US4671932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nickel-based hard alloy
Assignee: BERLIN HERMAN C S
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Filing: 1984-04-27
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Granted: 1987-06-09
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Expires: 2004-04-27
Abstract
Abstract In order to obtain, in a hard alloy based on a nickel-chromium-boron-silicon alloy, particularly advantageous properties with regard to hardness and toughness, carbides of the elements vanadium, niobium, tantalum and/or chromium are added to the hard alloy.
Inventors
- 👤 Reinhold Lutz
- 👤 Helgo Wendt, deceased
- 👤 Helmut Meinhardt
- 👤 Heinz Eschnauer
- 👤 E. Lugscheider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:37
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/32; B23K35/327; B23K35/30; B23K35/3033; B23K35/304
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A hard alloy consisting essentially of: 22 to 27% by wt. of chromium, 2.5 to 2.7% by wt. of boron, 3 to 4% by wt. of silicon, 4 to 4.5% by wt. of iron, and 2.5 to 3.5% by wt. of carbon, the balance being nickel.
Claim 2
Dependent Claim
46 words
A hard alloy consisting essentially of: 22 to 27% by wt. of chromium, 2.5 to 2.7% by wt. of boron, 3 to 4% by wt. of silicon, 4 to 4.5% by wt. of iron, and 2.5 to 3.5% by wt. of carbon, the balance being nickel.
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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) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |