US3592703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating circular saw blades and product produced thereby
Assignee: United States Steel Corp
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Filing: 1968-03-07
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Granted: 1971-07-13
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Expires: 1988-03-07
Abstract
Abstract A METHOD AND APPARATUS FOR HARDENING THE TEETH AND TOOTH ROOTS OF A SAW BLADE USED FOR CUTTING HOT STEEL SHAPES. BLADE ROTATES, WHILE ITS TEETH AND ROOTS ARE HEATED TO THE AUSTENITIZING TEMPERATURE AND QUENCHED BY A STATIONARY INDUCTION HEATING UNIT AND A STATIONARY QUENCH- ING DEVICE. SHIELD APPLIED TO BLADE TO PREVENT REHEATING AND SOFTENING OF PORTION FIRST HEATED AS IT RE-ENTERS HEATING UNIT. THE HARDENING TREATMENT FORESTALLS FAILURE THROUGH FATIGUE-CRACKING AT THE ROOTS.
Inventors
- 👤 Edward H Dehn
- 👤 Fernand J Dewez Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:34
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/24; Y; Y10; Y10S; Y10S148/00; Y10S148/902; Y10S148/905
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |