US3672877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion-resistant razor blades
Assignee: Sandvik AB
•
Filing: 1970-07-27
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Granted: 1972-06-27
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Expires: 1990-07-27
Abstract
Abstract STEELS SUITABLE FOR MAKING CORROSION-RESISTANT RAZOR BLADES CONTAIN CHROMIUM AND CARBON, AND MAY CONTAIN SILICON, MANGANESE, MOLYBDENUM, TUNGSTEN, COPPER, COBALT, NICKEL, NIOBIUM, TANTALUM, TITANIUM, VANADIUM, ZIRCONIUM, BORON OR BERYLLIUM. THE RATIO OF CHROMIUM TO CARBON IS LESS THAN 30:1; THE CARBON CONTENT IS 0.3-0.5 WT. PERCENT; THE SILICON CONTENT IS WITHIN THE RANGE 0.8-2.0 WT. PERCENT, AND THE CHROMIUM CONTENT IS 9-.-10.8 WT. PERCENT. A TOOL FORMED FROM A STEEL OF THIS CLASS HAS A HARDNESS EXCEEDING VPN 800 IN THE HARDENED CONDITION, AND A HARDNESS AFTER TEMPERING UP TO 45-0*C. WITHIN THE RANGE VPN 720850.
Inventors
- 👤 Jan-Christer Henric
- 👤 Claes Bertil Bergqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:10
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |