Patent US4054946A successfully refreshed from Google Patents.
US4054946A
Expired / Lapsed
US
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Electron source of a single crystal of lanthanum hexaboride emitting surface of (110) crystal plane
Assignee: AT&T Inc
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Filing: 1976-09-28
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Granted: 1977-10-18
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Expires: 1996-09-28
Abstract
Abstract An electron source using a single lanthanum hexaboride crystal oriented so the emitting surface is defined by a {110} crystal plane.
Inventors
- 👤 Stephen Duncan Ferris
- 👤 David Charles Joy
- 👤 Harry John Leamy
- 👤 Louis David Longinotti
- 👤 Paul Herman Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:57
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J1/148
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
27 words
An electron emission device comprising a lanthanum hexaboride single crystal characterized in that the emitting surface of said single crystal is defined by a {110} crystal plane.
Claim 2
Dependent Claim
27 words
An electron emission device comprising a lanthanum hexaboride single crystal characterized in that the emitting surface of said single crystal is defined by a {110} crystal plane.
Claim 3
Dependent Claim
20 words
An electron emission device as recited in claim 1 wherein said single crystal is used in a thermionic emission cathode.
Claim 4
Dependent Claim
19 words
An electron emission device as recited in claim 1 comprising vitreous carbon pieces, said pieces holding said single crystal.
Claim 5
Dependent Claim
18 words
An electron emission device as recited in claim 1 comprising molybdenum jaws, said jaws supporting said vitreous pieces.
Claim 6
Dependent Claim
17 words
An electron emission device as recited in claim 1 in which said single crystal is electrolytically shaped.
References Cited (Backward Citations)
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US3631291A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |