US3765205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for protecting hot metal surface
Assignee: Individual
•
Filing: 1970-01-30
•
Granted: 1973-10-16
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Expires: 1990-01-30
Abstract
Abstract Process for preventing the oxidation of hot metallic surfaces comprising coating the surfaces of the hot metal with a reducing agent which forms a protective pellicle, i.e., a thin skin or film, through which the state of the metal surface can still be observed during fabrication. The pellicle or film inhibits the formation of an oxide crust. The metal may be in solid or molten condition. The pellicle is formed by applying a reducing agent to the metal surface. The reducing agent may be applied as a cloud of fine particles, as a solution, or as vapors.
Inventors
- 👤 G Schaumburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:07
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/44; C21C5/441; C21C5/443; C21D; C21D1/00; C21D1/68; C21D1/82; C22; C22B; C22B9/00; C22B9/006; C22F; C22F1/00; C22F1/008; C23; C23C; C23C22/00; C23C22/70; C23C22/72; C23F; C23F15/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
A continuous process for forming a protective coating of hot ferrous metals during a hot foundry rolling operation comprising continuously contacting the hot ferrous metal, during hot rolling thereof, with a chemically reducing composition which forms a pellicle when heated, suppresses oxide formation on the surface of the ferrous metal being coated and forms a film through which the surface can be observed, whereby said protective coating is formed upon contact of said composition with said ferrous metal, said chemically reducing composition having the following initial composition, in parts by weight, 16.0 parts CaO, 4.5 parts SiO2, 3.6 parts Al2O3, 0.8 part Fe2O3, 2.4 parts MgO and 17 parts B.
Claim 2
Dependent Claim
110 words
A continuous process for forming a protective coating of hot ferrous metals during a hot foundry rolling operation comprising continuously contacting the hot ferrous metal, during hot rolling thereof, with a chemically reducing composition which forms a pellicle when heated, suppresses oxide formation on the surface of the ferrous metal being coated and forms a film through which the surface can be observed, whereby said protective coating is formed upon contact of said composition with said ferrous metal, said chemically reducing composition having the following initial composition, in parts by weight, 25.0 parts CaO, 7.0 parts SiO2, 4.2 parts Al2O3, 1.2 parts Fe2O3, 3.2 parts MgO and 17 parts Na.
Claim 3
Dependent Claim
113 words
A continuous process for forming a protective coating of hot ferrous metals during a hot foundry rolling operation comprising continuously contacting the hot ferrous metal, during hot rolling thereof, with a chemically reducing composition which forms a pellicle when heated, suppresses oxide formation on the surface of the ferrous metal being coated and forms a film through which the surface can be observed, whereby said protective coating Is formed upon contact of said composition with said ferrous metal, said chemically reducing composition having the following initial composition, in parts by weight, 17 parts CaO, 5 parts SiO2, 5 parts Al, 2 parts Fe2O3, 1.8 parts MgO, 37 parts TiO2 and 2.1 parts Na.
Claim 4
Dependent Claim
116 words
A continuous process for forming a protective coating of hot ferrous metals during a hot foundry rolling operation comprising continuously contacting the hot ferrous metal, during hot rolling thereof, with a chemically reducing composition which forms a pellicle when heated, suppresses oxide formation on the surface of the ferrous metal being coated and forms a film through which the surface can be observed, whereby said protective coating is formed upon contact of said composition with said ferrous metal, said chemically reducing composition having the following initial composition, in parts by weight, 22 parts CaO, 4 parts SiO2, 4 parts Al, 1.5 parts Fe2O3, 1.8 parts MgO, 12 parts TiO2, 10 parts Be and 1.7 parts Na.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |