US3658731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane foams and composition
Assignee: Wisconsin Alumni Research Foundation
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Filing: 1969-08-04
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Granted: 1972-04-25
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Expires: 1989-08-04
Abstract
Abstract A FOAMED POLYURETHANE PRODUCED BY REACTION IN DIMETHYLSULFOXIDE OF DRY WHEY AND A POLYISOCYANATE OR OF LACTOSE AND WHEY OR YEAST PROTEIN WITH POLYISOCYANATE, WITH OR WITHOUT THE ADDITION OF CATALYST.
Inventors
- 👤 Thomas Richardson
- 👤 Gerald O Hustad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:54
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/166; C08G18/168; C08G18/28; C08G18/30; C08G18/32; C08G18/3203; C08G18/3218; C08G18/40; C08G18/64; C08G18/6415; C08G18/6446; C08G2110/00; C08G2110/0016; C08G2110/0025; C08J2375/00; C08J2375/04
Claims Analysis
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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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |