US2742449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the hardening characteristics of phenolic resins
Assignee: Hoechst AG Werk Kalle Albert
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Filing: 1952-10-31
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Granted: 1956-04-17
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Expires: 1972-10-31
Abstract
No abstract record available.
Inventors
- 👤 Schlenker Felix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:27
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
A HARDENABLE RESIN PRODUCED BY THE CONDENSATION OF A PHENOL WITH FORMALDEHYDE, CONTAINING AS A HARDENING AGENT A METAL ORGANIC COMPOUND, THE SAME BEING A SALT OF A POLYVALENT METAL WITH A TAUTOMERIC-REACTING CARBONYL COMPOUND OF THE KETO-ENOL STRUCTURE HAVING THE FORMULA R1-CO-CH2-CO-R2 WHEREIN R1 IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL, ARYL AND ALKOXY RADICALS AND R2 IS SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL AND ALKOXY RADICALS.
References Cited (Backward Citations)
GB657551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |