Patent US3679418A successfully refreshed from Google Patents.
Patent US3684556A successfully refreshed from Google Patents.
US3684556A
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US
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Process for the production of a flexible synthetic,gas-permeable,multilayer sheet material having a napped outer surface
Assignee: Kalle GmbH and Co KG
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Filing: 1970-08-10
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Granted: 1972-08-15
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Expires: 1990-08-10
Abstract
Abstract THIS INVENTION RELATES TO A PROCESS FOR THE PRODUCTION OF A FLEXIBLE, GAS-PERMEABLE, MULTILAYER SHEET MATERIAL, AND TO THE MATERIAL SO PRODUCED, WHICH PROCESS COMPRISES APPLYING A LIQUID LAYER OF A SOLUTION CONTAINING UP TO 28 PERCENT BY WEIGHT OF POLYURETHANE IN AN ORGANIC SOLVENT MISCIBLE WITH WATER TO ONE SURFACE OF A FIBROUS SHEET MATERIAL, APPLYING A LIQUID PRECIPITATING AGENT TO THE LAYER AT A TEMPERATURE NOT IN EXCESS OF 5*C., WASHING THE RESULTING COAGULATED POLYMER LAYER, DRYING AND COOLING THE POLYMER LAYER, AND GRINDING THE OUTER SURFACE OF THE POLYMER LAYER.
Inventors
- 👤 Hans Mahl
- 👤 Heinrich Lind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:39
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; D06N3/007; D06N3/0075
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |