US3732454A
Expired / Lapsed
US
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Glow discharge tube for atomic light-absorption analysis
Assignee: Hitachi Ltd
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Filing: 1971-11-24
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Granted: 1973-05-08
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Expires: 1991-11-24
Abstract
Abstract A glow discharge tube for atomic light-absorption analysis in which a hollow cathode for producing atomic light-absorption lines comprises a molded article of fine powder containing at least one metal element which produces the atomic lightabsorption lines, the article being molded without heating it whereby the dislocation of atomic distance remains in the crystalline lattice to improve the sputtering rate of the metal atom so that the density of metal atoms in the hollow of the hollow cathode is increased to enhance the light intensity of the atomic light-absorption lines.
Inventors
- 👤 H Okagaki
- 👤 Y Arai
- 👤 S Tomita
- 👤 A Hosoya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:24
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/066; H01J17/38; H01J17/40; H01J2893/00; H01J2893/0064; H01J2893/0065; H01J2893/0066; H01J2893/0067
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
105 words
A glow discharge tube for atomic light-absorption analysis which comprises: an envelope confining an inert gas atmosphere and having a window transparent to atomic light-absorption lines; a cathode for glow discharge having a hollow; an anode adjacent to said hollow of said cathode; a cathode lead connected to said cathode; and an anode lead connected to said anode, each of said leads connected to a power source, wherein said cathode is composed of a molded body comprising a powder of at least one metal which serves as an element for producing said atomic lightabsorption lines, the particles of said powder being bonded together by sticking.
Claim 2
Dependent Claim
105 words
A glow discharge tube for atomic light-absorption analysis which comprises: an envelope confining an inert gas atmosphere and having a window transparent to atomic light-absorption lines; a cathode for glow discharge having a hollow; an anode adjacent to said hollow of said cathode; a cathode lead connected to said cathode; and an anode lead connected to said anode, each of said leads connected to a power source, wherein said cathode is composed of a molded body comprising a powder of at least one metal which serves as an element for producing said atomic lightabsorption lines, the particles of said powder being bonded together by sticking.
Claim 3
Dependent Claim
23 words
A glow discharge tube according to claim 1, wherein said cathode comprises a cylindrically shaped wall made of said molded body of powder.
Claim 4
Dependent Claim
24 words
A glow discharge tube according to claim 2, wherein said cathode further includes an outer reinforcing casing for mechanically reinforcing said cylindrically shaped wall.
Claim 5
Dependent Claim
27 words
A glow discharge tube according to claim 3, wherein said casing and said wall each have respective interlocking grooves and ridges for improving the close adhesiveness therebetween.
Claim 6
Dependent Claim
132 words
A glow discharge tube for atomic light-absorption analysis wHich comprises: an envelope confining an inert gas atmosphere and having a window transparent to atomic light-absorption lines; a cathode for glow discharge having a hollow; an anode adjacent to said hollow of said cathode; a cathode lead connected to said cathode; and an anode lead connected to said anode, each of said leads being connected to a power source, in which at least an inner periphery of said cathode is composed of a molded body comprising fine powder of at least one metal having a melting point higher than the operating temperature of said cathode, particles of said powder being bonded together by sticking, whereby atomic dislocation remains in the crystalline lattice of said particles to increase the sputtering efficiency of said metal.
Claim 7
Dependent Claim
132 words
A glow discharge tube for atomic light-absorption analysis wHich comprises: an envelope confining an inert gas atmosphere and having a window transparent to atomic light-absorption lines; a cathode for glow discharge having a hollow; an anode adjacent to said hollow of said cathode; a cathode lead connected to said cathode; and an anode lead connected to said anode, each of said leads being connected to a power source, in which at least an inner periphery of said cathode is composed of a molded body comprising fine powder of at least one metal having a melting point higher than the operating temperature of said cathode, particles of said powder being bonded together by sticking, whereby atomic dislocation remains in the crystalline lattice of said particles to increase the sputtering efficiency of said metal.
Claim 8
Dependent Claim
128 words
A glow discharge tube for atomic light-absorption analysis which comprises: an envelope confining an inert gas atmosphere and having a window transparent to atomic light-absorption lines, a cathode for glow discharge having a hollow, an anode adjacent to said cathode, a cathode lead connected to said cathode, and an anode lead connected to said anode, each of said leads being connected to a power source, in which at least an inner periphery of said cathode is composed of a molded body of fine powder containing at least one metal having a melting point higher than 660 *C, the particles of said metal being connected by sticking, whereby dislocation of atomic distance which is imparted by grinding and compressing said powder remains in the crystalline lattice of said particles.
Claim 9
Dependent Claim
128 words
A glow discharge tube for atomic light-absorption analysis which comprises: an envelope confining an inert gas atmosphere and having a window transparent to atomic light-absorption lines, a cathode for glow discharge having a hollow, an anode adjacent to said cathode, a cathode lead connected to said cathode, and an anode lead connected to said anode, each of said leads being connected to a power source, in which at least an inner periphery of said cathode is composed of a molded body of fine powder containing at least one metal having a melting point higher than 660 *C, the particles of said metal being connected by sticking, whereby dislocation of atomic distance which is imparted by grinding and compressing said powder remains in the crystalline lattice of said particles.
Claim 10
Dependent Claim
46 words
A glow discharge tube according to claim 6, in which said powder comprises at least one higher melting point metal having a melting point higher than that of silver and at least one lower melting point metal having a melting point lower than that of antimony.
Claim 11
Dependent Claim
20 words
A glow discharge tube according to claim 6, in which said particles have a particle size smaller than 150 microns.
Claim 12
Dependent Claim
54 words
A glow discharge tube according to claim 6, in which said powder comprises at least two metals each having a melting point higher than that of silver, each of said metals being mixed in such a ratio that the light intensity with respect to each of said metals is substantially equal to one another.
Claim 13
Dependent Claim
146 words
A glow discharge tube for atomic light-absorption analysis which comprises: an envelope confining an inert gas atmosphere and having a window transparent to atomic light-absorption lines, a cathode for generating said atomic light-absorption lines having a hollow in which a glow discharge takes place, an anode adjacent to said cathode, a lead connected to said cathode, a lead connected to said anode, each of leads being connected to a power source, in which at least the inner periphery of said cathode is composed of a molded body of powder having a particle size smaller than about 150 microns and containing at least one elemental metal having a melting point higher than that of aluminum, said body being formed by compression without heating into a desired shape, whereby dislocation of atomic distance remains in a crystalline lattice of said metal to render said atoms active to sputtering.
Claim 14
Dependent Claim
146 words
A glow discharge tube for atomic light-absorption analysis which comprises: an envelope confining an inert gas atmosphere and having a window transparent to atomic light-absorption lines, a cathode for generating said atomic light-absorption lines having a hollow in which a glow discharge takes place, an anode adjacent to said cathode, a lead connected to said cathode, a lead connected to said anode, each of leads being connected to a power source, in which at least the inner periphery of said cathode is composed of a molded body of powder having a particle size smaller than about 150 microns and containing at least one elemental metal having a melting point higher than that of aluminum, said body being formed by compression without heating into a desired shape, whereby dislocation of atomic distance remains in a crystalline lattice of said metal to render said atoms active to sputtering.
Claim 15
Dependent Claim
71 words
A glow discharge tube according to claim 10, in which said powder comprises at least one metal having a melting point higher than that of silver and at least one metal having a melting point lower than that of antimony, each of said metals being mixed in such a ratio that the intensity of each of the atomic light-absorption lines with respect to said metals is substantially equal to one another.
Claim 16
Dependent Claim
65 words
A glow discharge tube according to claim 10, in which said powder comprises at least one hard metal and at least one soft metal which functions as a binder for said hard metal, each of said metals being mixed in such a ratio that the intensity of each of atomic light-absorption lines with respect to each of said metals is substantially equal to one another.
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |