Patent US4723091A successfully refreshed from Google Patents.
US4723091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Technique for preventing reflections in a cathode ray tube
Assignee: Hitachi Ltd
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Filing: 1985-04-08
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Granted: 1988-02-02
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Expires: 2005-04-08
Abstract
Abstract The panel face plate of a cathode ray tube is provided with an irregular film which is formed by spraying a mixed solution of silicon hydroxide, alcohol and alkyl acetate onto the panel face plate.
Inventors
- 👤 Hiromitsu Kawamura
- 👤 Akira Misumi
- 👤 Masayoshi Ezawa
- 👤 Katsumi Kobara
- 👤 Yoshiyuki Odaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:08
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/88; H01J29/89; H01J29/896
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
A cathode ray tube comprising a bulb having a panel face plate with its inner surface formed with a fluorescent screen which luminesces under bombardment of electron beams, and a film formed by using a solution of a mixture of silicon hydroxide, alcohol and alkyl acetate on the outer surface of said panel face plate, said film consisting essentially of silicon dioxide and having an optically uneven surface.
Claim 2
Dependent Claim
68 words
A cathode ray tube comprising a bulb having a panel face plate with its inner surface formed with a fluorescent screen which luminesces under bombardment of electron beams, and a film formed by using a solution of a mixture of silicon hydroxide, alcohol and alkyl acetate on the outer surface of said panel face plate, said film consisting essentially of silicon dioxide and having an optically uneven surface.
Claim 3
Dependent Claim
26 words
The cathode ray tube according to claim 1 wherein said mixted solution is sprayed on to a pre-heated panel face plate, and is subsequently heat treated.
Claim 4
Dependent Claim
25 words
The cathode ray tube according to claim 1 wherein said solution is sprayed on to a pre-heated panel face plate, and is subsequently heat treated.
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) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |