Patent US3744979A successfully refreshed from Google Patents.
US3744979A
Expired / Lapsed
US
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Method of forming a hard surface on cemented carbides and resulting article
Assignee: Hertel Cutting Technologies Inc
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Filing: 1971-04-14
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Granted: 1973-07-10
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Expires: 1991-04-14
Abstract
Abstract CEMENTED CARBIDE CUTTERS ARE TREATED WITH BORON CARBIDE AND HYDRIDE OF A REACTIVE OR REFRACTORY METAL AT TEMPERATURES ABOVE 500*C. THIS PROCESS HARDENS THE SURFACE OF THE CUTTER AND DECREASES WEAR IN MACHINING OF VARIOUS METALS.
Inventors
- 👤 H Kalish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:57
CPC Classifications
C; C23; C23C; C23C30/00; C23C30/005; C22; C22C; C22C29/00; C23C12/00; C23C12/02; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10S428/9335; Y10S428/938
Claims Analysis
Total Claims: 0
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References 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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |