Patent US4139140A successfully refreshed from Google Patents.
US4139140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing an electrical contact element
Assignee: G RAU GmbH and Co KG
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Filing: 1977-08-19
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Granted: 1979-02-13
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Expires: 1997-08-19
Abstract
Abstract A contact element is produced by sonically welding one or more contact pieces onto a carrier, an intermediate layer, for example of aluminium foil, being interposed between the contact piece and the carrier prior to such welding in order to assist in the welding of the contact pieces made of material which would otherwise be difficult to weld. Typical frequencies of sonic welding lie in the range between 20 kHz and 50 Hz.
Inventors
- 👤 Dieter Stockel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:00
CPC Classifications
H; H01; H01H; H01H11/00; H01H11/04; H01H11/041; H01H11/045; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T29/49208
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
A method for producing a contact element of the type including at least one contact piece joined to a carrier, said method comprising: positioning a layer of cold-weldable metal powder between said contact piece and said carrier; and applying pressure between said contact piece and said carrier while applying thereto sonic welding at a frequency of approximately from 50 Hz to 20 kHz, thereby welding said contact piece to said carrier with said metal powder therebetween as an intermediate layer.
Claim 2
Independent Claim
80 words
A method for producing a contact element of the type including at least one contact piece joined to a carrier, said method comprising: positioning a layer of cold-weldable metal powder between said contact piece and said carrier; and applying pressure between said contact piece and said carrier while applying thereto sonic welding at a frequency of approximately from 50 Hz to 20 kHz, thereby welding said contact piece to said carrier with said metal powder therebetween as an intermediate layer.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1, wherein said metal powder includes a binding agent.
Claim 4
Dependent Claim
26 words
A method as claimed in claim 1, wherein the thickness of said layer of metal powder before the sonic welding operation is less than 100 μm.
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) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |