US3795550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment process for non-alloyed low-carbon structural steel
Assignee: Baustahlgewebe GmbH
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Filing: 1971-04-29
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Granted: 1974-03-05
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Expires: 1991-04-29
Abstract
Abstract A LOW CARBON STEEL CAN BE HEAT TREATED TO IMPROVE EITHER ITS PHYSICAL PROPERTIES OR ITS ELONGATION WITHOUT DETRIMENT TO THE OTHER BY HEATING A SHELL REGION OF THE STEEL QUICKLY AND THEN ALLOWING HEAT TRANSFER TO TAKE PLACE UNTILE THE SHELL TEMPERATURE PREFERABLY DROPS TO THE VALUE OF THE CORE TEMPERATURE WHEREUPON THE STEEL IS INTENSIVELY QUENCHED IN WATER.
Inventors
- 👤 L Ettenreich
- 👤 O Reimann
- 👤 K Greulich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:15
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/18
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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |