US3689941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating and soldering stainless steel parts
Assignee: Chausson Usines SA
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Filing: 1970-06-23
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Granted: 1972-09-12
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Expires: 1990-06-23
Abstract
Abstract The two faces of a sheet or thin strip of stainless steel are covered with a thin coating of lead, and is used for constituting the tubes, collector, water-boxes as well as the pipes of a radiator, and the parts thus made are soldered together with a tin-lead alloy by the same operational cycle as with corresponding parts made of brass or copper.
Inventors
- 👤 Andre Chartet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:27
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F21/081; F28F21/082; B; B21; B21D; B21D53/00; B21D53/02; B23; B23K; B23K1/00; B23K1/0008; B23K1/0012; B23K35/00; B23K35/001; B23K35/004; C; C23; C23C; C23C2/00; C23C2/04; C23C2/10; F28D; F28D1/00; F28D1/02; F28D1/03; F28F9/00; F28F9/02; F28F9/04; F28F9/16; F28F9/18; Y; Y10; Y10S; Y10S29/00; Y10S29/037; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49393; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
Method according to claim 1, wherein the sheets are covered with a thin coat of a lead-tin alloy.
Claim 2
Dependent Claim
29 words
Method according to claim 1, comprising the further step of submitting the sheet, before deoxidizing, to degreasing, then to pickling in a fluonitric bath whereby the steel is depassivated.
Claim 3
Dependent Claim
45 words
Method according to claim 3, wherein the step of deoxidizing the sheets includes subjecting the depassivated sheets to a pickling bath containing from three to four moles of acid by liter, then to a fluxing step in a molten bath containing zinc and ammonium chlorides.
Claim 4
Dependent Claim
42 words
Method according to claim 4, wherein the step of covering includes dipping the fluxed sheet in a molten bath of a high lead percentage alloy, and wiping the sheet whereby the coating has a thickness between 0.5 Mu and 20 Mu .
Claim 5
Independent Claim
227 words
A method of making products comprising at least some parts made from sheets of stainless steel and some portions of copper alloys, said stainless steel containing no nickel and at least 13 percent by weight of chromium, which method includes the steps of pickling the sheets of stainless steel in a fluonitric bath; keeping the pickled sheet in a dry atmosphere before use; at the moment of use; pickling the dried sheets in an aqueous bath with at least one acid selected from the group consisting of fluonitric and hydrochloric acids; rinsing the pickled sheets with water; and immediately after said rinsing, the further step of dipping the rinsed sheets in a bath containing a mixture of molten zinc and ammonium chlorides and then removing the sheets coated with the mixture of molten zinc and ammonium chlorides; dipping the coated sheets in a bath containing a molten lead and tin mixture and then removing the sheets covered with the molten lead and tin miXture; wiping the covered sheets of the excess of still molten tin and lead; forming the parts from the wiped sheets and assembling the same with the portions of copper alloys into an assembled product; submitting the assembled product to a soft fluxing with a flux of the type used in tin-lead soldering of copper members; and heating the same to the soldering temperature.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |