Patent US3694688A successfully refreshed from Google Patents.
US3694688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directly heated oxide cathode
Assignee: Individual
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Filing: 1971-09-21
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Granted: 1972-09-26
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Expires: 1991-09-21
Abstract
Abstract A directly heated cathode assembly comprising a tape-shaped member having a perforated central plane portion and end portions longitudinally extending from two sides of the central portion, a cathode plate member in spaced confronting relationship with one surface of the central portion, and electron emissive material embedded within the perforations of the central portion and interposed between the cathode plate member and the central portion. The width of the central portion of the tape-shaped member is greater than that of the end portions. The cathode plate member is secured to the central portion of the tape-shaped member at two oppositely located positions of the central portion spaced from the end portions.
Inventors
- 👤 Adrianus Kuiper
- 👤 Jan Willem Brouns
- 👤 Bauke Visser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:31
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/15
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A directly heated cathode assembly comprising a tape-shaped member having a central plane portion and end terminal portions longitudinally extending from two sides of said central portion, said central portion having a width greater than said end portions and being provided with a plurality of perforations, a cathode plate member in spaced confronting relationship with one surface of said central portion, electron emissive material embedded within said central portion and interposed between said cathode plate member and said central portion, and means for securing said cathode plate member to said central portion at two oppositely located positions of said central portion spaced from said end portions.
Claim 2
Dependent Claim
106 words
A directly heated cathode assembly comprising a tape-shaped member having a central plane portion and end terminal portions longitudinally extending from two sides of said central portion, said central portion having a width greater than said end portions and being provided with a plurality of perforations, a cathode plate member in spaced confronting relationship with one surface of said central portion, electron emissive material embedded within said central portion and interposed between said cathode plate member and said central portion, and means for securing said cathode plate member to said central portion at two oppositely located positions of said central portion spaced from said end portions.
Claim 3
Dependent Claim
24 words
A directly heated cathode assembly as claimed in claim 1, wherein said tape-shaped member essentially consists of a metal having a high melting point.
Claim 4
Dependent Claim
18 words
A directly heated cathode assembly as claimed in claim 1, wherein said tape-shaped member essentially consists of tungsten.
Claim 5
Dependent Claim
18 words
A directly heated cathode assembly as claimed in claim 1, wherein said tape-shaped member essentially consists of molybdenum.
Claim 6
Dependent Claim
19 words
A directly heated cathode assembly as claimed in claim 1, wherein said cathode plate member essentially consists of nickel.
Claim 7
Dependent Claim
27 words
A directly heated cathode assembly as claimed in claim 1, further comprising a layer of black nickel powder sintered to the surfaces of said cathode plate member.
Claim 8
Dependent Claim
44 words
A directly heated cathode assembly as claimed in claim 1, further comprising mating welded lugs on said tape-shaped member and said cathode plate member, said lugs being bent 180* and pressed against the surface of said cathode plate member remote from the emissive surface.
Claim 9
Dependent Claim
20 words
A directly heated cathode assembly as claimed in claim 1, wherein said tape-shaped member comprises end portions having elongated apertures.
References Cited (Backward Citations)
US3441767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |