US4318971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming fluorescent screen of color picture tube
Assignee: Hitachi Ltd
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Filing: 1981-02-12
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Granted: 1982-03-09
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Expires: 2001-02-12
Abstract
Abstract The photosensitive resin which exhibits stickiness by photo-reaction is added with a binder which does not substantially raise dark reaction, and a resultant mixture is applied onto the inner surface of face panel of the color picture tube to form a film. Portion of the film where powdery material is going to be applied is exposed to light and rendered sticky. Phosphor powder, when used as the powdery material, is applied to the sticky portion and adhered thereto to form a fluorescent screen.
Inventors
- 👤 Masahiro Nishizawa
- 👤 Kiyoshi Miura
- 👤 Hiroshi Yokomizo
- 👤 Osamu Sasaya
- 👤 Hajime Morishita
- 👤 Shoichi Uchino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:21
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/22; H01J29/225; G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
121 words
In a method of forming a fluorescent screen of a color picture tube comprising: applying a photosensitive resin mainly containing diazonium salt to the inner surface of a face panel of the color picture tube so that a photosensitive resin film is formed on said panel, making sticky the portion of said film where a phosphor layer is going to be formed by photosensitive reaction and absorption of moisture in the air, and adhering powdery material such as phosphor powder and/or graphite powder on said sticky portion of said film, the improvement wherein a binder which does not substantially raise dark reaction is added to said photosensitive resin and resultant mixture is applied to said face panel to form a film.
Claim 2
Dependent Claim
121 words
In a method of forming a fluorescent screen of a color picture tube comprising: applying a photosensitive resin mainly containing diazonium salt to the inner surface of a face panel of the color picture tube so that a photosensitive resin film is formed on said panel, making sticky the portion of said film where a phosphor layer is going to be formed by photosensitive reaction and absorption of moisture in the air, and adhering powdery material such as phosphor powder and/or graphite powder on said sticky portion of said film, the improvement wherein a binder which does not substantially raise dark reaction is added to said photosensitive resin and resultant mixture is applied to said face panel to form a film.
Claim 3
Dependent Claim
19 words
The method for formation in accordance with claim 1, wherein said binder is a bivalent or more metallic salt.
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) | 1985-03-08 | 1985-09-07 | 1986-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-08 | 1989-09-07 | 1990-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-08 | 1993-09-07 | 1994-03-09 | $7700.00 | Window Closed / Lapsed |