Patent US4939096A successfully refreshed from Google Patents.
US2497073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction products of dicyandiamide with an amine-formaldehyde reaction product
Assignee: Wyeth Holdings LLC
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Filing: 1947-03-05
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Granted: 1950-02-14
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Expires: 1967-03-05
Abstract
No abstract record available.
Inventors
- 👤 James R Dudley
- 👤 John A Anthes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:53
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/043; C08G12/06; C08G12/08; C08G73/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
THE METHOD OF PREPARING A NEW SYNTHETIC COMPOSITION ESPECIALLY ADAPTED FOR USE AS A CATIONIC MODIFIER OF UREA-FORMALDEHYDE RESINS, SAID METHOD COMPRISING HEARING TOGETHER UNDER REFLUX (1) AN AQUEOUS SOLUTION OF FORMALDEHYDE AND (2) AN AQUEOUS SOLUTION OF N-METHYLANILINE HYDROCHLORIDE PRODUCED BY DISSOLVING N-METHYLANILINE IN CONCENTRATED HYDROCHLORIC ACID IN THE RATIO OF 1.1 MOLS OF HC1 PER MOL OF N-METHYLANILINE, THE FORMALDEHYDE OF (1) AND THE NMETHYLANILINE USED IN FORMING THE N-METHYLANILINE HYDROCHLORIDE OF (2) BEING EMPLOYED IN THE RATIO OF 0.75 MOL OF FORMALDEHYDE PER MOL OF NMETHYLANILINE, ADDING DICYANDIAMIDE TO THE RESULTING AQUEOUS SOLUTION OF THE N-METHYLANILINEFORMALDEHYDE REACTION PRODUCT IN AN AMOUNT CORRESPONDING TO 1.1 MOLS THEREOF PER MOL OF NMETHYLANILINE USED IN FORMING THE N-METHYLANILINE HYDROCHLORIDE, AND HEATING THE RESULTING AQUEOUS, ACIDIC REACTION MASS UNDER REFLUX TO EFFECT REACTION BETWEEN THE SAID DICYANDIAMIDE AND THE SAID N-METHYLANILINE-FORMALDEHYDE REACTION PRODUCT.
Claim 2
Independent Claim
142 words
THE METHOD OF PREPARING A NEW SYNTHETIC COMPOSITION ESPECIALLY ADAPTED FOR USE AS A CATIONIC MODIFIER OF UREA-FORMALDEHYDE RESINS, SAID METHOD COMPRISING HEARING TOGETHER UNDER REFLUX (1) AN AQUEOUS SOLUTION OF FORMALDEHYDE AND (2) AN AQUEOUS SOLUTION OF N-METHYLANILINE HYDROCHLORIDE PRODUCED BY DISSOLVING N-METHYLANILINE IN CONCENTRATED HYDROCHLORIC ACID IN THE RATIO OF 1.1 MOLS OF HC1 PER MOL OF N-METHYLANILINE, THE FORMALDEHYDE OF (1) AND THE NMETHYLANILINE USED IN FORMING THE N-METHYLANILINE HYDROCHLORIDE OF (2) BEING EMPLOYED IN THE RATIO OF 0.75 MOL OF FORMALDEHYDE PER MOL OF NMETHYLANILINE, ADDING DICYANDIAMIDE TO THE RESULTING AQUEOUS SOLUTION OF THE N-METHYLANILINEFORMALDEHYDE REACTION PRODUCT IN AN AMOUNT CORRESPONDING TO 1.1 MOLS THEREOF PER MOL OF NMETHYLANILINE USED IN FORMING THE N-METHYLANILINE HYDROCHLORIDE, AND HEATING THE RESULTING AQUEOUS, ACIDIC REACTION MASS UNDER REFLUX TO EFFECT REACTION BETWEEN THE SAID DICYANDIAMIDE AND THE SAID N-METHYLANILINE-FORMALDEHYDE REACTION PRODUCT.
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) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |