US3694899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for brazing parts of aluminium and aluminium alloys
Assignee: Chausson Usines SA
•
Filing: 1970-10-07
•
Granted: 1972-10-03
•
Expires: 1990-10-07
Abstract
Abstract Process in which the parts to be brazed are dipped in an acidic or alkaline aqueous bath containing further a metallic salt or oxide thereof until the aluminum oxide is replaced by a metallic coating. The parts are then removed from the bath, then rinsed and dried to be assembled by brazing.
Inventors
- 👤 Andre Chartet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:35
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14; C23G1/22; B; B23; B23K; B23K35/00; B23K35/001; B23K35/002; C23G1/02; C23G1/12; C23G1/125
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
29 words
The method of claim 1 in which the metal compound of the bath is selected from the group consisting of zinc oxide, zinc sulfate, zinc fluoborate, and tin chloride.
Claim 2
Dependent Claim
64 words
The method of claim 1 in which said articles are immersed in an acidic aqueous bath containing per liter of solution 1.5 percent by weight of hydrofluoric acid and 750g of zinc sulfate, said bath being maintained at a temperature of About 25* C. and said articles being maintained immersed in said bath for a period of from about one-half minute to 5 minutes.
Claim 3
Dependent Claim
62 words
The method of claim 1 in which said articles are immersed in an alkaline aqueous bath containing, per liter of water, 300g soda, 75g zinc oxide, 80g sodium cyanide, and 3g copper cyanide, said bath being maintained at a temperature of about 25* C. and said articles maintained immersed therein for a period of from about one-half minute to about 5 minutes.
Claim 4
Dependent Claim
62 words
The method of claim 1 in which the step of fluxing includes hot spraying a powdered flux on said articles, whereby said flux is adhered to said article, said metal coating being zinc metal, said flux containing zinc oxide, said zinc metal compensating for any portion of the zinc oxide contained in said flux and in part destroyed by said hot spraying.
Claim 5
Dependent Claim
32 words
The method of claim 1 in which the step of fluxing includes immersing the articles in a flux bath which is either in a molten state or which is an aqueous suspension.
Claim 6
Dependent Claim
66 words
Method as set forth in claim 1, wherein an acidic aqueous bath is prepared said bath containing for each liter of water : 150 g of zinc fluoborate, 0.5 g nickel fluoborate and 20 g of ammonium chloride, and said articles are dipped for a period of time from half a minute to five minutes, the bath being maintained at a temperature of about 25* C.
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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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |