US3612822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evaporation filament assembly
Assignee: GTE Sylvania Inc
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Filing: 1969-06-25
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Granted: 1971-10-12
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Expires: 1989-06-25
Abstract
Abstract An evaporation filament for the vapor deposition of metallic films consists of a stabilized tungsten coil having parallel legs. A ceramic support is attached to the legs and prevents distortion of the coil during operation thereof.
Inventors
- 👤 Ronald E Edin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:58
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
An evaporation filament assembly comprising a stabilized tungsten coil having substantially parallel legs protruding therefrom and a ceramic support rigidly attached to said legs, said coil being wound from stranded wire and being a reverse helix coil having a diametrically positioned crossover wire at the apex thereof, said crossover wire serving as the bottom of the container defined by the coil, the legs of the filament joining the coil being bent at their juncture and protruding back substantially parallel to the coil body.
Claim 2
Dependent Claim
83 words
An evaporation filament assembly comprising a stabilized tungsten coil having substantially parallel legs protruding therefrom and a ceramic support rigidly attached to said legs, said coil being wound from stranded wire and being a reverse helix coil having a diametrically positioned crossover wire at the apex thereof, said crossover wire serving as the bottom of the container defined by the coil, the legs of the filament joining the coil being bent at their juncture and protruding back substantially parallel to the coil body.
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |