Patent US3889098A successfully refreshed from Google Patents.
US3889098A
Expired / Lapsed
US
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Switching device having contacts of two or more layers
Assignee: US Philips Corp
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Filing: 1974-05-03
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Granted: 1975-06-10
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Expires: 1994-05-03
Abstract
Abstract A switching device having contacts with a coating consisting of at least two layers in which the inner layer having a thickness of at least 0.5 Mu m consists of metal having a melting point of more than 1800*C and provided with a layer having a thickness of 0.01 - 1 Mu m consisting of a metal having a melting point of less than 500*C and preferably provided with a layer of noble metal having a melting point of more than 1800*C with a thickness of 0.1 - 5 Mu m.
Inventors
- 👤 Anthony Steinmetz
- 👤 Hidde Walstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:07
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0201
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
84 words
A SWITCHING DEVICE HAVING MOVING CONTACTS OF WHICH AT LEAST THE CONTACT SURFACE IS CLAD WITH A CONTACT COATING WHICH CONSISTS OF AT LEAST TWO LAYERS, CHARACTERIZED IN THAT THE INNER LAYER HAVING A THICKNESS OF AT LEAST 0.5 / UM OF A METAL HAVING A MELTING POINT OF MORE THAN 1800*C ON WHICH AN INTERRUPTED OR UNINTERRUPTED LAYER HAVING A THICKNESS OF 0.01-1/UM IS PRESENT WHICH LAYER CONSISTS OF A METAL OR A METAL ALLOY HAVING A MELTING POINT OF LESS THAN 500*C.
Claim 2
Dependent Claim
84 words
A SWITCHING DEVICE HAVING MOVING CONTACTS OF WHICH AT LEAST THE CONTACT SURFACE IS CLAD WITH A CONTACT COATING WHICH CONSISTS OF AT LEAST TWO LAYERS, CHARACTERIZED IN THAT THE INNER LAYER HAVING A THICKNESS OF AT LEAST 0.5 / UM OF A METAL HAVING A MELTING POINT OF MORE THAN 1800*C ON WHICH AN INTERRUPTED OR UNINTERRUPTED LAYER HAVING A THICKNESS OF 0.01-1/UM IS PRESENT WHICH LAYER CONSISTS OF A METAL OR A METAL ALLOY HAVING A MELTING POINT OF LESS THAN 500*C.
Claim 3
Dependent Claim
52 words
A switching device as claimed in claim 1, characterized in that a layer having a thickness of 0.1 -5 Mu m 5 Mu consisting of a noble metal having a melting point of more than 1800*C is present on the layer consisting of metal having a melting point of less than 500*C.
References Cited (Backward Citations)
US3663777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |