US3758802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved cathode ray tube having a glass envelope coated with crystallized glass
Assignee: NEC Corp
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Filing: 1971-01-20
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Granted: 1973-09-11
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Expires: 1991-01-20
Abstract
Abstract A cathode ray tube including an electron gun enclosed by a glass envelope including a neck portion is disclosed in accordance with the teachings of the present invention wherein arcing between electrodes of the cathode ray tube is minimized by providing a coating of crystallized glass formed by heat-treatment of sealing glass, on the surface of the inner wall of said neck portion and coextensive with said electron gun, and a coating of conductive material, spaced from said coating of crystallized glass, on the surface of the inner wall of said neck portion. A method of treating a cathode ray tube to minimize arcing between the electrodes thereof is also disclosed.
Inventors
- 👤 T Kubo
- 👤 M Itazu
- 👤 H Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:43
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/88; H01J2229/00; H01J2229/88; H01J2229/882
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
46 words
In a cathode ray tube including an electron gun enclosed by a glass envelope, the improvement comprising a film consisting of crystallized glass formed by heat-treatment sealing glass coated on the surface of the inner wall of said glass envelope and coextensive with said electron gun.
Claim 2
Dependent Claim
46 words
In a cathode ray tube including an electron gun enclosed by a glass envelope, the improvement comprising a film consisting of crystallized glass formed by heat-treatment sealing glass coated on the surface of the inner wall of said glass envelope and coextensive with said electron gun.
Claim 3
Dependent Claim
16 words
The improvement of claim 1 wherein said film consisting of crystallized glass includes a rough surface.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |