US4553022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Effusion cell assembly
Assignee: Applied Biosystems Inc
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Filing: 1984-06-04
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Granted: 1985-11-12
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Expires: 2004-06-04
Abstract
Abstract An effusion cell assembly includes a self-supporting element disposed within a housing member. The self-supporting element provides efficient heat transfer to a crucible positioned therein and permits operation at relatively lower filament tempertures.
Inventors
- 👤 Paul Colombo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:21
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/28; C30; C30B; C30B23/00; C30B23/02; C30B23/06; C30B23/066
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
86 words
An ultra-high vacuum effusion cell for operating at a temperature of about 1500° C. comprising, in combination: a self supporting high emissivity heater filament having a serpentine path which is formed in a generally cylindrical configuration, said filament providing a substantially uniform radiation therefrom when electrical current passes therethrough; a support ridge projecting inwardly of said heater filament and forming a support ring; and a crucible supported by said support ring and disposed radially inward of said heater filament to hold a material to be heated.
Claim 2
Dependent Claim
86 words
An ultra-high vacuum effusion cell for operating at a temperature of about 1500° C. comprising, in combination: a self supporting high emissivity heater filament having a serpentine path which is formed in a generally cylindrical configuration, said filament providing a substantially uniform radiation therefrom when electrical current passes therethrough; a support ridge projecting inwardly of said heater filament and forming a support ring; and a crucible supported by said support ring and disposed radially inward of said heater filament to hold a material to be heated.
Claim 3
Dependent Claim
13 words
The assembly of claim 1 wherein said heater filament is made of graphite.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |