US3216868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevated temperature working and heat treatment of stainless steel
Assignee: Lasalle Steel Co
•
Filing: 1961-03-06
•
Granted: 1965-11-09
•
Expires: 1981-03-06
Abstract
No abstract record available.
Inventors
- 👤 Elliot S Nachtman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:17
CPC Classifications
C; C21; C21D; C21D8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
THE PROCESS OF TREATING STAINLESS STEEL HARDENABLE BY SOME MODE OF PRECIPITATION COMPRISING THE STEPS OF SOLUTION TREATING THE STEEL, COOLING THE STEEL AND INTRODUCING THE STEEL INTO A MEDIUM MAINTAINED AT A TEMPERATURE ABOVE 250*F., HOLDING THE STEEL AT THIS TEMPERATURE FOR A TIME SUFFICIENT TO PRODUCE A SUBSTANTIAL HARDNESS INCREASE IN THE METAL WITHOUT OVER-AGING THE METAL, AND FINALLY WORKING THE STEEL WHILE IT IS STILL MAINTAINED AT THIS TEMPERATURE TO ACHIEVE A REDUCTION OF A FEW PERCENT UP TO ABOUT 50 PRECENT.
Claim 2
Dependent Claim
85 words
THE PROCESS OF TREATING STAINLESS STEEL HARDENABLE BY SOME MODE OF PRECIPITATION COMPRISING THE STEPS OF SOLUTION TREATING THE STEEL, COOLING THE STEEL AND INTRODUCING THE STEEL INTO A MEDIUM MAINTAINED AT A TEMPERATURE ABOVE 250*F., HOLDING THE STEEL AT THIS TEMPERATURE FOR A TIME SUFFICIENT TO PRODUCE A SUBSTANTIAL HARDNESS INCREASE IN THE METAL WITHOUT OVER-AGING THE METAL, AND FINALLY WORKING THE STEEL WHILE IT IS STILL MAINTAINED AT THIS TEMPERATURE TO ACHIEVE A REDUCTION OF A FEW PERCENT UP TO ABOUT 50 PRECENT.
References Cited (Backward Citations)
US2365956A
Cited
US2369805A
Cited
US2527521A
Cited
US2801916A
Cited
US2892702A
Cited
US2905577A
Cited
US2934463A
Cited
US3053703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |