATER-SOLUBLE REACTION PRODUCT OBTAINED BY INTERACTING IN AN ALKALINE WATER SOLUTION AN ALKALI LIGNIN WITH AN AMINO COMPOUND SELECTED FROM THE GROUP CONSISTING OF MELAMINE, GUANYLUREA, GUANIDINE, UREA AND DICYANDIAMIDE; FORMALDEHYDE, AND A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ALKALI SALTS OF NAPHTOL SULFONIC ACIDS AND ALKALI SALTS OF AMINO SULFONIC ACIDS OF THE BENZENE AND NAPTHALENE SERIES, AND HEATING THE AQUEOUS REACTION MIXTURE UNDER REFLUX.
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) | 1967-02-17 | 1967-08-19 | 1968-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-17 | 1971-08-19 | 1972-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-17 | 1975-08-19 | 1976-02-18 | $7700.00 | Window Closed / Lapsed |