US2739084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary electron emitting coatings and method for producing same
Assignee: EMI Ltd
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Filing: 1952-04-15
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Granted: 1956-03-20
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Expires: 1972-04-15
Abstract
No abstract record available.
Inventors
- 👤 Sommer Alfred Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:35
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/14; C23C14/18; C23C14/58; C23C14/5806; C23C14/5826; C23C14/5846; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; H01J29/39; H01J29/43; H01J40/00; H01J40/02; H01J40/04; H01J40/06; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12542
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
61 words
A METHOD OF MANUFACTURING AN ELECTRODE CAPABLE OF EMITTING ELCTRONS WHEN EXPOSED TO LIGHT, SAID METHOD COMPRISING THE STEPS OF EVAPORATING AN ALLOY BODY CONTAINING ABOUT TWO PARTS OF BISMUTH AND ONE PART OF GOLD TO DEPOSIT BISMUTH AND GOLD ON A SUPPORTING SURFACE, AND EXPOSING THE BISMUTH AND GOLD DEPOSITED ON SAID SUPPORTING SURFACE TO OXYGEN AND AN ALKALI METAL.
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) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |