US3573234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible and hydrophilic polyurethane foam and method of making same
Assignee: Elekal
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Filing: 1968-04-24
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Granted: 1971-03-30
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Expires: 1988-04-24
Abstract
Abstract THE INVENTION CONSISTS IN ADDING TO THE USUAL COMPOUNDS INVOLVED IN MAKING A FLEXIBLE OPEN-CELL POLYURETHANE FOAM BY THE SO-CALLED "ONE-SHOT" METHOD, FROM 5 TO 20%, PREFERABLY 10 TO 15%, BY WEIGHT, IN RELATION TO THE AMOUNT OF POLYOL THAT IS USED, OF AT LEAST ONE ALKALINE SALT OF CARBOXYMETHYL HYDROXYETHYL CELLULOSE IN FINE POWDER FORM, THEREBY TO PRODUCE A POLYURETHANE FOAM HAVING IMPROVED HYDROPHILIC PROPERTIES. A FOAM PRODUCED IN THIS WAY MAY BE MODIFIED BY TREATING IT IS AN ADDITIONAL STEP WITH AN AQUEOUS SOLUTION OF A SALT OF A METAL HAVING A VALENCE OF AT LEAST 2, E.G., ALUMINUM.
Inventors
- 👤 Alexis Archipoff
- 👤 Jerome Dupuy
- 👤 Joerg Sambeth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:41
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/4081; C08G18/64; C08G18/6484; C08J2375/00; C08J2375/04; C08J2401/00; Y; Y10; Y10S; Y10S521/00; Y10S521/905
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |