Lead-bearing steel and method of manufacture
Abstract
Abstract THIS INVENTION RELATES TO A TOOL-STEEL COMPOSITION CHARACTERIZED BY IMPROVED MACHINABILITY BY THE ADDITION OF .5 TO 2% LEAD IN COMBINATION WITH SULFUR IN AN AMOUNT UP TO ABOUT .3%. ARTICLES CHARACTERIZED BY IMPROVED MACHINABILITY ARE PRODUCED IN ACCORDANCE WITH THE PRESENT INVENTION BY PROVIDING A CHARGE OF POWDERED METAL OF A DESIRED TOOL-STEEL COMPOSITION, COATING THE PARTICLES WITH LEAD OXIDE, THEREAFTER HEATING SAID CHARGE UNDER CONDITIONS OF TEMPERATURE AND PRESSURE TO DECOMPOSE SAID LEAD OXIDE BY GASSIFICATION AND THEN REMOVING THE PRODUCTS OF GASSIFICATION FROM THE POWDERED METAL CHARGE TO LEAVE THE PARTICLES COATED WITH LEAD. THE LEAD-CONTAINING CHARGE OF PARTICLES IS THEN COMPACTED TO FORM A DENSE COMPACT.
Inventors
- 👤 G Steven
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |