US3347952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of liquid heavy aromatic hydrocarbon-formaldehyde resins and their cured resins
Assignee: Mitsubishi Chemical Corp
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Filing: 1963-12-10
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Granted: 1967-10-17
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Expires: 1983-12-10
Abstract
No abstract record available.
Inventors
- 👤 Tanaka Sanae
- 👤 Yokoyama Katsura
- 👤 Seki Asao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:41
CPC Classifications
C; C08; C08L; C08L61/00; C08L61/18; C08G; C08G10/00; C08G10/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
A PROCESS FOR THE MANUFACTURE OF LIQUID HEAVY AROMATIC HYDROCARBON-FORMALDEHYDE RESINS COMPRISING REACTING HEAVY MONONUCLEAR AROMATIC HYDROCARBON HAVING AT LEAST EIGHT CARBON ATOMS WITH FORMALDEHYDE IN PRESENCE OF ACIDIC CATALYST AT A TEMPERATURE OF ABOUT 80*C. UNDER A PRESSURE OF 1 TO 100 ATMOSPHERIC PRESSURE, THE QUANTITY OF HYDROCARBON TO FORMALDEHYDE BEING A RATIO OF 1:1.11.4, THEN CONDENSING THE FORMED RESIN WITH AN AROMATIC HYDROCARBON HAVING ELECTRON DONATIVE GROUP IN PRESENCE OF ACIDIC CATALYST TO OBTAIN A MATERIAL HAVING A MELTING POINT OF 30*-200*C., AND THEREAFTER HEAT CURING UNDER ELEVATED PRESSURE THE MATERIAL IN THE PRESENCE OF HEXAMETHYLENETETRAMINE.
References Cited (Backward Citations)
US2066090A
Cited
US2200763A
Cited
US2954360A
Cited
US3178393A
Cited
US3119781A
Cited
US3231544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |