Cutting tool
Abstract
Abstract An improved cutting tool is provided, especially useful for hand shears. The cutting edge of the tool is made of a wear-resistant material of either: (a) 85% to 96% tungsten carbide and 15% to 4% cobalt, (b) 60% to 89% tungsten carbide, 4% to 28% tantalum carbide, 4% to 25% titanium carbide and 3% to 30% cobalt, or (c) 34% to 51% cobalt, 25% to 32% chromium, 14% to 21% tungsten, 2% to 4% carbon and one or more of the metals nickel, silicon, columbium, manganese and iron which, together, comprise no more than 16% of the material. For material "b", preferably the composition contains about 5% to 13% cobalt, 65% to 89% tungsten carbide, titanium carbide and tantalum carbide which, together, are present in an amount no greater than 30% of the composition of the material. For material "c", preferably the composition contains about 28% to 32% chromium, 43% to 48% cobalt, tungsten and one or more of nickel, silicon, iron, manganese, columbium and carbon which, together, are present in an amount no greater than 29% of the composition of the material.
Inventors
- 👤 Frank J. Penoza
Bibliographic Details
Claims Analysis
Total Claims: 8References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |