US3708442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing foam materials resistant to pressure and heat from mixtures of bituminous masses and phenolic resins
Assignee: Rain Carbon Germany GmbH
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Filing: 1970-05-05
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Granted: 1973-01-02
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Expires: 1990-05-05
Abstract
Abstract FOAM MATERIALS RESISTANT TO PRESSURE AND HEAT ARE PREPARED FROM MIXTURES OF BITUMINOUS MASSES AND PHENOLIC RESINS BY CONDENSATION OF A MIXTURE OF BITUMINOUS MASSES, PHENOLS AND HEXAMETHYLENETETRAMINE IN THE PRESENCE OF AN ALKALINE CATALYST AT A REACTION TEMPERATURE IN THE RANGE OF 140 TO 200* C. FOR ABOUT 4 HOURS AND FOAMING AND HARDENING THE RESULTING MIXTURE COSISTING OF BITUMINOUS MASSES AND PHENOL-FORMALDEHYDE RESIN BY INCORPORATING THEREIN HEXAMETHYLENE-TETRAMINE.
Inventors
- 👤 J Omran
- 👤 H Jozef
- 👤 J Turowski
- 👤 E Turowski
- 👤 H Franck
- 👤 W Metzendorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:12
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G8/00; C08G8/28; C08G8/38; C08J9/02; C08J2361/00; C08J2361/04; C08J2361/06; C08J2495/00
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |