US2920983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic polyurethane foam structure and process
Assignee: EIDP Inc
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Filing: 1957-11-21
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Granted: 1960-01-12
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Expires: 1977-11-21
Abstract
No abstract record available.
Inventors
- 👤 Bugosh John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:51
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/905; Y10S521/918
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
39 words
THE PROCESS WHICH COMPRISES IMPREGNATING A POLYURETHANE FOAM STRUCTURE WITH AN AQUEOUS SOLUTION OF ALUMINUM SULFATE, SAID SOLUTION CONTAINING FROM 2% TO AND 4% OF ALUMINUM SULFATE, AND THEREAFTER DRYING SAID STRUCTURE AT A TEMPERATURE OF FROM 50*-120* C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |