US3898501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light source lamp for atomic light absorption analysis
Assignee: Hitachi Ltd
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Filing: 1974-05-09
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Granted: 1975-08-05
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Expires: 1994-05-09
Abstract
Abstract In a lamp used as light source for atomic light absorption analysis, comprising a cathode having a hollow therein, an anode disposed in the vicinity thereof, a hermetical envelope to enclose the cathode and the anode, and gaseous atmosphere contained in envelope, the cathode is formed of an alloy composed of silver and at least one metal having a melting point equal to or lower than 500*C and emitting the same spectral line as the metal to be analyzed so that the cathode is prevented from being deformed and the luminous intensity and the analytic accuracy are improved.
Inventors
- 👤 Akira Hosoya
- 👤 Makoto Tadokoro
- 👤 Sadami Tomita
- 👤 Yoji Arai
- 👤 Shinji Mayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/066; H01J2893/00; H01J2893/0064; H01J2893/0065; H01J2893/0066
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
98 words
A LAMP USED AS LIGHT SOURCE FOR ATOMIC LIGHT ABSORPTION ANALYSIS COMPRISING A CATHODE HAVING A HOLLOW, AN ANODE ARRANGED IN THE VICINITY OF SAID CATHODE, A HERMETICAL ENVELOPE TO ENCLOSE SAID CATHOE AND ANODE, AAND GASEOUS ATMOSPHERE CONTAINED IN SAID ENVELOPE, WHEREIN SAID CATHODE IS FORMED OF A MOLTEN ALLOY OF SILVER AND AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF ZINC, BISMUTH, CADMIUM, TIN AND LEAD AND WHICH CAN EMIT THE SAME RESONANCE SPECTRAL LINE AS THE METAL TO BE ANALYZED AND SAID ALLOY HAS A PURITY EQUAL TO OR HIGHER THAN 99.9 PERCENT.
Claim 2
Dependent Claim
98 words
A LAMP USED AS LIGHT SOURCE FOR ATOMIC LIGHT ABSORPTION ANALYSIS COMPRISING A CATHODE HAVING A HOLLOW, AN ANODE ARRANGED IN THE VICINITY OF SAID CATHODE, A HERMETICAL ENVELOPE TO ENCLOSE SAID CATHOE AND ANODE, AAND GASEOUS ATMOSPHERE CONTAINED IN SAID ENVELOPE, WHEREIN SAID CATHODE IS FORMED OF A MOLTEN ALLOY OF SILVER AND AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF ZINC, BISMUTH, CADMIUM, TIN AND LEAD AND WHICH CAN EMIT THE SAME RESONANCE SPECTRAL LINE AS THE METAL TO BE ANALYZED AND SAID ALLOY HAS A PURITY EQUAL TO OR HIGHER THAN 99.9 PERCENT.
Claim 3
Dependent Claim
37 words
A lamp used as light source for atomic light absorption analysis, as claimed in claim 1, wherein said cathode is formed of an alloy composed of zinc 20 to 80 at. percent and silver as the rest.
Claim 4
Dependent Claim
37 words
A lamp used as light source for atomic light absorption analysis, as claimed in claim 1, wherein said cathode is formed of an alloy composed of bismuth 40 to 80 at. percent and silver as the rest.
Claim 5
Dependent Claim
37 words
A lamp used as light source for atomic light absorption analysis, as claimed in claim 1, wherein said cathode is formed of an alloy composed of cadmium 15 to 70 at. percent and silver as the rest.
Claim 6
Dependent Claim
37 words
A lamp used as light source for atomic light absorption analysis, as claimed in claim 1, wherein said cathode is formed of an alloy composed of tin 30 to 70 at. percent and silver as the rest.
Claim 7
Dependent Claim
37 words
A lamp used as light source for atomic light absorption analysis, as claimed in claim 1, wherein said cathode is formed of an alloy composed of lead 30 to 80 at. percent and silver as the rest.
Claim 8
Dependent Claim
43 words
A lamp used as light source for atomic light absorption analysis, as claimed in claim 1, wherein said cathode is formed of an alloy composed of cadmium 15 to 30 at. percent, lead 40 to 60 at. percent and silver as the rest.
Claim 9
Dependent Claim
43 words
A lamp used as light source for atomic light absorption analysis, as claimed in claim 1, wherein said cathode is formed of an alloy composed of cadmium 5 to 30 at. percent, zinc 10 to 30 at. percent and silver as the rest.
Claim 10
Dependent Claim
49 words
A lamp used as light source for atomic light absorption analysis, as claimed in claim 1, wherein said cathode is formed of an alloy composed of silver having a purity equal to or higher than 99.9 percent and metal having a purity equal to or higher than 99.9 percent.
Claim 11
Dependent Claim
31 words
A lamp used as light source for atomic light absorption analysis, as claimed in claim 1, wherein each of said at least one metal has a melting point lower than 500*C.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |