Patent US4933108A successfully refreshed from Google Patents.
US4933108A
Expired / Lapsed
US
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Emitter for field emission and method of making same
Assignee: Individual
•
Filing: 1979-04-12
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Granted: 1990-06-12
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Expires: 1999-04-12
Abstract
Abstract A field emitter consists of a metal carrier wire coated with crystals of an oxide having a metallic luster and which is a compound of a transition metal selected from the group consisting of tungsten, molybdenum, niobium, vanadium and titanium.
Inventors
- 👤 Sven G. Soredal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:03
CPC Classifications
H; H01; H01J; H01J27/00; H01J27/02; H01J27/26; H01J1/00; H01J1/02; H01J1/30; H01J1/304; H01J9/00; H01J9/02; H01J9/022; H01J9/025
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
45 words
An emitter for field emission consisting essentially of a metal carrier wire coated with crystals of an oxide compound which has a metallic luster and which is a compound of a transition metal selected from the group consisting of tungsten, molybdenum, niobium, vanadium and titanium.
Claim 2
Dependent Claim
45 words
An emitter for field emission consisting essentially of a metal carrier wire coated with crystals of an oxide compound which has a metallic luster and which is a compound of a transition metal selected from the group consisting of tungsten, molybdenum, niobium, vanadium and titanium.
Claim 3
Dependent Claim
22 words
The emitter of claim 1, in which the carrier wire is made of the same transition metal as contained in said crystals.
Claim 4
Dependent Claim
14 words
The emitter of claim 1, in which said crystals consist of lithium tungstate bronze.
Claim 5
Dependent Claim
14 words
The emitter of claim 3, in which the carrier wire is made of tungsten.
References Cited (Backward Citations)
US3842309A
Cited
US4147954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |