Temperature and stress resistant body
Abstract
Abstract A HIGH TEMPERATURE AND STRESS RESISTANT BODY OF DESIRED POROSITY IS MADE BY FORMING A GREEN POROUS BODY (FIGS. 4,5,9,10) OF HIGHER THAN THE DESIRED POROSITY BY COMPACTING DIFFERENT SIZE FRACTIONS OF SPHERICAL PARTICLES (A, 23,27 FIGS. 4,5) OR BY WINDING FINE COLD-DRAWN WIRE (53 FIG.9) OR MESH OF FINE COLD-DRAWN WIRE (73 FIG. 10) ON A MANDREL (51 FIG.7; FIG. 10). THE GREEN BODY IS CEMENTED INTO A RIGID BODY AND AT THE SAME TIME ITS POROSITY IS DECREASED TO THE DESIRED MAGNITUDE BY DEPOSITING CEMENTING MATERIAL (H5 FIG. 11, 61 FIG. 9, 77 FIG. 10) IN THE PORES (25 FIGS. 5 AND 6; 55 FIG. 9) FROM A GAS. TYPICALLY A BODY OF TUNGSTEN IS FORMED BY REDUCING A TUNGSTEN HALIDE IN THE PORES WITH HYDROGEN.
Inventors
- 👤 Zalman M Shapiro
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |