Patent US1589456A successfully refreshed from Google Patents.
US3759848A
Expired / Lapsed
US
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Process for the production of pressure resistant highly heat resistant foam plastics made from mixtures of a bituminous mass and a novolak
Assignee: Rain Carbon Germany GmbH
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Filing: 1972-01-14
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Granted: 1973-09-18
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Expires: 1992-01-14
Abstract
Abstract AN IMPROVED PROCESS FOR THE PRODUCTION OF A PRESSURE RESISTANT AND HIGHLY HEAT RESISTANT FOAM PLASTIC BY SIMULTANEOUSLY FOAMING AND HARDENING A REACTION MIXTURE OF A BITUMINOUS MASS WITH A NOVOLAK, SAID FOAMING ACCOMPLISHED BY MEANS OF GAS LIBERATED DURING SAID HARDENING PROCESS OR BY MEANS OF AN ADDED EXPANDING AGENT, AND IMPROVEMENT COMPRISING SIMULTANEOUSLY FOAMING AND HARDENING A MIXTURE OF SAID BITUMINOUS MASS WITH A MODIFIED NOVOLAK COMPRISING THE REACTION PRODUCT OF A PHENOL, CARBAZOL AND FORMALEHYDE. THE FOAMED PLASTICS ARE USEFUL WHERE PRESSURE RESISTANCE AND HIGH HEAT RESISTANCE ARE REQUIRED.
Inventors
- 👤 J Omran
- 👤 H Franck
- 👤 M Zander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:06
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G14/00; C08G14/02; C08G14/04; C08G14/06; C08J2395/00; C08J2461/00
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |