US3668355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reed material for sealed contact application
Assignee: Nortel Networks Ltd
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Filing: 1971-01-27
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Granted: 1972-06-06
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Expires: 1991-01-27
Abstract
Abstract A reed for use in a reed-type switch comprising a body of magnetic material having a contacting surface essentially made up of a precious metal with some of the body material diffused therein, and an interface layer of an alloy of the precious metal and the body material between the body of magnetic material and the precious metal layer. The magnetic material is a glasscompatible nickel-iron alloy containing from about 0.125 to about 0.250 manganese by weight percent and having a resistivity not greater than about 225 ohms per circular mil foot.
Inventors
- 👤 David Campbell
- 👤 Real Oscar Chamberland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:08
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0201
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
60 words
A reed, as defined in claim 1, in which the magnetic material contains from about 51.0 to about 51.5 nickel, from about 0.1 to about 0.3 manganese, a maximum of 0.015 carbon, a maximum of 0.1 cobalt plus silicon, a maximum of 0.005 chromium, a maximum of 0.005 sulphur, not more than traces of other metalS, and the remainder iron.
Claim 2
Dependent Claim
58 words
A reed, as defined in claim 1 in which the contacting surface has a thin external layer of an alloy of gold and silver and an appreciably thicker layer of an alloy of gold, silver and the magnetic material, and the interface layer is an appreciably thicker layer of an alloy of gold, silver and the magnetic material.
Claim 3
Dependent Claim
159 words
A reed switch comprising a hermetically sealed cylindrical tube having a chemically inert gas therein, a pair of reeds of magnetic material extending within said tube and each defining a contacting surface disposed in overlapping relationship to one another in said tube, each said reed having a portion extending through and sealed in a respective end of said tube, said portion having a temperature coefficient of expansion equal to that of glass and providing connection to said reeds outside said tube, said contacting surface being essentially made up of a precious metal with some of the body material diffused therein, and an interface layer of an alloy of the precious metal and the body material between the body of magnetic material and the precious metal layer, said magnetic material being a glass-compatible nickel-iron alloy containing from about 0.125 to about 0.0250 manganese by weight percent and having a resistivity not greater than about 225 ohms per circular mil foot.
Claim 4
Dependent Claim
61 words
A reed switch as defined in claim 4 in which the magnetic material contains from about 51.0 to about 51.5 nickel, from about 0.1 to about 0.3 manganese, a maximum of 0.015 carbon, a maximum of 0.1 cobalt plus silicon, a maximum of 0.005 chromium, a maximum of 0.005 sulphur, not more than traces of other metals, and the remainder iron.
Claim 5
Dependent Claim
59 words
A reed switch as defined in claim 4 in which the contaCting surface has a thin external layer of an alloy of gold and silver and an appreciably thicker layer of an alloy of gold, silver and the magnetic material, and the interface layer is an appreciably thicker layer of an alloy of gold, silver, and the magnetic material.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |