US3590112A
Expired / Lapsed
US
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Treatment of microporous elastomeric polyurethane
Assignee: BASF Corp
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Filing: 1968-12-02
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Granted: 1971-06-29
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Expires: 1988-12-02
Abstract
Abstract PROCESS FOR IMPROVING THE PROPERTIES OF WATER VAPOR PERMEABLE MICROPOROUS SHEET OF NON-FIBROUS THERMOPLASTIC ELASTOMERIC POLYURETHANE OF THICKNESS SUITABLE FOR USE AS A SUBSTITUTE FOR SHOE UPPER LEATHER. THE SHEET IS HEAT TREATED AT A TEMPERATURE BELOW ITS COLLAPSE TEMPERATURE SO THAT IT SHRINKS AT LEAST 5% IN AREA. D R A W I N G
Inventors
- 👤 Frank P Civardi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:57
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/26; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0847; C08G18/0852; C08G18/089; C08G18/10; C08G18/12; C08G18/16; C08G18/18; C08G18/28; C08G18/2805; C08G18/65; C08G18/66; C08G18/6603; C08G18/6607; C08G18/6611; C08G18/6633; C08G18/6637; C08G18/664; C08J9/28; D; D06; D06N; D06N3/00; D06N3/0002; D06N3/0015; D06N3/0025; D06N3/0027; D06N3/0031; D06N3/12; D06N3/14; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10S521/00; Y10S521/918
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |