US3617039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Descaling apparatus for steel
Assignee: Mitsubishi Heavy Industries Ltd
•
Filing: 1969-07-03
•
Granted: 1971-11-02
•
Expires: 1989-07-03
Abstract
Abstract Steel is descaled by applying a thin layer of alkali metal hydroxide to the surface to be descaled and subsequently heating the coated steel to a temperature above the melting point of the alkali metal hydroxide in an oxygen-containing atmosphere. According to an alternative embodiment, an alkali metal salt solution is sprayed onto hot steel emanating from an annealing zone, whereby the water of the solution evaporates substantially immediately and the alkali metal salt melts. Apparatus for the alternative embodiment is also disclosed.
Inventors
- 👤 Saburo Fukui
- 👤 Tsunehiro Yamazaki
- 👤 Masato Yamamoto
- 👤 Masuichi Miyake
- 👤 Masanori Okumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:13
CPC Classifications
C; C23; C23G; C23G3/00; C23G3/02; C23G1/00; C23G1/14; C23G1/19; C23G3/027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
Apparatus as claimed in claim 1, further comprising pickling means adjacent said washing means for pickling the steel and second washing means for washing the pickled steel.
Claim 2
Dependent Claim
24 words
Apparatus as claimed in claim 1, wherein said wetting means comprises a plurality of nozzles and means for continuously feeding solution to said nozzles.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |