Patent US3770481A successfully refreshed from Google Patents.
US3770481A
Expired / Lapsed
US
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Process for the production of a leather substitute
Assignee: Hutchinson Compagnie National du Cautchouc
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Filing: 1971-07-26
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Granted: 1973-11-06
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Expires: 1991-07-26
Abstract
Abstract Supple and resistant material especially suited to be used as a leather substitute is produced by process wherein a crosslinkable coating composition of a microporous product is spread on a water vapor-permeable sheet and the coated sheet is maintained in contact with a belt applicator moving at the same speed and in the same direction as the coated sheet, the time of contact being sufficient to maintain the composition of the coated sheet in compression for at least a part of the crosslinking period.
Inventors
- 👤 C Canat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:24
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; D06N3/0086; D06N3/0095; D06N7/00; D06N7/0005; D06N7/0028; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24438; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979; Y10T428/31504; Y10T428/31511; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
Process as claimed in claim 1, wherein the sheet has a permeability to water vapor of at least 40 g/m2/h and the composition is such as to result in a microporous product containing 40 to 90 percent of open cells, a 6 mm thick sample of which product has a residual deformation of 15 to 35 percent at 20* C for an elongation of 300 percent at a speed of 21 cm/min.
Claim 2
Dependent Claim
76 words
Leather substitute composite product produced by the process of claim 1, comprising a sheet coated with a microporous polyurethane layer, the sheet having a permeability to water vapor of at least 40 g/m2/h, and the layer containing 40 to 90 percent of open cells, a 6 mm thick sample of the layer alone having a residual deformation of 15 to 35 percent at 20* C for a 300 percent elongation at a speed of 21 cm/min.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |