Patent US3738874A successfully refreshed from Google Patents.
US3738874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature steel process
Assignee: ALAN WOOD STEEL CO US
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Filing: 1971-05-26
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Granted: 1973-06-12
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Expires: 1991-05-26
Abstract
Abstract THE PROCESS OF MAKING A LOW TEMPERATURE WELDABLE STEEL PLATE OF PLAIN CARBON GRADE AND UNUSUALLY HIGH IMPACT RESISTANCE AND YIELD STRENGTH IN NORMALIZED CONDITION. THE STEEL CONTAINS CAREFULLY CONTROLLED AMOUNTS OF CARBON, MANGANESE, SULFUR, PHOSPHORUS, SILICON, ALUMINUM AND NITROGEN, PLUS ALLOYING ELEMENTS WHICH MAY INCLUDE CHROMIUM, COPPER, AND NICKEL, CERTAIN OF WHICH COMPONENTS CAN BE ACHIEVED AS RESIDUAL ELEMENTS IN SCRAP. THE ALLOY WILL BE USED ESPECIALLY AS PLATE.
Inventors
- 👤 A Allten
- 👤 F Semel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:36
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/001
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |