US2846609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-emissive electrode for electron discharge device
Assignee: US Philips Corp
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Filing: 1954-02-08
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Granted: 1958-08-05
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Expires: 1974-02-08
Abstract
No abstract record available.
Inventors
- 👤 Espersen George Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:57
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/30; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A VACUUM TUBE COMPRISING A THERMIONIC CATHODE CONTAINING A VOLATILIZABLE ALKALINE EARTH METAL COMPOUND, AND A NON-EMISSIVE ELECTRODE LOCATED ADJACENT SAID CATHODE IN THE PATH OF ALKALINE EARTH METAL COMPOUND PARTICLES EMITTED THEREFROM, SAID ELECTRODE CONSISTING OF ANNEALED DUCTILE SUBSTANTIALLY PURE TITANIUM METAL WIRE HAVING A SMOOTH, BRIGHT SURFACE.
Claim 2
Dependent Claim
49 words
A VACUUM TUBE COMPRISING A THERMIONIC CATHODE CONTAINING A VOLATILIZABLE ALKALINE EARTH METAL COMPOUND, AND A NON-EMISSIVE ELECTRODE LOCATED ADJACENT SAID CATHODE IN THE PATH OF ALKALINE EARTH METAL COMPOUND PARTICLES EMITTED THEREFROM, SAID ELECTRODE CONSISTING OF ANNEALED DUCTILE SUBSTANTIALLY PURE TITANIUM METAL WIRE HAVING A SMOOTH, BRIGHT SURFACE.
References Cited (Backward Citations)
US1760525A
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US1760526A
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US2233917A
Cited
US2534389A
Cited
US2417460A
Cited
US2417461A
Cited
US2491284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |