US3582704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of foil seals
Assignee: General Electric Co
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Filing: 1968-06-06
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Granted: 1971-06-01
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Expires: 1988-06-06
Abstract
Abstract Molybdenum foils for pinch sealing into quartz are etched using shields which protect selected welding areas at each end from the action of the electrolyte. Etching provides feathered edges all around but leaves thicker areas under the shields to which the inleads and electrodes are welded without any need for extra tabs to facilitate welding or to increase the current-carrying capacity. In a preferred foil-inlead construction, the inlead and electrode have spade ends coextensive with the thicker areas in the foils to which they are welded.
Inventors
- 👤 Elmer G Fridrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:01
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/24; H01J9/28; H01J5/00; H01J5/32; H01J5/38
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
84 words
An inlead-foil-electrode assembly for sealing into a vitreous envelope comprising a metal inlead, a thin metal foil and a metal electrode, said foil being etched all over and having feathered edges all around except for thicker areas at opposite ends tapering into the thickness of the foil adjoining it, said inlead and said electrode both having spade-shaped ends next to said foil, said thicker areas at the ends of said foil matching said spade-shaped ends and being substantially coextensive therewith and being welded thereto.
Claim 2
Dependent Claim
84 words
An inlead-foil-electrode assembly for sealing into a vitreous envelope comprising a metal inlead, a thin metal foil and a metal electrode, said foil being etched all over and having feathered edges all around except for thicker areas at opposite ends tapering into the thickness of the foil adjoining it, said inlead and said electrode both having spade-shaped ends next to said foil, said thicker areas at the ends of said foil matching said spade-shaped ends and being substantially coextensive therewith and being welded thereto.
Claim 3
Dependent Claim
34 words
An assembly as defined in claim 1 wherein said thicker areas project at the ends of the foil without foil sections at the shoulders which are unfeathered and incapable of bonding to vitreous material.
Claim 4
Dependent Claim
25 words
An assembly as defined in claim 1 wherein the inlead consists of refractory metal, the foil consists of molybdenum, and the electrode consists of tungsten.
Claim 5
Dependent Claim
18 words
An electric device comprising a vitreous envelope having an inlead-foil-electrode assembly as defined in claim 1 sealed therein.
Claim 6
Dependent Claim
64 words
An inlead-foil-conductor assembly for sealing into a vitreous envelope comprising a metal inlead, a thin metal foil and a metal inner conductor, said foil being etched all over and having feathered edges all around except for thicker unetched areas at opposite ends, said thicker areas tapering into the etched foil adjoining it, said inlead and said inner conductor being welded to said thicker areas.
Claim 7
Dependent Claim
64 words
An inlead-foil-conductor assembly for sealing into a vitreous envelope comprising a metal inlead, a thin metal foil and a metal inner conductor, said foil being etched all over and having feathered edges all around except for thicker unetched areas at opposite ends, said thicker areas tapering into the etched foil adjoining it, said inlead and said inner conductor being welded to said thicker areas.
Claim 8
Dependent Claim
34 words
An assembly as defined in claim 5 wherein said thicker areas project at the ends of the foil without foil sections at the shoulders which are unfeathered and incapable of bonding to vitreous material.
Claim 9
Dependent Claim
26 words
An assembly as defined in claim 1 wherein the inlead consists of refractory metal, the foil consists of molybdenum, and the inner conductor consists of tungsten.
Claim 10
Dependent Claim
18 words
An electric device comprising a vitreous envelope having an inlead-foil-conductor assembly as defined in claim 5 sealed therein.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |