US2819957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steel alloys for making magnetic recordings
Assignee: C POUPLIER JR
•
Filing: 1954-12-24
•
Granted: 1958-01-14
•
Expires: 1974-12-24
Abstract
No abstract record available.
Inventors
- 👤 Appel Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:18
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/642
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A STEEL ALLOY FOR MATERIALS USED IN MAKING MAGNETIC RECORDINGS WITH HIGH FREQUENCY SOUNDS, SAID ALLOY HAVING MATASTABLE AUSTENITIC STRUCTURE AND A COERCIVE FORCE OF AT LEAST 300 OERSTED; AND CONTAINING FROM 0.8 TO 5% MANGANESE, 15-40% NICKEL, ABOUT 2.5 CHROMIUM, ABOUT 0.21-2% SILICON, 0.3-1.5% CARBON, BALANCE IRON, AND MINOR AMOUNTS OF IMPURITIES.
Claim 2
Dependent Claim
53 words
A STEEL ALLOY FOR MATERIALS USED IN MAKING MAGNETIC RECORDINGS WITH HIGH FREQUENCY SOUNDS, SAID ALLOY HAVING MATASTABLE AUSTENITIC STRUCTURE AND A COERCIVE FORCE OF AT LEAST 300 OERSTED; AND CONTAINING FROM 0.8 TO 5% MANGANESE, 15-40% NICKEL, ABOUT 2.5 CHROMIUM, ABOUT 0.21-2% SILICON, 0.3-1.5% CARBON, BALANCE IRON, AND MINOR AMOUNTS OF IMPURITIES.
References Cited (Backward Citations)
US1715541A
Cited
US2568326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |