US2799606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Products for and methods of quenching to harden steels
Assignee: Individual
•
Filing: 1954-02-23
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Granted: 1957-07-16
•
Expires: 1974-02-23
Abstract
No abstract record available.
Inventors
- 👤 Michael W Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:47
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE METHOD OF HARDENING STEELS WHICH ARE HARDENABLE BY HEATING AND QUENCHING WHICH 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 A SULFUR AND PHOSPHORUS CONTAINING REACTION PRODUCT OBTAINED BY REACTING A PHOSPHORUS SULFIDE AT A TEMPERATURE OF FROM ABOUT 212 TO 660*F. AND AN ORGANIC SULFONATE, THE QUENCHING MEDIUM SELECTED FROM THE GROUP CONSISTING OF OIL, WATER, AND OIL-WATER EMULSIONS.
Claim 2
Independent Claim
81 words
THE METHOD OF HARDENING STEELS WHICH ARE HARDENABLE BY HEATING AND QUENCHING WHICH 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 A SULFUR AND PHOSPHORUS CONTAINING REACTION PRODUCT OBTAINED BY REACTING A PHOSPHORUS SULFIDE AT A TEMPERATURE OF FROM ABOUT 212 TO 660*F. AND AN ORGANIC SULFONATE, THE QUENCHING MEDIUM SELECTED FROM THE GROUP CONSISTING OF OIL, WATER, AND OIL-WATER EMULSIONS.
References Cited (Backward Citations)
US253403A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-15 | 1961-01-14 | 1961-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-15 | 1965-01-14 | 1965-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-15 | 1969-01-14 | 1969-07-16 | $7700.00 | Window Closed / Lapsed |