US3689463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing liquid water-soluble urea-formaldehyde resins employing an aryl or alkyl sulfonic acid
Assignee: Individual
•
Filing: 1971-05-07
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Granted: 1972-09-05
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Expires: 1991-05-07
Abstract
Abstract A METHOD OF PRODUCING LIQUID WATER-SOLUBLE UREA-FORMALDEHYDE RESINS COMPRISING SUCCESSIVE CONDENSATION OF UREA AND FORMALDEHYDE IN AN ALKALINE, ACIDIC AND NEUTRAL MEDIA. AN ACIDIC MEDIUM IS CREATED BY INTRODUCING AROMATIC OR ALIPHATIC SULPHONIC ACIDS. CONCENTRATION IN THE NEUTRAL MEDIUM IS CARRIED OUT WITH THE ADDITION OF FORMALDEHYDE. SAID PROCESS CONDITIONS ENSURE THE PRODUCING OF RESINS FEATURING AN UNLIMITED WATER-SOLUBILITY IN ANY PROPORTIONS, SUCH UNLIMITED WATER-SOLUBILITY OF THE RESINS BEING COMBINED WITH STABILITY OF THE PROPERTY UNDER PROLONGED STORAGE.
Inventors
- 👤 Anatoly Abramovich Kruglikov
- 👤 Militina Alexeevna Nikolaeva
- 👤 Simon Borisovich Vilker
- 👤 Viktor Vasilievich Detkov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:45
CPC Classifications
C; C08; C08G; C08G16/00; C08G16/02; C08G16/0212; C08G16/0218; C08G16/0237
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |