US3945949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali metal vapour generator
Assignee: US Philips Corp
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Filing: 1973-06-07
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Granted: 1976-03-23
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Expires: 1993-06-07
Abstract
Abstract For the introduction of an alkali metal vapour into an electric discharge tube, in particular for the vapour deposition of surfaces for photo-emission or secondary electron emission in such a tube, generators are used which comprise a filling which consists of at least one alkali metal alloyed with gold and/or silver, and/or copper alloyed with gold or silver.
Inventors
- 👤 Johannes Hendrikus Nicolaas Van Vucht
- 👤 Jan Josephus Bernardus Fransen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:44
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/38; H01J9/395
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
An alkali metal vapour generator comprising a material which consists essentially of at least one alkali metal and a further metal having a lower vapour pressure than said alkali metal, said further metal consisting essentially of at least one element selected from the group consisting of gold, silver and copper, with the proviso that said further metal include at least one of gold and silver.
Claim 2
Dependent Claim
65 words
An alkali metal vapour generator comprising a material which consists essentially of at least one alkali metal and a further metal having a lower vapour pressure than said alkali metal, said further metal consisting essentially of at least one element selected from the group consisting of gold, silver and copper, with the proviso that said further metal include at least one of gold and silver.
Claim 3
Dependent Claim
14 words
An alkali metal vapour generator as in claim 1, wherein said material is single-phase.
Claim 4
Dependent Claim
42 words
An alkali metal vapour generator as in claim 1, wherein said material consists essentially of at least one of the alloys Au 2 Na, Au 5 Na, Au 2 K, Au 5 K and a caesium alloy which is rich in gold.
Claim 5
Dependent Claim
30 words
An alkali metal vapour generator as in claim 1, wherein said material is a multicomponent alloy consisting essentially of at least one of sodium and potassium, and said further metal.
References Cited (Backward Citations)
US2439647A
Cited
US2834905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |