US3648092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arsenic-antimony-bismuth hollow cathode lamp
Assignee: Westinghouse Electric Corp
•
Filing: 1970-04-13
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Granted: 1972-03-07
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Expires: 1990-04-13
Abstract
Abstract A radiation source of the hollow cathode variety capable of emission of spectral radiation characteristic of the elements arsenic, antimony and bismuth.
Inventors
- 👤 James E Wooldridge
- 👤 George K Yamasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:21
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/066; H01J61/00; H01J2893/00; H01J2893/0063; H01J2893/0064; H01J2893/0065; H01J2893/0066
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
20 words
The radiation source of claim 1 in which said cathode is a cup-shaped member consisting essentially of said metallic substance.
Claim 2
Dependent Claim
81 words
A radiation source of the hollow cathode type comprising an anode and a cathode positioned within an envelope with a gas filling, said cathode including a metallic substance consisting essentially of arsenic, antimony and bismuth from which spectral emission characteristic of arsenic, antimony and bismuth is desired, said metallic substance consisting essentially of about 25 to 75 percent by weight of arsenic, about 15 to 50 percent by weight of antimony, and less than about 30 percent by weight of bismuth.
Claim 3
Dependent Claim
20 words
The radiation source of claim 3 in which said cathode is a cup-shaped member coNsisting essentially of said metallic substance.
References Cited (Backward Citations)
US3412278A
Cited
US3361925A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |