US4235649A
Expired / Lapsed
US
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Flux for brazing
Assignee: Mitsubishi Electric Corp
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Filing: 1979-07-12
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Granted: 1980-11-25
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Expires: 1999-07-12
Abstract
Abstract A fluoride flux for silver brazing comprises an iron powder, a cobalt powder, a nickel powder or a copper powder which has an average diameter of 1-100 mu in a flux having a main component such as an alkali metal fluoride, an alkali fluoroborate, an alkali metal chloride, an alkali metal borate, etc..
Inventors
- 👤 Minoru Inamura
- 👤 Noboru Takeuchi
- 👤 Kazuhiro Inukai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:45
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/3601; B23K35/3603; B23K35/3606
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
58 words
A flux for brazing which consists essentially of a main component selected from the group consisting of boric acid, borax, alkali metal fluorides, alkali metal borofluorides and alkali metal chlorides; and 0.5 to 10 wt. % of a metal having an average particle diameter of 0.1 to 500μ, and water in an amount sufficient to form a paste.
Claim 2
Dependent Claim
58 words
A flux for brazing which consists essentially of a main component selected from the group consisting of boric acid, borax, alkali metal fluorides, alkali metal borofluorides and alkali metal chlorides; and 0.5 to 10 wt. % of a metal having an average particle diameter of 0.1 to 500μ, and water in an amount sufficient to form a paste.
Claim 3
Dependent Claim
22 words
The flux according to claim 1, wherein the powdery metal is selected from the group consisting of iron, cobalt, nickel and copper.
Claim 4
Dependent Claim
21 words
The flux according to claim 1, wherein the main component is present in a range of 30 to 95 wt. %.
Claim 5
Dependent Claim
42 words
The flux according to claim 1, wherein the main component is selected from the group consisting of B 2 O 3 , Na 2 B 2 O 7 , NaF, KF, LiF, NaBF 4 , LiBF 4 , KCl, NaCl and LiCl.
Claim 6
Dependent Claim
23 words
The flux according to claim 1, wherein the main component is selected from the group consisting of alkali metal fluorides and alkali-metal borofluorides.
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) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |