US3574000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High flexibility steel wire and method of treating same
Assignee: Huettenwerk Oberhausen AG
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Filing: 1969-02-17
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Granted: 1971-04-06
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Expires: 1989-02-17
Abstract
Abstract STEEL WIRE COMING HOT FROM A ROLLING MILL IS RAPIDLY COOLED, PREFERABLY WITH THE AID OF A FLUIDIZED BED, TO A TEMPERATURE BETWEEN ABOUT 500* AND 550* WHERE TRANSFORMATION OF AUSTENITE TO PEARLITE TAKES PLACE, THE FINAL PHASE OF THIS TRANSFORMATION TAKING PLACE SUBSTANTIALLY ISOTHERMALLY. THIS WIRE, WHEN DRAWN TO A FRACTION OF ITS ORIGINAL DIAMETER, MANIFESTS A MICROCRYSTALLINE STRUCTURE WITH DISTINCT LAMELLATE ZONES AND HAS IMPROVED TORSIONAL AND FLEXURAL CAPACITY COMPARED WITH LEAD-PATENTED AND AIR-PATENTED WIRES.
Inventors
- 👤 Hans Geipel
- 👤 Wilfried Heinemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:36
CPC Classifications
B; B21; B21B; B21B45/00; B21B45/02; B21B45/0203; B21B45/0209; B21B45/0215; B21B45/0224; C; C21; C21D; C21D8/00; C21D8/06
Claims Analysis
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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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |