US3598772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mineral filled polyurethane foams
Assignee: Hood Foam Industries Inc
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Filing: 1969-01-28
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Granted: 1971-08-10
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Expires: 1989-01-28
Abstract
Abstract POLYURETHANE FOAMS DERIVED FROM POLYESTERS OR POLYETHERS HAVE UNIFORMLY DISPERSED THEREIN FROM 75 TO 200% OF AN INERT MINERAL FILLER ON THE WEIGHT OF THE POLYURETHANE, INCLUDING ZIRCONIUM SILICATE AND SILICA. THE FILLERS HAVE DENSITIES BETWEEN 2 AND 5.5 GRAMS PER CUBIC CENTIMETER AND PARTICLES WHICH VARY IN AVERAGE SIZE FROM 120 TO 400 MICRONS IN DIAMETER AND ARE SUBSTANTIALLY SPHERICAL IN SHAPE, AND ARE ADMIXED WITH THE POLYURETHANE-FORMING MATERIAL PRIOR TO THE FOAMING REACTION. THE POLYURETHANEFORMING MATERIAL INCLUDES A LONG CHAIN POLYOL, AN ORGANIC POLYISOCYANATE, AND WATER IN AN AMOUNT BETWEEN 3 AND 4.5 PERCENT BY WEIGHT OF THE POLYOL USED.
Inventors
- 👤 Bruce G Hood
- 👤 Robert A Gardella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:48
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08K; C08K3/00; C08K3/34; C08K3/36; C08J2375/00
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |