Sintered hard metal product
Abstract
Abstract AN IMPROVED SINTERED HARD METAL COMPOSITION IS PROVIDED COMPRISED ESSENTIALLY OF REFRACTORY METAL COMPOUND GRAINS OR PARTICLES COATED WITH A REFRACTORY CARBIDE LAYER TO IMPART WETTABILITY TO REFRACTORY METAL COMPOUND GRAINS WHICH ARE DIFFICULT TO WET WITH SUCH BINDER METALS AS THE IRON GROUP METALS. THE WETTABLE REFRACTORY CARBIDE COATING IS FORMED BY DEPOSITING A LAYER OF THE CORRESPONDING REFRACTORY METAL UPON THE GRAINS FROM A HALIDE OF THE METAL, WHICH LAYER IS THEREAFTER CARBURIZED; OR THE CARBIDE COATING MAY BE PRODUCED SIMULTANEOUSLY ON THE SURFACE OF THE GRAINS FROM AN ATMOSPHERE COMPRISING HALIDE VAPOR IN THE PRESENCE OF A CARBURIZING AGENT, IN WHICH HYDROGEN MAY OR MAY NOT BE PRESENT. THE COATED REFRACTORY METAL COMPOUND GRAINS MAY OPTIONALLY BE MIXED WITH WETTABLE REFRACTORY METAL CARBIDE GRAINS IS PRODUCING SINTERED HARD METAL COMPOSITIONS.
Inventors
- 👤 L Ramqvist
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |