US4900984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube with antistatic film on front panel
Assignee: Toshiba Corp
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Filing: 1988-04-27
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Granted: 1990-02-13
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Expires: 2008-04-27
Abstract
Abstract A cathode ray tube according to the present invention has a sufficient antistatic property which can be obtained by forming a glass film containing SiO 2 or P 2 O 5 as a main component and a hygroscopic metal salt on the outer surface of its front panel.
Inventors
- 👤 Takeo Itou
- 👤 Hidemi Matsuda
- 👤 Mamory Yoshizako
- 👤 Osamu Yagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:36
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/88; H01J29/867; H01J29/868
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
50 words
A cathode ray tube comprising: an envelope having a front panel; and a glass film formed on said front panel and containing SiO 2 or P 2 O 5 as a main component and a hygroscopic metal salt sealed in the interstices of the skeleton structure of said glass film.
Claim 2
Dependent Claim
50 words
A cathode ray tube comprising: an envelope having a front panel; and a glass film formed on said front panel and containing SiO 2 or P 2 O 5 as a main component and a hygroscopic metal salt sealed in the interstices of the skeleton structure of said glass film.
Claim 3
Dependent Claim
28 words
A cathode ray tube according to claim 1, wherein said hygroscopic metal salt is a salt of a metallic element having an atomic number of 31 or less.
Claim 4
Dependent Claim
34 words
A cathode ray tube according to claim 1, wherein said hygroscopic metal salt is contained in said glass film in an amount of 0.001 to 10% by weight with respect to said main component.
Claim 5
Dependent Claim
47 words
A glass solution for an antistatic film of a cathode ray tube comprising: a polysiloxane or alcoholate of Si; and a hygroscopic metal salt in an amount of 0.01 to 100% by weight with respect to SiO 2 stoichiometrically produced from said polysiloxane or alcoholate of Si.
Claim 6
Dependent Claim
47 words
A glass solution for an antistatic film of a cathode ray tube comprising: a polysiloxane or alcoholate of Si; and a hygroscopic metal salt in an amount of 0.01 to 100% by weight with respect to SiO 2 stoichiometrically produced from said polysiloxane or alcoholate of Si.
Claim 7
Dependent Claim
62 words
A cathode ray tube comprising: an envelope having a front panel; and a glass film formed on said front panel and containing SiO 2 or P 2 O 5 as a main component and a hygroscopic metal salt of a metallic element having an atomic number of 31 or less sealed in the interstices of the skeleton structure of said glass film.
Claim 8
Dependent Claim
62 words
A cathode ray tube comprising: an envelope having a front panel; and a glass film formed on said front panel and containing SiO 2 or P 2 O 5 as a main component and a hygroscopic metal salt of a metallic element having an atomic number of 31 or less sealed in the interstices of the skeleton structure of said glass film.
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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |