US4395280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preheating process for steel-making materials
Assignee: Daido Steel Co Ltd
•
Filing: 1981-02-24
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Granted: 1983-07-26
•
Expires: 2001-02-24
Abstract
Abstract A preheating process for steel-making materials, in which the steel-making materials are preheated in a preheating furnace and transferred to a bucket in a clean state for charging them into the steel-making furnace by scattering any dust sticking to the materials by dumping them into the bucket and collecting the scattered dust.
Inventors
- 👤 Akira Takenouchi
- 👤 Yukio Niwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:05
CPC Classifications
F; F27; F27D; F27D13/00; F27D13/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
77 words
A preheating process for steelmaking materials, which comprises the steps of: (a) preheating steel making materials by contacting said materials with waste gas fluid containing dust from a steel-making furance in a preheating furnace, some of said dust sticking to said materials. (b) scattering any dust sticking to the heated steel-making materials by impact of dumping the materials, (c) collecting the scattered dust, and (d) charging the steel-making materials into the steel-making furnace after collecting the dust.
Claim 2
Dependent Claim
77 words
A preheating process for steelmaking materials, which comprises the steps of: (a) preheating steel making materials by contacting said materials with waste gas fluid containing dust from a steel-making furance in a preheating furnace, some of said dust sticking to said materials. (b) scattering any dust sticking to the heated steel-making materials by impact of dumping the materials, (c) collecting the scattered dust, and (d) charging the steel-making materials into the steel-making furnace after collecting the dust.
Claim 3
Dependent Claim
34 words
A preheating process for steel-making materials as set forth in claim 1, wherein the step of scattering any dust sticking to the heated steel-making materials is done by dumping the materials into a bucket.
Claim 4
Dependent Claim
34 words
A preheating process for steel-making materials as set forth in claim 1 or 2, the step of charging steel-making materials into the steel-making furnace after collecting the scattered dust is done by a bucket.
References Cited (Backward Citations)
US3399992A
Cited
SU850401A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-25 | 1987-01-24 | 1987-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-25 | 1991-01-24 | 1991-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-25 | 1995-01-24 | 1995-07-26 | $7700.00 | Window Closed / Lapsed |