US3820487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light source lamp cathode for atomic light absorption analysis formedby compressing powder of cd cu with one of the powders of pb ba,pb caor pb sr
Assignee: Hitachi Ltd
•
Filing: 1973-05-09
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Granted: 1974-06-28
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Expires: 1993-05-09
Abstract
Abstract A hollow cathode lamp for atomic light absorption analysis which includes a hollow cathode fabricated by mixing and compressing the powder of Cd3Cu with at least one of the powders of Pb3Ba, Pb3Ca and Pb3Sr in a predetermined volume ratio into a hollow cathode shape.
Inventors
- 👤 H Okagaki
- 👤 Y Arai
- 👤 S Tomita
- 👤 A Hosoya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:30
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/066; H01J2893/00; H01J2893/0064; H01J2893/0065; H01J2893/0066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A light source lamp according to claim 1, wherein a volume ratio of said first powder to said second powder is 3 to 10 per one.
Claim 2
Dependent Claim
42 words
A light source lamp according to claim 1, wherein said molded body comprises said first and second powders in such a relation that the light intensities of lead and cadmium which are irradiated from said cathode are substantially equal to each other.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |