US2737504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction product of dicyandiamide, formaldehyde and alkali metal salt of a sulfonic acid
Assignee: Jacques Wolf & Co
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Filing: 1953-11-05
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Granted: 1956-03-06
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Expires: 1973-11-05
Abstract
No abstract record available.
Inventors
- 👤 William O Dawson
- 👤 Sellet Lucien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:56
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/40; C08G14/00; C08G14/02; C08G14/04; C08G14/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN MAKING A RESIN THAT IS SOLUBLE IN WATER AND PRECIPITABLE BY ALUMINUM SULFATE, THE PROCESS WHICH COMPRISES HEATING AN AQUEOUS SOLUTION OF DICYANDIAMIDE AND FORMALDEHYDE, TO FORM A CONDENSATE THEREOF, INTRODUING INTO THE SOLUTION A NON-ACIDIC WATER SOLUBLE, ANIONIC ALKALI METAL SALT OF A SULFONIC ACID IN PROPORTION TO DISSOLVE ANY PRECIPITATE THAT FORMS ON ADDING THE FIRST PORTIONS OF THE SALT, AND MAINTAINING THE SOLUTION THAT RESULTS IN HEATED CONDITION AT A PH ABOVE 7 UNTIL THE RESULTING MATERIAL BECOMES NON-PRECIPITABLE ON DILUTION WITH WATER BUT PRECIPTABLE BY ALUMINUM SULFATE, THE SULFONIC ACID REPRESENTED IN THE SAID SALT BEING SELECTED FROM THE GROUP CONSISTING OF AROMATIC SULFONIC ACIDS, SULFONATED ALCOHOLS, AND SULFITED LIGNIN.
Claim 2
Dependent Claim
115 words
IN MAKING A RESIN THAT IS SOLUBLE IN WATER AND PRECIPITABLE BY ALUMINUM SULFATE, THE PROCESS WHICH COMPRISES HEATING AN AQUEOUS SOLUTION OF DICYANDIAMIDE AND FORMALDEHYDE, TO FORM A CONDENSATE THEREOF, INTRODUING INTO THE SOLUTION A NON-ACIDIC WATER SOLUBLE, ANIONIC ALKALI METAL SALT OF A SULFONIC ACID IN PROPORTION TO DISSOLVE ANY PRECIPITATE THAT FORMS ON ADDING THE FIRST PORTIONS OF THE SALT, AND MAINTAINING THE SOLUTION THAT RESULTS IN HEATED CONDITION AT A PH ABOVE 7 UNTIL THE RESULTING MATERIAL BECOMES NON-PRECIPITABLE ON DILUTION WITH WATER BUT PRECIPTABLE BY ALUMINUM SULFATE, THE SULFONIC ACID REPRESENTED IN THE SAID SALT BEING SELECTED FROM THE GROUP CONSISTING OF AROMATIC SULFONIC ACIDS, SULFONATED ALCOHOLS, AND SULFITED LIGNIN.
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) | 1959-03-06 | 1959-09-05 | 1960-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-06 | 1963-09-05 | 1964-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-06 | 1967-09-05 | 1968-03-06 | $7700.00 | Window Closed / Lapsed |