Patent US3741920A successfully refreshed from Google Patents.
US3741920A
Expired / Lapsed
US
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Manufacture of thermal shock resistant foams
Assignee: Dynamit Nobel AG
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Filing: 1972-02-28
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Granted: 1973-06-26
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Expires: 1992-02-28
Abstract
Abstract A PHENOLIC FOAM HAVING IMPROVED RESISTANCE TO FIRE, HEAT AND ABRUPT CHANGES IN TEMPERATURE IS PREPARED BY FOAMING AND HARDENING AN INTIMATE MIXTURE OF (A) A CONVENTIONAL FOAMABLE PHENOLIC RESOLE RESIN CNTAINING A BLOWING AGENT, A HARDENER AND A SURFACE ACTIVE AGENT, AND (B) IN THE RANGE OF 2 TO 20 WEIGHT PERCENT, BASED ON THE PHENOLIC-RESIN, OF A FLOWABLE HYDROXYALKYLATED PHENOL.
Inventors
- 👤 F Weissenfels
- 👤 H Juenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2361/00; C08J2361/04; C08J2361/06; C08J2471/00; Y; Y10; Y10S; Y10S260/00; Y10S260/24
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |