Patent US3914639A successfully refreshed from Google Patents.
US3914639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater unit for cathode
Assignee: Individual
•
Filing: 1974-04-05
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Granted: 1975-10-21
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Expires: 1994-04-05
Abstract
Abstract Presented is a heater unit adapted for use in conjunction with a cathode.
Inventors
- 👤 Anthony J Barraco
- 👤 Martin E Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:03
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/22
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
72 words
An electrically energizable cathode heater unit comprising: a. an elongated electrically resistive filament formed from a sheet of suitable material to provide a plurality of serially connected turns arranged in serpentine fashion; and b. a pair of support legs formed from the same sheet of suitable material as the filament and integral with selected portions of said filament and adapted to function also as electrically conductive terminal leads for said heater unit.
Claim 2
Dependent Claim
72 words
An electrically energizable cathode heater unit comprising: a. an elongated electrically resistive filament formed from a sheet of suitable material to provide a plurality of serially connected turns arranged in serpentine fashion; and b. a pair of support legs formed from the same sheet of suitable material as the filament and integral with selected portions of said filament and adapted to function also as electrically conductive terminal leads for said heater unit.
Claim 3
Dependent Claim
18 words
The combination according to claim 1, in which said serially connected turns all lie in a common plane.
Claim 4
Dependent Claim
26 words
the combination according to claim 1, in which a third support leg is provided integral with said filament intermediate said first mentioned pair of support legs.
Claim 5
Dependent Claim
29 words
The combination according to claim 1, in which said filament is fabricated from a material selected from the group consisting of tungsten, molybdenum, tantalum, iridium, rhenium, and alloys thereof.
Claim 6
Dependent Claim
70 words
The combination according to claim 1, in which each of said legs is integral at one end with a selected portion of said filament and extends radially outwardly therefrom in the same plane, and integral pad means are provided on the outer end of each of said support legs, each said pad having a transverse dimension in relation to said leg substantially greater than the transverse dimension of the leg.
Claim 7
Dependent Claim
69 words
The cimbination according to claim 1, in which three such support legs are provided connected to said filament at selected intervals therealong and extending radially away therefrom in the same plane, and a mounting plate circumscribing said heater unit and integrally connected to the end of each of said support legs at its end remote from said heater unit and lying in the same plane as said support legs.
Claim 8
Dependent Claim
45 words
The combination according to claim 1, in which said filament is a ribbon generally rectangular in configuration, having a thickness of approximately 0.001 inch and a width of approximately 0.0015 inch, the spacing between turns of said filament being in the order of 0.002 inch.
Claim 9
Dependent Claim
33 words
The combination according to claim 1, in which said material constitutes an alloy of tungsten and rhenium, the quantity of rhenium to tungsten being in the range of 3% to 25% by weight.
Claim 10
Dependent Claim
23 words
The combination according to claim 1, in which said electrically resistive material is formed from a metal having a melting point above 1600*C.
Claim 11
Dependent Claim
14 words
The combination according to claim 1, in which said electrically resistive material is molybdenum.
Claim 12
Dependent Claim
44 words
The combination according to claim 1, in which said pair of support legs are integral with opposite end portions of said filament, and an anchor tab is provided between the extreme end of the filament and the associated end portion of the support leg.
Claim 13
Dependent Claim
17 words
The combination according to claim 1, in which said resistive filament after formation is rectangular in cross-section.
Claim 14
Dependent Claim
24 words
The combination according to claim 1, in which said resistive filament after formation is generally rectangular in cross-section and is provided with chamfered edges.
References Cited (Backward Citations)
US3748522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |