US3788843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steel having improved free-cutting properties
Assignee: JFE Engineering Corp
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Filing: 1971-06-30
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Granted: 1974-01-29
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Expires: 1991-06-30
Abstract
Abstract A MACHINE STRUCTURE STEEL HAVING SUPERIOR FREE-CUTTING PROPERTIES, YIELD STRENGTH AND TENSILE STRENGTH AND COMPRISING THE ADDITION OF 0.002% TO 0.02% CA, 0.005% TO 0.04% SOL. AL. AND 0.005% TO 0.1% NB AND/OR V, TO KNOWN COMPOSITION CONTAINED IN ORDINARY STEEL.
Inventors
- 👤 T Mimino
- 👤 K Nishikawa
- 👤 S Nara
- 👤 Y Miyashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:28
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/12
Claims Analysis
Total Claims: 0
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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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |