US3640920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid low-density filled cellular polyurethanes
Assignee: Zeneca Inc
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Filing: 1969-05-21
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Granted: 1972-02-08
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Expires: 1989-05-21
Abstract
Abstract RIGID, LOW DENSITY POLYURETHANE FOAM COMPOSITIONS ARE PROVIDED WHICH HAVE EXCELLENT FREEZER STABILITY WHILE RETAINING THE INSULATIVE VALUE, COMPRESSION STRENGTH AND OTHER DESIRABLE PHYSICAL PROPERTIES CHRACTERISTIC OF RIGID POLYURETHANE FOAMS. THE POLYURETHANE FOAMS CONTAIN FROM ABOUT 0.05% TO ABOUT 0.5% BY WEIGHT OF A FINELY DIVIDED, SOLID, PARTICULATE, INSOLUBLE AND NON-REACTIVE ADDITIVE MATERIAL SUCH AS IS COMMONLY USED IN FOAMS AS FILLER MATERIAL.
Inventors
- 👤 Stanley Cear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:13
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08K; C08K3/00; C08K3/02; C08K3/04; C08K3/18; C08K3/20; C08K3/22; C08K7/00; C08K7/02; C08K7/04; C08K7/10; C08K7/12; C08L; C08L75/00; C08L75/04; C08L83/00; C08L83/04; C08J2375/00; Y; Y10; Y10S; Y10S206/00; Y10S206/819; Y10S220/00; Y10S220/902
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |