US2549468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic sound recording medium
Assignee: General Electric Co
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Filing: 1947-11-20
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Granted: 1951-04-17
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Expires: 1967-11-20
Abstract
No abstract record available.
Inventors
- 👤 Goodwin H Howe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:23
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/642; Y; Y10; Y10S; Y10S29/00; Y10S29/028
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
THE METHOD OF PREPARING A STAINLESS STEEL MAGNETIC RECORDING WIRE HAVING GOOD MAGNETIC SOUND RECORDING PROPERTIES, WHICH METHOD COMPRISES MECHANICALLY WORKING A SOFTENED AUSTENITIC STAINLESS STEEL WIRE CONTAINING 17-20 PERCENT CHROMIUM, 7-10 PERCENT NICKEL, AND 0.03 TO 0.25 PERCENT CARBON BY A COLD DRAWING PROCESS TO REDUCE ITS CROSS-SECTIONAL AREA BY AT LEAST ABOUT 94 PERCENT TO A DIAMETER OF ABOUT 4 MILES THEREBY TO PRODUCE AN ELONGATED CRYSTALLINE STRUCTURE IN SAID STEEL AND AGING THE WORK WIRE AT A TEMPERATURE BETWEEN 500* C. AND 700* C. FOR A PERIOD SUFFICIENT TO BRING THE WIRE TO TEMPERATURE AND CAUSE A PRECIPITATION OF CARBIDES PRESENT IN SAID STEEL.
Claim 2
Independent Claim
107 words
THE METHOD OF PREPARING A STAINLESS STEEL MAGNETIC RECORDING WIRE HAVING GOOD MAGNETIC SOUND RECORDING PROPERTIES, WHICH METHOD COMPRISES MECHANICALLY WORKING A SOFTENED AUSTENITIC STAINLESS STEEL WIRE CONTAINING 17-20 PERCENT CHROMIUM, 7-10 PERCENT NICKEL, AND 0.03 TO 0.25 PERCENT CARBON BY A COLD DRAWING PROCESS TO REDUCE ITS CROSS-SECTIONAL AREA BY AT LEAST ABOUT 94 PERCENT TO A DIAMETER OF ABOUT 4 MILES THEREBY TO PRODUCE AN ELONGATED CRYSTALLINE STRUCTURE IN SAID STEEL AND AGING THE WORK WIRE AT A TEMPERATURE BETWEEN 500* C. AND 700* C. FOR A PERIOD SUFFICIENT TO BRING THE WIRE TO TEMPERATURE AND CAUSE A PRECIPITATION OF CARBIDES PRESENT IN SAID STEEL.
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) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |