US3637543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire resistant polyurethane foams from polyisocyanates polyols and carboxylic acid derivatives
Assignee: Standard Oil Co
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Filing: 1969-11-12
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Granted: 1972-01-25
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Expires: 1989-11-12
Abstract
Abstract NOVEL THERMALLY STABLE RESINS AND FOAMS ARE PREPARED BY REACTING WITHOUT THE ADDITION OF EXTERNAL HEAT OR PRESSURE A POLYFUNCTIONAL AROMATIC CARBOXYLIC ACID DERIVAITIVE COMPRISING A BENZENE NUCLEUS SUBSTITUTED BY MEMBERS SELECTED FROM THE GROUP CONSISTING OF ANHYDRIDE, CARBOXYL, OR ACYL HALIDE WITH A POLYARLPOLYISOCYANATE AND A POLYOL CONTAINING AT LEAST THREE HYDROXYL GROUPS. THE PRODUCTS OF THIS INVENTION ARE USEFUL FOR INSULATION OF WALLS, FOR FIRE-PROOFING BUILDINGS AND THE LIKE.
Inventors
- 👤 F Koenig
- 👤 S Kus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:45
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29C48/25; B29C48/30; B29C48/32; B29C48/88; B29C48/885; B29C48/90; B29C48/901; B29C48/911; B29C48/9115; B29C48/912; C08G18/08; C08G18/0804; C08G18/28; C08G18/30; C08G18/34; C08G18/65; C08G18/66; C08G18/6625; C08G18/8048; C08G73/00; C08G73/06; C08G73/10; C08G73/16; B29C48/355; C08G2110/00; C08G2110/0041; Y; Y10; Y10S; Y10S521/00; Y10S521/903
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |