US2774749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of dicyandiamide-formaldehyde condensation products
Assignee: GAF Chemicals Corp
•
Filing: 1952-11-15
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Granted: 1956-12-18
•
Expires: 1972-11-15
Abstract
No abstract record available.
Inventors
- 👤 Lester N Stanley
- 👤 Alois C Baggenstoss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:51
CPC Classifications
C; C07; C07C; C07C279/00; C07C279/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
64 words
A PROCESS FOR CONDENSING PARAFORMALDEHYDE AMMONIUM CHLORIDE AND DICYANDIAMIDE COMPRISING MIXING SAID SUBSTANCES IN DRY FORM AND IN MOLAR PROPORTIONS RESPECTIVELY OF ABOUT 1-3:0.5-1:1 AND HEATING THE MIXTURE AT A TEMPERATURE OF ABOUT 70 TO 150* C. UNDER ANHYDROUS CONDITIONS FOR A SUFFICIENT TIME TO PRODUCE AN ACIDIC CONDENSATION PRODUCT WHICH, IN THE FORM OF ITS HYDROCHLORIDE, IS SOLUBLE IN DILUTE AQUEOUS ACID MEDIA.
References Cited (Backward Citations)
US1952941A
Cited
US2106938A
Cited
US2405863A
Cited
GB594791A
Cited
US2593911A
Cited
US2662868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |