US3781231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Physically reinforced hydrophilic foam and method of preparing same
Assignee: 3M Co
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Filing: 1971-09-17
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Granted: 1973-12-25
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Expires: 1991-09-17
Abstract
Abstract RESILIENT, RELATIVELY DENSE, OPEN-CELLED, FILLED POLYOXYALKYLENE/POLYISOCYANATE FOAM COMPOSITIONS OF HIGH RESISTANCE TO BOTTOMING OUT WHICH ARE HIGHLY HYDROPHILIC AND DIMENSIONALLY STABLE WITH ABSORPTION OF WATER, AND A PROCESS FOR THE PREPARATION OF THESE COMPOSITIONS.
Inventors
- 👤 E Janssen
- 👤 R Kyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:24
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G2110/00; C08G2110/0008; C08G2110/0033; C08G2110/0041; C08G2110/0083; C08J2375/00; C08J2421/00; Y; Y10; Y10S; Y10S521/00; Y10S521/905
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |