US4340845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized cathode assembly for arc light source
Assignee: LEMAN LABS Inc
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Filing: 1980-07-16
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Granted: 1982-07-20
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Expires: 2000-07-16
Abstract
Abstract A stabilized cathode assembly for an arc light source is disclosed wherein an unattached end of a length of electrically conducting braid serving as a cathode is held in close proximity to the anode of the source to establish an arc path between the braid end and the anode. Support means are disclosed which function to advance and withdraw the braid to initiate the arc. Application of the assembly in a spectrometer sample excitation device is further disclosed.
Inventors
- 👤 Karl J. Hildebrand
- 👤 John Leeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:26
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
In an arc light source comprised of an anode, a cathode, and a direct current power supply connected between said anode and said cathode, a stabilized cathode assembly comprising in combination: a. a cathode comprising a length of electrically conducting braid consisting of a bundle of interwoven electrically conducting fibers, said braid having an unattached end transverse the longitudinal axis of said braid; and b. cathode support means arranged to position said unattached end of said braid in close proximity to said anode whereby an arc path is established between said end and said anode.
Claim 2
Dependent Claim
95 words
In an arc light source comprised of an anode, a cathode, and a direct current power supply connected between said anode and said cathode, a stabilized cathode assembly comprising in combination: a. a cathode comprising a length of electrically conducting braid consisting of a bundle of interwoven electrically conducting fibers, said braid having an unattached end transverse the longitudinal axis of said braid; and b. cathode support means arranged to position said unattached end of said braid in close proximity to said anode whereby an arc path is established between said end and said anode.
Claim 3
Dependent Claim
42 words
The apparatus of claim 1 wherein said cathode support means further comprises means to advance said unattached end into contact with said anode and to subsequently withdraw said end from said anode to initiate an arc between said anode and said cathode.
Claim 4
Dependent Claim
38 words
The apparatus of claim 1 wherein said anode comprises a length of electrically conducting braid consisting of a bundle of interwoven, electrically conducting fibers, the longitudinal axis of said anode positioned transverse the longitudinal axis of said cathode.
Claim 5
Dependent Claim
14 words
The apparatus of claim 1 or 3 wherein said fibers are comprised of graphite.
Claim 6
Dependent Claim
109 words
A sample excitation device for spectrometers comprising in combination: a. an anode; b. a cathode comprising a length of electrically conducting braid consisting of a bundle of interwoven electrically conducting fibers, said braid having a unattached end transverse the longitudinal axis of said braid; c. cathode support means arranged to position said unattached end of said braid in close proximity to said anode, whereby an arc path is established between said end and said anode; d. direct current electrical power supply means connected to said anode and said cathode; and e. gas supply means for introducing a stream of inert gas about said cathode and into said arc path.
Claim 7
Dependent Claim
109 words
A sample excitation device for spectrometers comprising in combination: a. an anode; b. a cathode comprising a length of electrically conducting braid consisting of a bundle of interwoven electrically conducting fibers, said braid having a unattached end transverse the longitudinal axis of said braid; c. cathode support means arranged to position said unattached end of said braid in close proximity to said anode, whereby an arc path is established between said end and said anode; d. direct current electrical power supply means connected to said anode and said cathode; and e. gas supply means for introducing a stream of inert gas about said cathode and into said arc path.
Claim 8
Dependent Claim
42 words
The apparatus of claim 5 wherein said cathode support means further comprises means to advance said unattached end into contact with said anode and to subsequently withdraw said end from said anode to initiate an arc between said anode and said cathode.
Claim 9
Dependent Claim
11 words
The apparatus of claim 5 wherein said anode comprises said sample.
Claim 10
Dependent Claim
14 words
The apparatus of claim 5 wherein said anode is arranged to support said sample.
Claim 11
Dependent Claim
16 words
The apparatus of claim 8 wherein said anode comprises a cup arranged to hold said sample.
Claim 12
Dependent Claim
38 words
The apparatus of claim 8 wherein said anode comprises a length of electrically conducting braid consisting of a bundle of interwoven, electrically conducting fibers, the longitudinal axis of said braid positioned transverse the longitudinal axis of said cathode.
Claim 13
Dependent Claim
44 words
The apparatus of claim 8 wherein said anode comprises a pair of closely spaced, parallel lengths of electrically conducting braid each consisting of a bundle of interwoven electrically conducting fibers, the longitudinal axis of said braids positioned transverse the longitudinal axis of said cathode.
Claim 14
Independent Claim
14 words
The apparatus of claims 10 or 11 wherein said fibers are comprised of graphite.
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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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |