Patent US2670310A successfully refreshed from Google Patents.
US2670310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quenching steel
Assignee: Individual
•
Filing: 1946-12-13
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Granted: 1954-02-23
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Expires: 1966-12-13
Abstract
No abstract record available.
Inventors
- 👤 Michael W Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:13
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/56; C21D1/60; C21D1/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
THE METHOD OF HARDENING STEELS WHICH ARE HARDENABLE BY HEATNG SUCH STEEL TO A TEMPERATURE COMPRISES HEATING SUCH STEEL TO A TEMPERATURE ABOVE ITS CRITICAL TEMPERATURE AND QUENCHING SUCH HEATED STEEL BY IMMERSION IN A QUENCHING LIQUID MEDIUM CONTAINING A MINOR AMOUNT OF AN ORGANIC SULFONATE THE QUENCHING MEDIUM BEING SELECTED FROM THE GROUP CONSISTING OF OIL, WATER, AND OIL-WATER EMULSIONS.
Claim 2
Independent Claim
61 words
THE METHOD OF HARDENING STEELS WHICH ARE HARDENABLE BY HEATNG SUCH STEEL TO A TEMPERATURE COMPRISES HEATING SUCH STEEL TO A TEMPERATURE ABOVE ITS CRITICAL TEMPERATURE AND QUENCHING SUCH HEATED STEEL BY IMMERSION IN A QUENCHING LIQUID MEDIUM CONTAINING A MINOR AMOUNT OF AN ORGANIC SULFONATE THE QUENCHING MEDIUM BEING SELECTED FROM THE GROUP CONSISTING OF OIL, WATER, AND OIL-WATER EMULSIONS.
References Cited (Backward Citations)
US1990009A
Cited
US2375315A
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US2327977A
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US2327383A
Cited
US2504552A
Cited
US2483725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |