US4904895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron emission device
Assignee: Canon Inc
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Filing: 1988-05-02
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Granted: 1990-02-27
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Expires: 2008-05-02
Abstract
Abstract An electron emission device comprises an electron emission electrode with a pointed end and a counter electrode positioned opposite to the pointed end, both formed by fine working of a conductive layer laminated on an insulating substrate.
Inventors
- 👤 Takeo Tsukamoto
- 👤 Mamoru Miyawaki
- 👤 Tetsuya Kaneko
- 👤 Akira Suzuki
- 👤 Isamu Shimoda
- 👤 Toshihiko Takeda
- 👤 Masahiko Okunuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:45
CPC Classifications
H; H01; H01J; H01J3/00; H01J3/02; H01J3/021; H01J3/022; B; B82; B82Y; B82Y10/00; H01J1/00; H01J1/02; H01J1/30; H01J1/304; H01J1/3042
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
An electron emission device comprising an electron emission electrode with plural pointed ends and a counter electrode positioned opposite to said pointed ends, both formed by fine working of a conductive layer laminated on an insulating substrate, wherein a matrix structure is formed by wirings each having said plural pointed ends and by wirings having counter electrodes respectively corresponding to said pointed ends.
Claim 2
Dependent Claim
63 words
An electron emission device comprising an electron emission electrode with plural pointed ends and a counter electrode positioned opposite to said pointed ends, both formed by fine working of a conductive layer laminated on an insulating substrate, wherein a matrix structure is formed by wirings each having said plural pointed ends and by wirings having counter electrodes respectively corresponding to said pointed ends.
Claim 3
Dependent Claim
30 words
An electron emission device according to claim 1, wherein said counter electrode includes an attracting electrode which is composed of electrode members constituting a lens for converging the emitted electrons.
Claim 4
Dependent Claim
47 words
An electron emission device according to claim 2, comprising a recess on said insulating substrate, corresponding to at least one of a passing area of the electrons emitted by the pointed ends of said electron emission element and an area of electric field applied to said electrons.
Claim 5
Dependent Claim
21 words
An electron emission device according to claim 2, comprising selected ones of deflecting electrodes and lens electrodes behind said attracting electrode.
Claim 6
Dependent Claim
47 words
An electron emission device according to claim 4, comprising a recess on said insulating substrate, corresponding to at least one of a passing area of the electrons emitted by the pointed ends of said electron emission element and an area of electric field applied to said electrons.
Claim 7
Dependent Claim
60 words
An electron emission device comprising an electron emission electrode having a pointed end and an attracting electrode positioned opposite to said pointed end and having an electron emission aperture, both formed on an insulating substrate in substantially parallel manner to the surface of said substrate, and further comprising selected ones of deflecting electrodes and lens electrodes behind said attracting electrode.
Claim 8
Dependent Claim
60 words
An electron emission device comprising an electron emission electrode having a pointed end and an attracting electrode positioned opposite to said pointed end and having an electron emission aperture, both formed on an insulating substrate in substantially parallel manner to the surface of said substrate, and further comprising selected ones of deflecting electrodes and lens electrodes behind said attracting electrode.
Claim 9
Dependent Claim
47 words
An electron emission device according to claim 6, comprising a recess on said insulating substrate, corresponding to at least one of a passing area of the electrons emitted by the pointed ends of said electron emission element and an area of electric field applied to said electrons.
Claim 10
Dependent Claim
21 words
An electron emission device according to claim 6, formed by fine working of a conductive layer laminated on an insulating substrate.
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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) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |