US2829996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the machining qualities of steel
Assignee: Bethlehem Steel Corp
•
Filing: 1953-04-06
•
Granted: 1958-04-08
•
Expires: 1973-04-06
Abstract
No abstract record available.
Inventors
- 👤 Donald W Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:46
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR IMPROVING THE MACHINING QUALITIES OF STEEL CONTAINING BETWEEN .05% AND .25% CARBON AND CONTAINING NOT OVER 5.00% OF ALLOYING INGREDIENTS OF THE GROUP CONSISTING OF NICKEL, COPPER, CHROMIUM, AND MOLYBDENUM, AND THE BALANCE CONSISTIONG ESSENTIALLY OF IRON, WHICH COMPRISES THE STEPS OF RAPIDLY COOLING THE STEEL FROM A TEMPERATURE BELOW THE LOWER CRITICAL POINT OF THE PARTICULAR STEEL BEING TREATED BUT NOT LESS THAN 900*F. TO A TEMPERATURE AT LEAST AS LOW AS 550*F., AND MAINTAINING THE STEEL AT A TEMPERATURE BETWEEN 300*F. AND 550*F. FOR AT LEAST ONE HOUR.
Claim 2
Dependent Claim
93 words
A PROCESS FOR IMPROVING THE MACHINING QUALITIES OF STEEL CONTAINING BETWEEN .05% AND .25% CARBON AND CONTAINING NOT OVER 5.00% OF ALLOYING INGREDIENTS OF THE GROUP CONSISTING OF NICKEL, COPPER, CHROMIUM, AND MOLYBDENUM, AND THE BALANCE CONSISTIONG ESSENTIALLY OF IRON, WHICH COMPRISES THE STEPS OF RAPIDLY COOLING THE STEEL FROM A TEMPERATURE BELOW THE LOWER CRITICAL POINT OF THE PARTICULAR STEEL BEING TREATED BUT NOT LESS THAN 900*F. TO A TEMPERATURE AT LEAST AS LOW AS 550*F., AND MAINTAINING THE STEEL AT A TEMPERATURE BETWEEN 300*F. AND 550*F. FOR AT LEAST ONE HOUR.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |