Patent US3155550A successfully refreshed from Google Patents.
US3155550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment of chromium-free steel bearings
Assignee: United States Steel Corp
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Filing: 1961-09-15
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Granted: 1964-11-03
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Expires: 1981-09-15
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Mitchell
- 👤 Mary E Potter
- 👤 Edmond J Whittenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:47
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
THE METHOD OF PRODUCING STEEL SUITABLE FOR BEARINGS CHARACTERIZED BY GOOD WEAR RESISTANCE AND STRESS RESISTANCE AT TEMPERATURES ABOVE 300*F., COMPRISING MAKING CHROMIUM-FREE STEEL CONTAINING
Claim 2
Independent Claim
25 words
THE METHOD OF PRODUCING STEEL SUITABLE FOR BEARINGS CHARACTERIZED BY GOOD WEAR RESISTANCE AND STRESS RESISTANCE AT TEMPERATURES ABOVE 300*F., COMPRISING MAKING CHROMIUM-FREE STEEL CONTAINING
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-03 | 1968-05-04 | 1968-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-03 | 1972-05-04 | 1972-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-03 | 1976-05-04 | 1976-11-03 | $7700.00 | Window Closed / Lapsed |