US3723790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical lamp or tube comprising copper coated nickel-iron alloy electrical current conductors and a glass enclosure
Assignee: Corning Glass Works
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Filing: 1971-02-01
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Granted: 1973-03-27
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Expires: 1991-02-01
Abstract
Abstract Electrical articles, including electrical lamps and tubes, have dumet electrical current conductors and a glass enclosure sealed to the conductors. The glass enclosure may be composed entirely of a Na2O-Li2O-K2O-BaO-Al2O3-SiO2 electrical sealing glass, or may be composed of a soda-lime glass envelope joined to the conductors with an intermediate component of the sealing glass.
Inventors
- 👤 W Dumbaugh
- 👤 J Malmendier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:40
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/087; C; C03; C03C; C03C27/00; C03C27/02; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/089; C03C3/102
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
19 words
An electrical article in accordance with claim 1 wherein the glass enclosure consists entirely of said electrical sealing glass.
Claim 2
Dependent Claim
40 words
An electrical article in accordance with claim 1 wherein the glass enclosure consists of a soda-lime-silica type glass envelope and a stem portion composed of the electrical sealing glass, the latter being sealed intermediate the envelope and the electrical conductors.
Claim 3
Dependent Claim
54 words
An electrical article in accordance with claim 1 wherein the electrical sealing glass is free of lead oxide (PbO) and consists essentially of 64-71% SiO2, 1.5-4.0% Al2O3, 0-1.5% B2O3, the total Al2O3 + B2O3 being 1.5-4.0%, 1.5-3.0% Li2O, 1.5-3.5% Na2O, 9-12% K2O, the total alkali metal oxide content being 15-18 percent, and 12-17% BaO.
Claim 4
Dependent Claim
56 words
An electrical article in accordance with claim 1 wherein the electrical sealing glass consists essentially of 63-68% SiO2, 1.5-4.0% Al2O3, 0-1.5% B2O3, the total Al2O3 + B2O3 being 1.5-4.0%, 1.5-3.0% Li2O, 1.5-3.5% Na2O, 9-12% K2O, the total alkali metal oxide being 14-17%, 7-17% BaO, and up to 8% PbO, the total BaO + PbO being 12-19%.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |