Patent US3928025A successfully refreshed from Google Patents.
US3928025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool steel for hot working
Assignee: Proterial Ltd
•
Filing: 1974-11-27
•
Granted: 1975-12-23
•
Expires: 1994-11-27
Abstract
Abstract A tool steel for hot working containing, in weight percent, from 0.25 to 0.60% carbon, not more than 0.6% silicon, from 0.50 to 1.50% manganese, from 0.50 to 1.50% nickel, from 1.50 to 3.50% chromium, from 2.00 to 4.50% molybdenum, from 1.20 to 3.00 vanadium, from 0.50 to 5.00% cobalt, balance essentially iron and impurities, or containing, in weight percent, from 0.25 to 0.60% carbon, not more than 0.60% silicon, from 0.50 to 1.50% manganese, from 0.50 to 1.50% nickel, from 1.50 to 3.50% chromium, from 0.50 to 3.50% tungsten, from 1.50 to 3.00% molybdenum, from 1.20 to 3.00% vanadium, from 0.50 to 5.00% cobalt, balance essentially iron and impurities. This tool steel affords excellent high temperature mechanical strength, toughness, high temperature wear resistance, and heat check resistance.
Inventors
- 👤 Toshio Okuno
- 👤 Rinzo Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:33
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44; C22C38/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
A TOOL STEEL FOR HOT WORKING CONSISTING ESSENTIALLY OF, IN WEIGHT PERCENT, FROM 0.25 TO 0.60% CARBON, NOT MORE THAN 0.6% SILICON, FROM 0.50 TO 1.50% MAGANESE, FROM 0.50 TO 1.50% NICKEL, FROM 1.50 TO 3.50% CHROMIUM, FROM 2.00 TO 4.50% MOLYBDENUM, FROM 1.20 TO 3.00% VANADIUM, FROM 0.50 TO 5.00% COBALT, BALANCE ESSENTIALLY IRON AND IMPURITIES.
Claim 2
Dependent Claim
57 words
A TOOL STEEL FOR HOT WORKING CONSISTING ESSENTIALLY OF, IN WEIGHT PERCENT, FROM 0.25 TO 0.60% CARBON, NOT MORE THAN 0.6% SILICON, FROM 0.50 TO 1.50% MAGANESE, FROM 0.50 TO 1.50% NICKEL, FROM 1.50 TO 3.50% CHROMIUM, FROM 2.00 TO 4.50% MOLYBDENUM, FROM 1.20 TO 3.00% VANADIUM, FROM 0.50 TO 5.00% COBALT, BALANCE ESSENTIALLY IRON AND IMPURITIES.
Claim 3
Dependent Claim
57 words
A tool steel for hot working consisting essentially of, in weight percent, from 0.03 to 0.50% carbon, no more than 0.60% silicon, from 0.50 to 1.00% manganese from 0.70 to 1.40% nickel, from 2.00 to 3.50% chromium, from 2.5 to 3.50% molybdenum, from 1.20 to 2.50% vanadium, from 0.70 to 4.00% cobalt, balance essentially iron and impurities.
Claim 4
Dependent Claim
57 words
A tool steel for hot working consisting essentially of, in weight percent, from 0.03 to 0.50% carbon, no more than 0.60% silicon, from 0.50 to 1.00% manganese from 0.70 to 1.40% nickel, from 2.00 to 3.50% chromium, from 2.5 to 3.50% molybdenum, from 1.20 to 2.50% vanadium, from 0.70 to 4.00% cobalt, balance essentially iron and impurities.
Claim 5
Dependent Claim
62 words
A tool steel for hot working consisting essentially of, in weight percent, from 0.25 to 0.60% carbon, not more than 0.60% silicon, from 0.50 to 1.50% manganese, from 0.50 to 1.50% nickel, from 1.50 to 3.50% chromium, from 0.50 to 3.50% tungsten, from 1.50 to 3.00% molybdenum, from 1.20 to 3.00% vanadium, from 0.50 to 5.00% cobalt, balance essentially iron and impurities.
Claim 6
Dependent Claim
62 words
A tool steel for hot working consisting essentially of, in weight percent, from 0.25 to 0.60% carbon, not more than 0.60% silicon, from 0.50 to 1.50% manganese, from 0.50 to 1.50% nickel, from 1.50 to 3.50% chromium, from 0.50 to 3.50% tungsten, from 1.50 to 3.00% molybdenum, from 1.20 to 3.00% vanadium, from 0.50 to 5.00% cobalt, balance essentially iron and impurities.
Claim 7
Dependent Claim
62 words
A tool steel for hot working consisting essentially of, in weight percent, from 0.30 to 0.50% carbon, no more than 0.60% silicon, from 0.50 to 1.00% manganese, from 0.70 to 1.40% nickel, from 2.00 to 3.50% chromium, from 1.00 to 3.50% tungsten, from 1.00 to 3.00% molybdenum, from 1.20 to 2.50% vanadium, from 0.70 to 4.00% cobalt, balance essentially iron and impurities.
Claim 8
Dependent Claim
62 words
A tool steel for hot working consisting essentially of, in weight percent, from 0.30 to 0.50% carbon, no more than 0.60% silicon, from 0.50 to 1.00% manganese, from 0.70 to 1.40% nickel, from 2.00 to 3.50% chromium, from 1.00 to 3.50% tungsten, from 1.00 to 3.00% molybdenum, from 1.20 to 2.50% vanadium, from 0.70 to 4.00% cobalt, balance essentially iron and impurities.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |