Patent US3586648A successfully refreshed from Google Patents.
US3586648A
Expired / Lapsed
US
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Flexible and hydrophilic polyurethane foam and a method of making same
Assignee: Elekal
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Filing: 1968-11-12
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Granted: 1971-06-22
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Expires: 1988-11-12
Abstract
Abstract TO THE USUAL COMPOUNDS INVOLVED IN MAKING A FLEXIBLE OPEN-CELL POLYURETHANE FOAM BY THE SO-CALLED "ONE-SHOT" METHOD THERE ARE ADDED, FROM 5 TO 30% BY WEIGHT, IN RELATION TO THE AMOUNT OF POLYOL THAT IS USED, AT LEAST ONE WATER INSOLUBLE CARBOXYMETHYL CELLULOSE OR A WATER SOLUBLE CARBOXYMETHYL CELLULOSE SALT ABLE TO PRODUCE, BY CATION EXCHANGE DURING OR AFTER FORMATION OF THE FOAM, AN INSOLUBLE SALT, TO THEREBY PRODUCE A POLYURETHANE FOAM HAVING IMPROVED HYDROPHILIC PROPERTIES.
Inventors
- 👤 Joerg Sambeth
- 👤 Alexis Archipoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:08
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |