Patent US4291216A successfully refreshed from Google Patents.
US4291216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for welding of noble metal foil
Assignee: Individual
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Filing: 1979-04-12
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Granted: 1981-09-22
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Expires: 1999-04-12
Abstract
Abstract A process for welding of noble metal foil includes successively piling a noble metal foil and a thin metal sheet having a high electrical resistance on a side of a metal plate having a high corrosion resistance and a high electrical conduction, mutually welding the foil, the sheet and the plate together and dissolving out only the thin metal thin sheet.
Inventors
- 👤 Kiyosumi Takayasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:27
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/16; B23K11/20; B23K11/002; B23K11/0026
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
A process for welding a noble metal foil having a thickness of not more than 10μ to a metal plate having a high corrosion resistance and a high electrical conduction, there additionally being a thin metal sheet having a high electrical resistance, the process comprising: piling on one another: the thin metal sheet, the noble metal foil and the metal plate with the noble metal foil being arranged between the plate and sheet; welding the sheet, the foil and the plate together by electric resistance welding to form a laminate; and dissolving out the thin metal sheet to leave the noble metal foil welded to the metal plate.
Claim 2
Dependent Claim
108 words
A process for welding a noble metal foil having a thickness of not more than 10μ to a metal plate having a high corrosion resistance and a high electrical conduction, there additionally being a thin metal sheet having a high electrical resistance, the process comprising: piling on one another: the thin metal sheet, the noble metal foil and the metal plate with the noble metal foil being arranged between the plate and sheet; welding the sheet, the foil and the plate together by electric resistance welding to form a laminate; and dissolving out the thin metal sheet to leave the noble metal foil welded to the metal plate.
Claim 3
Dependent Claim
21 words
The process as claimed in claim 1 in which said noble metal foil is one of platinum foil and gold foil.
Claim 4
Dependent Claim
17 words
The process as claimed in claim 1 in which said thin metal sheet is stainless steel sheet.
Claim 5
Dependent Claim
24 words
The process as claimed in claim 1 in which said metal plate is one of titanium plate, tantalum plate, niobium plate and zirconium plate.
Claim 6
Dependent Claim
16 words
The process as claimed in claim 1 in which said welding is performed by seam welding.
Claim 7
Dependent Claim
33 words
The process as claimed in claim 1 in which said dissolving is performed by treating the laminate with aqua regia having a concentration of hydrochloric acid to nitric acid of 10 to 4.
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) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |