US3639722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for joining wires to sheets of refractory materials
Assignee: General Electric Co
•
Filing: 1970-06-17
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Granted: 1972-02-01
•
Expires: 1990-06-17
Abstract
Abstract A tungsten reflector for a regenerative lamp is secured to a tungsten support rod by cross wire welding a molybdenum wire to the support rod and inserting the free end of the wire into an opening in the sheet and finally arc spot welding the free end of the wire to the side of the sheet facing away from the support rod.
Inventors
- 👤 Gasper Pagnotta
- 👤 Allan J Kiesler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:18
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
The process of claim 1 in which the support wire and reflector are made of tungsten and the joining wire is molybdenum, and the spot-welding operation is conducted with a tungsten electrode and an inert-gas shield to prevent oxidation of the molybdenum joining wire.
Claim 2
Dependent Claim
36 words
The process of claim 2 in which the end of the molybdenum joining wire extending through the opening in the tungsten reflector is melted during the spot-welding operation to form an annular seal within the reflector.
References Cited (Backward Citations)
US1093197A
Cited
US2979600A
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US3070723A
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US3222567A
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US3526746A
Cited
US3441772A
Cited
US3539762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |