Patent US2950268A successfully refreshed from Google Patents.
US2950268A
Expired / Lapsed
US
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Production of dicyandiamideformaldehyde reaction products
Assignee: GAF Chemicals Corp
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Filing: 1956-06-29
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Granted: 1960-08-23
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Expires: 1976-06-29
Abstract
No abstract record available.
Inventors
- 👤 Anthony J Cofrancesco
- 👤 Stiles M Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:44
CPC Classifications
C; C07; C07C; C07C279/00; C07C279/28; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/043; D; D06; D06P; D06P1/00; D06P1/44; D06P1/52; D06P1/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS COMPRISING FROM AN ACIDIC AQUEOUS SOLUTION HAVING A PH OF ABOUT 2.5-6.8 AND CONTAINING AS SUBSTANTIALLY THE SOLE REACTANTS FROM ABOUT 1 TO 3 MOLES OF FORMALDEHYDE, 0.5 TO 1 MOLE OF AN AMMONIUM SALT OF A STRONG ACID AND 1 MOLE OF DICYANDIAMIDE, AND MAINTAINING SAID SOLUTION AT A TEMPERATURE OF ABOUT 10* TO 45*C. UNTIL A WATER SOLUBLE REACTION PRODUCT IS OBTAINED.
Claim 2
Dependent Claim
66 words
A PROCESS COMPRISING FROM AN ACIDIC AQUEOUS SOLUTION HAVING A PH OF ABOUT 2.5-6.8 AND CONTAINING AS SUBSTANTIALLY THE SOLE REACTANTS FROM ABOUT 1 TO 3 MOLES OF FORMALDEHYDE, 0.5 TO 1 MOLE OF AN AMMONIUM SALT OF A STRONG ACID AND 1 MOLE OF DICYANDIAMIDE, AND MAINTAINING SAID SOLUTION AT A TEMPERATURE OF ABOUT 10* TO 45*C. UNTIL A WATER SOLUBLE REACTION PRODUCT IS OBTAINED.
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) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |