US3974416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple electrode support members with low coefficient of expansion
Assignee: US Philips Corp
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Filing: 1975-03-19
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Granted: 1976-08-10
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Expires: 1995-03-19
Abstract
Abstract An electron gun assembly for generating a plurality of converging electron beams wherein at least one control electrode is supported eccentrically relative to the tube axis by a supporting member having a coefficient of linear expansion lower than 80.10 - 7 /°C.
Inventors
- 👤 Antonie Sijtze VAN DER Goot
- 👤 Peter Hermans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:43
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/50; H01J29/503; H01J29/484
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A color cathode ray tube comprising, in an evacuated envelope, means to generate at least two electron beams, said means comprising a number of electrodes including at least one control electrode having an aperture situated eccentrically relative to the tube axis for passing an electron beam to a convergence point, supporting members for securing said electrodes in a predetermined space relationship and having free ends secured in assembly members consisting of electrically insulating material, the eccentricity of said at least one control electrode aperture being determined by supporting means having a coefficient of linear expansion less than 80.10 - 7 /°C.
Claim 2
Dependent Claim
101 words
A color cathode ray tube comprising, in an evacuated envelope, means to generate at least two electron beams, said means comprising a number of electrodes including at least one control electrode having an aperture situated eccentrically relative to the tube axis for passing an electron beam to a convergence point, supporting members for securing said electrodes in a predetermined space relationship and having free ends secured in assembly members consisting of electrically insulating material, the eccentricity of said at least one control electrode aperture being determined by supporting means having a coefficient of linear expansion less than 80.10 - 7 /°C.
Claim 3
Dependent Claim
35 words
A cathode-ray tube as claimed in claim 1 wherein the said material having a low coefficient of linear expansion consists of an alloy of iron and nickel containing 30 to 40% by weight of nickel.
Claim 4
Dependent Claim
43 words
A cathode-ray tube as claimed in claim 1 wherein the said material having a low coefficient of expansion consists of an alloy of iron, nickel and cobalt containing 28 to 30% by weight of nickel and 18 to 20% by weight of cobalt.
Claim 5
Dependent Claim
30 words
A cathode-ray tube as claimed in claim 1, and comprising in an evacuated envelope means to generate three electron beams the axes of which are situated substantially in one plane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |