US3708322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a coated ferrous substrate
Assignee: British Steel PLC
•
Filing: 1970-10-02
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Granted: 1973-01-02
•
Expires: 1990-10-02
Abstract
Abstract The invention concerns a method of producing a coated ferrous substrate having improved spot welding characteristics comprising introducing a ferrous substrate into a bath of molten metallic coatant so as to coat the substrate therewith, withdrawing the coated substrate from the bath, and thereafter directing particles of metallic iron or iron-based alloy onto the coated substrate, before the molten coatant thereon solidifies, so that the particles are retained adjacent the surface of the coatant during solidification of the latter.
Inventors
- 👤 A Jackson
- 👤 R Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:28
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/26; C23C2/265; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12104; Y10T428/12111; Y10T428/12125; Y10T428/12132; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
23 words
A method as claimed in claim 1 in which the said velocity is in the range of 300 to 500 feet per minute.
Claim 2
Dependent Claim
34 words
A method as claimed in claim 1 in which the quantity of particles directed onto each square foot of the surface of the coated substrate is in the range of 1 to 3 grams.
Claim 3
Dependent Claim
72 words
A method as claimed in claim 1 in which a second supply of the said particles is directed onto the coated substrate after the application thereto of the first supply thereof but before the molten coatant solidifies, the said second supply being smaller in quantity than the first supply and being directed onto the coated substrate so as to reach the latter at a velocity greater than that of the first supply.
Claim 4
Dependent Claim
25 words
A method as claimed in claim 4 in which the velocity of the second supply is in the range 500 to 1000 feet per minute.
Claim 5
Dependent Claim
38 words
A method as claimed in claim 4 in which the amount of the said second supply which is directed onto each surface of the coated substrate is in the range of 0.1 to 0.2 gram per square foot.
Claim 6
Dependent Claim
29 words
A method claimed in claim 1 in which, after the molten coatant has solidified, an outermost layer of metallic iron is deposited onto, without being diffused into, the coatant.
Claim 7
Dependent Claim
24 words
A method as claimed in claim 1 in which the particles are directed onto the coated substrate by being carried in a gas stream.
Claim 8
Dependent Claim
21 words
A method as claimed in claim 1 in which the substrate is a strip which is continuously moved through the bath.
Claim 9
Dependent Claim
30 words
A method as claimed in claim 9 in which the excess molten coatant on the strip is removed by passing the latter through the nip of a pair of rolls.
Claim 10
Dependent Claim
22 words
A method as claimed in claim 9 in which the excess molten coatant on the strip is blown back into the bath.
References Cited (Backward Citations)
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US2964419A
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US3017689A
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Cited
US3586614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |