Patent US3663777A successfully refreshed from Google Patents.
US3663777A
Expired / Lapsed
US
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Reed switch
Assignee: US Philips Corp
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Filing: 1970-08-21
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Granted: 1972-05-16
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Expires: 1990-08-21
Abstract
Abstract A switching device such as a reed switch having moving contacts whose outer contacting surface consists of an outer layer of metal such as ruthenium or rhodium having thickness of from 0.1 to 5.0 Mu m with an interrupted or non-interrupted underlayer of at least 1 percent by volume of non-metal.
Inventors
- 👤 Anthony Steinmetz
- 👤 Douwe Mindert De Boer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:00
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0201; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
42 words
A device according to claim 1 wherein the non-metal underlayer has thickness in the range of 0.001 to 1.0 Mu m from the group consisting of carbon, graphite, phosphorous, sulphur, silicon, and metal oxide, and the outer layer comprises ruthenium or rhodium.
Claim 2
Dependent Claim
51 words
A device according to claim 1 wherein the underlayer comprises a non-metal present in a finely divided form in a metal deposition having a melting point of less than 1,500* C., in a layer thickness of at least 0.1 Mu m, and that the outer layer consists of ruthenium or rhodium.
Claim 3
Dependent Claim
25 words
A device according to claim 1 wherein the non-metal is present in finely divided form in gold which is largely diffused into the basic material.
Claim 4
Dependent Claim
13 words
A device according to claim 1 wherein said underlayer is an uninterrupted layer.
Claim 5
Dependent Claim
13 words
A device according to claim 1 wherein said underlayer is an interrupted layer.
Claim 6
Dependent Claim
24 words
A device according to claim 1 wherein the non-metal is present in laminated form in gold which is largely diffused into the basic material.
Claim 7
Dependent Claim
66 words
In a reed switch including a sealed envelope with two moving contacts disposed therein, each contact comprising a base formed of magnetic nickel-iron having a contact surface formed of at least two layers, an outer exposed layer consisting of ruthenium or rhodium of thickness in the range of 0.1 to 5.0 Mu m, and an under layer between the base and outer layer formed of carbon.
References Cited (Backward Citations)
US2734979A
Cited
US2070321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |