Patent US3539549A successfully refreshed from Google Patents.
US3597307A
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US
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Supple sheet material and method of producing same
Assignee: Akzo NV
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Filing: 1969-01-27
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Granted: 1971-08-03
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Expires: 1989-01-27
Abstract
Abstract A SUPPLE SHEET MATERIAL SUITABLE AS A BASE MATERIAL FOR THE MANUFACTURE OF ARTIFICIAL LEATHER COMPRISING A NONWOVEN CONDENSED WEB FORMED FROM FIBERS OF SUBSTANTIALLY HYDROPHILIC MATERIAL, E.G., POLYVINYL ALCOHOL, AND A POLYMER FILLER WHICH HAS SUBSTANTIALLY NO ADHESION TO THE FIBERS, E.G., POLYURETHANE. THE FILLER IS HOMOGENEOUSLY DISTRIBUTED THROUGHOUT THE WEB AND COHERES AT SPACES BETWEEN THE FIBERS AND THE SHEET MATERIAL HAS A DENSITY OF AT LEAST 0.5 GRAM PER CUBIC CENTIMETER AT A TOTAL FILLER CONTENT OF NOT MORE THAN 30% BY WEIGHT, BASED ON THE WEIGHT OF THE SHEET MATERIAL. ALSO A METHOD FOR PRODUCING THIS SHEET MATERIAL IS DISCLOSED.
Inventors
- 👤 Pieter Paulusma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:22
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4382; D04H1/425; D04H1/4258; D04H1/4282; D04H1/4309; D04H1/44; D04H1/46; D04H1/48; D04H1/488; D04H1/50; D04H1/58; D04H1/587; D04H1/64; D04H1/645; D06; D06N; D06N3/00; D06N3/0002; D06N3/0015; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24364; Y10T428/24438
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |