Patent US2786162A successfully refreshed from Google Patents.
US3949335A
Expired / Lapsed
US
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Reed switch construction
Assignee: Corning Glass Works
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Filing: 1975-04-21
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Granted: 1976-04-06
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Expires: 1995-04-21
Abstract
Abstract A reed switch construction is described embodying magnetic metal reeds and an improved glass envelope. The envelope is drawn from an infrared absorbing glass having a steep viscosity curve which permits forming a seal between the metal reeds and the glass envelope with infrared heating at a temperature sufficiently low to avoid damaging the reeds.
Inventors
- 👤 David W. Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:00
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C4/00; C03C4/08; C03C4/082; H; H01; H01H; H01H1/00; H01H1/02; H01H1/0201; H01H51/00; H01H51/28; H01H51/282
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
A reed switch embodying reeds composed of a magnetic, cobalt-iron-vanadium alloy having a thermal coefficient of expansion within the range of 95-105 × 10 - 7 (25°-300°C.), and a tubular glass envelope having an expansion coefficient matching that of the alloy below the glass setting point and being hermetically sealed to the reeds, the envelope being drawn from a glass having a working temperature below 950°C. and being composed essentially of, in percent by weight as calculated from the glass batch on an oxide bases, 46-54% SiO 2 , 2-8% B 2 O 3 , 0-4% Li 2 O, 0-12% Na 2 O, 0-10% K 2 O, the total content of Li 2 O + Na 2 O + K 2 O being 8-13%, 0-6% CaO, 13-20% BaO, 5-10% ZnO, the total content of CaO + BaO + ZnO being 25-35%, 0-2% TiO 2 , 0-4% ZrO 2 , and 0.5-5.0% Fe 2 O 3 .
Claim 2
Dependent Claim
156 words
A reed switch embodying reeds composed of a magnetic, cobalt-iron-vanadium alloy having a thermal coefficient of expansion within the range of 95-105 × 10 - 7 (25°-300°C.), and a tubular glass envelope having an expansion coefficient matching that of the alloy below the glass setting point and being hermetically sealed to the reeds, the envelope being drawn from a glass having a working temperature below 950°C. and being composed essentially of, in percent by weight as calculated from the glass batch on an oxide bases, 46-54% SiO 2 , 2-8% B 2 O 3 , 0-4% Li 2 O, 0-12% Na 2 O, 0-10% K 2 O, the total content of Li 2 O + Na 2 O + K 2 O being 8-13%, 0-6% CaO, 13-20% BaO, 5-10% ZnO, the total content of CaO + BaO + ZnO being 25-35%, 0-2% TiO 2 , 0-4% ZrO 2 , and 0.5-5.0% Fe 2 O 3 .
Claim 3
Dependent Claim
56 words
A reed switch in accordance with claim 1 wherein the reeds are composed of an alloy containing substantially equal parts of cobalt and iron and about 4% vanadium and the glass sealed thereto has a strain point of 470°-510°C. and a coefficient of thermal expansion in the range of 80-90 × 10 - 7 /°C. (0°-300°C.).
Claim 4
Dependent Claim
54 words
A reed switch in accordance with claim 2 wherein the glass consists of 48-50% SiO 2 , 4-5% B 2 O 3 , 2-3% Li 2 O, 1-3% Na 2 O, 6-9% K 2 O, 5-6% CaO, 14-17% BaO, 7-9% ZnO, 3-5% TiO 2 + ZrO 2 and 2-4% Fe 2 O 3 .
Claim 5
Dependent Claim
21 words
A reed switch in accordance with claim 1 wherein the glass working temperature is in the range of 850°C. to 900°C.
Claim 6
Dependent Claim
28 words
A reed switch in accordance with claim 4 wherein the temperature interval between the working temperature and the strain point of the glass is not over about 400°C.
References Cited (Backward Citations)
US3808154A
Cited
US3814612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |