US3639307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urethane foams with reduced smoke levels
Assignee: Bayer Corp
•
Filing: 1969-11-03
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Granted: 1972-02-01
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Expires: 1989-11-03
Abstract
Abstract THIS INVENTION RELATES TO FIRE RETARDANT POLYURETHANE FOAMS HAVING REDUCED SMOKE LEVELS. THE INVENTION COMPRISES INCORPORATION FUMARIC ACID INTO FIRE-RETARDANT FOAM FORMULATION.
Inventors
- 👤 Herman P Doerge
- 👤 Marco Wismer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:27
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0023; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3878; C08G18/67; C08G18/675; C08G18/6755; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/49; C08K5/51; C08K5/52; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/903; Y10S521/906
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |