US3692706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed materials and their preparation
Assignee: Novartis AG
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Filing: 1971-01-18
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Granted: 1972-09-19
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Expires: 1991-01-18
Abstract
Abstract PHENOL-FORMALDEHYDE RESINS CONTAINING A BLOWING AGENT ARE FOAMED AND CURED WITHOUT THE APPLICATION OF EXTERNAL HEAT BY ADDING A LIQUID WHICH REACTS EXOTHERMICALLY TO FORM A POLYMER UNDER THE INFLUENCE OF THE CURING AGENT, A STRONG ACID. THUS, A FOAM IS PREPARED BY MIXING THE PHENOL-FORMALDEHYDE RESIN WITH A LIQUID, EXOTHERMICALLYREACTING SUBSTANCE, ESPECIALLY FURFURYL ALCOHOL, AND A BLOWING AGENT, AND THEN ADDING A STRONG ACID SUCH AS TOLUENEP-SULPHONIC ACID OR PHOSPHORIC ACID. OPTIONALLY, AN EMULSIFYING AGENT AND AN ACCELERATOR MAY BE INCORPORATED.
Inventors
- 👤 Graham Arthur Igglesden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:57
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/141; C08J9/06; C08J2361/00
Claims Analysis
Total Claims: 0
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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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |