Method for coating metal powders
Abstract
Abstract THIS INVENTION RELATES TO A METHOD FOR PREPARING METAL POWDERS FOR COMPACTING BY POWDER METALLURGY TECHNIQUES. IN PARTICULAR IT RELATES TO AN ARRANGEMENT FOR UNIFORMLY COATING THE POWDER WITH AN ELEMENT, SUCH AS A CARBON-CONTAINING MATERIAL, FOR EXAMPLE LAMPBLACK, PRIOR TO COMPACTING. THIS IS ACHIEVED BY AGITATING A CHARGE OF METAL POWDER CONTAINING WATER WHILE INCREASING THE TEMPERATURE OF THE POWDER TO VAPORIZE AT LEAST A PORTION OF THE WATER. IN THIS MANNER THE WATER IS SUBSTANTIALLY EVENLY DISPERSED THROUGHOUT THE POWDERED METAL. A QUANTITY OF THE ELEMENT TO BE COATED ON THE POWDER IS ADDED IN FINELY DIVIDED FORM AND THE POWDERED METAL AND ELEMENT ARE FURTHER AGITATED IN THE PRESENCE OF THE WATER VAPOR, WHICH CAUSES THE ELEMENT TO BE SUBSTANTIALLY UNIFORMLY COATED OVER AND THROUGHOUT THE POWDER.
Inventors
- 👤 Thomas S Cloran
Bibliographic Details
Claims Analysis
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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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |