Patent US379423A successfully refreshed from Google Patents.
US3676730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal arrangements for lamps
Assignee: GTE Sylvania Inc
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Filing: 1969-12-29
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Granted: 1972-07-11
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Expires: 1989-12-29
Abstract
Abstract Lead-in wires of lamps are disposed in a vitreous silica envelope through the use of a graded seal in which two abutting segments of refractory metal wires are coated with a cermet formed of an admixture of powdered refractory metal and vitreous silica. These lead-in wires are disposed in an aperture in a wafer which, in turn, is sealed to a vitreous silica envelope.
Inventors
- 👤 Frederick A Loughridge
- 👤 Wilfrid G Matheson
- 👤 Edmund M Passmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:22
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/32; H01J5/40
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
The lamp according to claim 1 wherein the lead-in wires are formed of tungsten or molybdenum.
Claim 2
Dependent Claim
24 words
The lamp according to claim 1 wherein said wafer has an aperture disposed therein for the location of said abutment of said lead-in wires.
Claim 3
Dependent Claim
26 words
The lamp according to claim 3 wherein the aperture is conical in shape, the widest portion of the aperture facing into the interior of the envelope.
Claim 4
Dependent Claim
27 words
The lamp according to claim 4 wherein the inner lead-in wire is tungsten and the outer lead-in wire is molybdenum and the powdered refractory metal is tungsten.
Claim 5
Dependent Claim
18 words
The lamp according to claim 4 wherein the inner lead-in wire is welded to the outer lead-in wire.
Claim 6
Dependent Claim
21 words
The lamp according to claim 5 wherein the powdered refractory metal has a particle size of less than about 200 mesh.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |