Patent US2683677A successfully refreshed from Google Patents.
US2683677A
Expired / Lapsed
US
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Method of precipitation hardening iron alloys
Assignee: Individual
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Filing: 1942-07-27
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Granted: 1954-07-13
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Expires: 1962-07-27
Abstract
No abstract record available.
Inventors
- 👤 Jr Francis M Walters
- 👤 Irvin R Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:36
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/08; C22C38/04; C21; C21D; C21D6/00; C21D6/001; C21D6/02; C22C38/18; C22C38/40; C22C38/58; C21D2211/00; C21D2211/001; C21D2211/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD OF PRECIPITATION-HARDENING A LOW CARBON IRON BASE ALLOY CONTAINING A MINOR PROPORTION OF A PRECIPITATION-HARDENING CONSTITUENT AND OF A CONSTITUENT FROM THE GROUP CONSISTING OF NICKEL AND MANGANESE, SAID ALLOY BEING CAPABLE OF UNDERGOING TRANSFORMING FROM AUSTENITE TO FERRITE ON COOLING AND HAVING A CONSTITUENT CONTENT FROM SAID NICKEL AND MANGANESE GROUP WHICH IS SUFFICIENT TO LOWER THE AUSTENITE-FERRITE TRANSFORMATION TEMPERATURE OF THE ALLOY TO A LEVEL AT WHICH THE RATE OF PRECIPITATION ON AIR COOLING IS INAPPRECIABLE, WHICH COMPRISES SLOW COOLING SAID ALLOY AT A RATE NOT SUBSTANTIALLY GREATER THAN THAT OF AIR COOLING FROM AUSTENITE SOLUTION TEMPERATURE THROUGH SAID TRANSFORMATION TEMPERATURE, HOLDING THE ALLOY AT A PRECIPITATION-HARDENING TEMPERATURE FOR A TIME SUFFICIENT TO DEVELOP HARDNESS THEREIN, AND COOLING THE ALLOY.
Claim 2
Independent Claim
124 words
A METHOD OF PRECIPITATION-HARDENING A LOW CARBON IRON BASE ALLOY CONTAINING A MINOR PROPORTION OF A PRECIPITATION-HARDENING CONSTITUENT AND OF A CONSTITUENT FROM THE GROUP CONSISTING OF NICKEL AND MANGANESE, SAID ALLOY BEING CAPABLE OF UNDERGOING TRANSFORMING FROM AUSTENITE TO FERRITE ON COOLING AND HAVING A CONSTITUENT CONTENT FROM SAID NICKEL AND MANGANESE GROUP WHICH IS SUFFICIENT TO LOWER THE AUSTENITE-FERRITE TRANSFORMATION TEMPERATURE OF THE ALLOY TO A LEVEL AT WHICH THE RATE OF PRECIPITATION ON AIR COOLING IS INAPPRECIABLE, WHICH COMPRISES SLOW COOLING SAID ALLOY AT A RATE NOT SUBSTANTIALLY GREATER THAN THAT OF AIR COOLING FROM AUSTENITE SOLUTION TEMPERATURE THROUGH SAID TRANSFORMATION TEMPERATURE, HOLDING THE ALLOY AT A PRECIPITATION-HARDENING TEMPERATURE FOR A TIME SUFFICIENT TO DEVELOP HARDNESS THEREIN, AND COOLING THE ALLOY.
References Cited (Backward Citations)
US1943595A
Cited
GB409355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-12 | 1958-01-11 | 1958-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-12 | 1962-01-11 | 1962-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-12 | 1966-01-11 | 1966-07-13 | $7700.00 | Window Closed / Lapsed |