US3666542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of microporous structures
Assignee: Teijin Ltd
•
Filing: 1970-01-28
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Granted: 1972-05-30
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Expires: 1990-01-28
Abstract
Abstract PROCESS FOR PREPARING A MICROPOROUS STRUCTURE WHEREIN A DISPERSION OF A POLYURETHANE HAVING HYDROPHILIC POLYOXYETHYLENE SEGMENTS IN A SOLVENT PLUS WATER IS COATED ON A SUBSTRATE AND SELECTIVELY EVAPORATED.
Inventors
- 👤 Koji Kigane
- 👤 Nobuji Ishihara
- 👤 Atushi Kametaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/48; C08G18/4833; C08L; C08L75/00; C08L75/04; D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S428/00; Y10S428/904
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |