US4361781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple electron beam cathode ray tube
Assignee: International Business Machines Corp
•
Filing: 1980-05-12
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Granted: 1982-11-30
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Expires: 2000-05-12
Abstract
Abstract A multiple electron beam cathode ray tube has a plurality of cathodes in a plane to form an array. Grids on the same substrate are positioned in spaced relation about the cathodes so that a plurality of individually controlled electron beams are formed when appropriate potentials are applied to the cathodes and grids.
Inventors
- 👤 Steven W. Depp
- 👤 Bruce P. Piggin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:55
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/128; H01J29/00; H01J29/46; H01J29/48; H01J29/50; H01J2229/00; H01J2229/48; H01J2229/50; H01J2229/505
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
94 words
An integral structure for use in a cathode ray tube having a fluorescent screen device comprising: an electrically insulating substrate, a plurality of cathodes on said substrate to form an array, a heater associated with said substrate for heating said cathodes and a plurality of grids on said substrate positioned in spaced relation around and individually surrounding said cathoder said cathodes so as to be substantially coplanar therewith wherein a plurality of individually controllable electron beams are formed which would subsequently strike the screen when appropriate potentials are applied to said cathodes and grids.
Claim 2
Dependent Claim
94 words
An integral structure for use in a cathode ray tube having a fluorescent screen device comprising: an electrically insulating substrate, a plurality of cathodes on said substrate to form an array, a heater associated with said substrate for heating said cathodes and a plurality of grids on said substrate positioned in spaced relation around and individually surrounding said cathoder said cathodes so as to be substantially coplanar therewith wherein a plurality of individually controllable electron beams are formed which would subsequently strike the screen when appropriate potentials are applied to said cathodes and grids.
Claim 3
Dependent Claim
31 words
A structure as defined in claim 1 wherein the heater is positioned on the first side of the substrate and the cathode is positioned on the second side of the substrate.
Claim 4
Dependent Claim
18 words
A structure as defined in claim 1 including electrical means connected individually to said cathodes and said grids.
Claim 5
Dependent Claim
21 words
A structure as defined in claim 3 wherein said electrical means individually modulates the potentials between said grids and said cathodes.
Claim 6
Dependent Claim
18 words
A structure as defined in claim 3 wherein the electrical means provides a constant potential to said grids.
Claim 7
Dependent Claim
18 words
A structure as defined in claim 3 wherein the electrical means provides a constant potential to said cathodes.
Claim 8
Dependent Claim
15 words
A structure as defined in claim 3 wherein said electrical means passes through said insulator.
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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) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |