Patent US4293586A successfully refreshed from Google Patents.
US4293586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming a fluorescent screen
Assignee: Hitachi Ltd
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Filing: 1980-01-16
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Granted: 1981-10-06
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Expires: 2000-01-16
Abstract
Abstract In forming a fluorescent screen for a cathode ray tube, an undercoat layer is first coated on the inner face of the panel. The undercoat layer contains at least polystyrene particles with a film weight of 0.002 to 0.04 mg/cm 2 . Coated on the undercoat layer is phosphor slurry.
Inventors
- 👤 Takaaki Unnai
- 👤 Akiya Izumi
- 👤 Misturu Hinosugi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:43
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
A method for forming a fluorescent screen on a panel of a cathode ray tube comprising the steps of coating on the inner face of the panel an undercoat layer containing at least polystyrene particles and having a film weight of 0.002 to 0.04 mg/cm 2 , wherein the undercoat layer is made from an aqueous emulsion containing polystyrene particles of an average grain size of about 0.1 to 0.4 μm whose solid content is from about 0.3 to 4 weight %, and coating phosphor slurry on the undercoat layer.
Claim 2
Independent Claim
90 words
A method for forming a fluorescent screen on a panel of a cathode ray tube comprising the steps of coating on the inner face of the panel an undercoat layer containing at least polystyrene particles and having a film weight of 0.002 to 0.04 mg/cm 2 , wherein the undercoat layer is made from an aqueous emulsion containing polystyrene particles of an average grain size of about 0.1 to 0.4 μm whose solid content is from about 0.3 to 4 weight %, and coating phosphor slurry on the undercoat layer.
Claim 3
Dependent Claim
27 words
A method for forming a fluorescent screen as claimed in claim 1 wherein the film weight is in the range of 0.005 to 0.03 mg/cm 2 .
Claim 4
Dependent Claim
22 words
A method for forming a fluorescent screen as claimed in claim 1 wherein the undercoat layer further comprises an adhesive reinforcing agent.
Claim 5
Dependent Claim
21 words
A method for forming a fluorescent screen as claimed in claim 3 wherein the undercoat layer further comprises water soluble resins.
Claim 6
Independent Claim
38 words
A method for forming a fluorescent screen as claimed in any of claims 1 to 4 wherein the undercoat layer further comprises at least one of a film plasticizer, a viscosity intensifier agent and a surface active agent.
References Cited (Backward Citations)
US3966474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |