US3012879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrogen containing tool steels
Assignee: Crucible Steel Company of America
•
Filing: 1960-02-24
•
Granted: 1961-12-12
•
Expires: 1980-02-24
Abstract
No abstract record available.
Inventors
- 👤 Schempp Reinhold
- 👤 Joseph B Schrader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:54
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
AN IMPROVED ALLOY TOOL STEEL CAPABLE OF BEING HARDENED BY HEAT TREATMENT CONSISTING ESSENTIALLY OF 0.85 TO 0.95% CARBON, 0.25 TO 0.05% MANGANESE, 0.20 TO 0.50% SILICON, 2 TO 7% CHROMIUM, 0.5 TO 5% VANADIUM, UP TO 10% TUNGSEN, 1 TO 12% MOLYBDENUM, 0.05 TO LESS THAN 0.13% NITROGEN, UP TO 10% COBALT, BALANCE IRON PLUS COMMERCIAL IMPURTIES.
Claim 2
Dependent Claim
58 words
AN IMPROVED ALLOY TOOL STEEL CAPABLE OF BEING HARDENED BY HEAT TREATMENT CONSISTING ESSENTIALLY OF 0.85 TO 0.95% CARBON, 0.25 TO 0.05% MANGANESE, 0.20 TO 0.50% SILICON, 2 TO 7% CHROMIUM, 0.5 TO 5% VANADIUM, UP TO 10% TUNGSEN, 1 TO 12% MOLYBDENUM, 0.05 TO LESS THAN 0.13% NITROGEN, UP TO 10% COBALT, BALANCE IRON PLUS COMMERCIAL IMPURTIES.
Claim 3
Independent Claim
118 words
A METHOD OF IMPARTING INCREASED ATTAINABLE HARDNESS IN ALLOY TOOL STEEL CONSISTING ESSENTIALLY OF 0.85 TO 0.95% CARBON, 0.25 TO 0.50% MANGANESE, 0.20 TO 0.50% SILICON, 2 TO 7% CHROMIUM, 0.5 TO 5% VANADIUM, UP TO 10% TUNGSTEN, 1 TO 12% MOLYBDENUM, UP TO 10% COBALT, BALANCE IRON PLUS COMMERICAL IMPURITIES, COMPRISING STEPS OF ADDING NITROGEN TO A MELT OF SAID STEEL IN AN AMOUNT EFFECTIVE TO PRODUCE A RESIDUE TO 0.05 TO LESS THAN 0.13% THEREIN, CASTING THE NITROGEN CONTAINING STEEL INTO INGOTS, FORGING AND ANNEALING SAID INGOTS, HEATING THE RESULTANT PRODUCT AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 2150* TO 2250*F., QUENCHING AND REHEATING AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 950* TO 1100*F.
Claim 4
Independent Claim
118 words
A METHOD OF IMPARTING INCREASED ATTAINABLE HARDNESS IN ALLOY TOOL STEEL CONSISTING ESSENTIALLY OF 0.85 TO 0.95% CARBON, 0.25 TO 0.50% MANGANESE, 0.20 TO 0.50% SILICON, 2 TO 7% CHROMIUM, 0.5 TO 5% VANADIUM, UP TO 10% TUNGSTEN, 1 TO 12% MOLYBDENUM, UP TO 10% COBALT, BALANCE IRON PLUS COMMERICAL IMPURITIES, COMPRISING STEPS OF ADDING NITROGEN TO A MELT OF SAID STEEL IN AN AMOUNT EFFECTIVE TO PRODUCE A RESIDUE TO 0.05 TO LESS THAN 0.13% THEREIN, CASTING THE NITROGEN CONTAINING STEEL INTO INGOTS, FORGING AND ANNEALING SAID INGOTS, HEATING THE RESULTANT PRODUCT AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 2150* TO 2250*F., QUENCHING AND REHEATING AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 950* TO 1100*F.
References Cited (Backward Citations)
AT187929B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-11 | 1965-06-12 | 1965-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-11 | 1969-06-12 | 1969-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-11 | 1973-06-12 | 1973-12-12 | $7700.00 | Window Closed / Lapsed |