US3595732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and microporous product
Assignee: 3M Co
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Filing: 1967-06-28
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Granted: 1971-07-27
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Expires: 1987-06-28
Abstract
Abstract MICROPOROUS POLYMERIC SHEET MATERIALS AND LEATHER SUBSTITUTES FORMED FROM POLYURETHANE OR POLYURETHANE-UREA POLYMERS WHICH ARE CROSSLINKED BY MEANS OF URETHANE OR UREA LINKAGES, AND A METHOD OF FORMING SUCH MATERIALS WHICH INCLUDES MIXING THE ACTIVE COMPONENTS INCLUDING AN ORGANIC-POLYISOCYANATE, A POLYOL, USUALLY A POLYAMINE, AND CATALYST TOGETHER IN A SOLVENT, CARRYING OUT THE REACTION IN THE SOLVENT WITH AGITATION UNTIL A DISPERSION OF PARTICLES INSOLUBLE IN THE SOLVENT IS FORMED, FORMING THE DISPERSION INTO A LAYER AND COMPLETING THE REACTION BEFORE REMOVAL OF THE LIQUID VEHICLE, THUS FORMING A CROSSLINKED MICROPOROUS LAYER.
Inventors
- 👤 William C Tingerthal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:17
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; C08J2375/00; C08J2375/04; Y; Y02; Y02P; Y02P20/00; Y02P20/141; Y10; Y10S; Y10S264/00; Y10S264/07; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249954; Y10T428/249962; Y10T428/249964; Y10T428/249978
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |