Method for the manufacture of latex bonded asbestos cover layers and covers produced
Abstract
Abstract A PROCESS FOR THE PRODUCTION OF LATEX BONDED COVER LAYERS FOR ELECTROCHEMICAL CELLS, PARTICULARLY FUEL CELLS, IS DESCRIBED. AMPHIBOLE ASBESTOS, PARTICULARLY ANTHOPHYLLITE ASBESTOS, BUNDLES ARE BROKEN DOWN BY A CATIONIC WETTING AGENT. THE NONBROKEN-DOWN PARTICLES ARE REMOVED. A SUSPENSION IS MADE FROM THE ASBESTOS FIBERS AND FILLER SUBSTACES IN THE FORM OF POWDERS, WITH A GRAIN SIZE OF UP TO 100U, WHICH ARE STABLE IN ACID ELECTROLYTE, HAVE IONIC CONDUCTIVITY AND CAN BE SWELLED TO SEVERAL TIMES THEIR VOLUME. BENTONITE AND CATIONIC ION EXCHANGERS ARE PARTICULARLY SUITABLE AS THE FILLER SUBSTANCES. THE SUSPENSION IS MIXED WITH AN ACID RESISTANT LATEX AND FORMED INTO A FINISHED COVER LAYER.
Inventors
- 👤 W Naschwitz
- 👤 E Knust
Bibliographic Details
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |