Patent US4409306A successfully refreshed from Google Patents.
US4409306A
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Method of preparing a phosphor suspension
Assignee: Nokia Deutschland GmbH
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Filing: 1982-03-02
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Granted: 1983-10-11
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Expires: 2002-03-02
Abstract
Abstract Method of preparing a phosphor suspension by mixing a photosensitive material, a photosensitizer, and a phosphor for the purpose of forming a photosensitive film. The photosensitizer in the suspension is a chromic-acid solution. With such a phosphor suspension, a firmly adhering, uniform and compact phosphor film can be formed on the screen substrate. In addition, the phosphor areas obtained by this method have very sharp boundaries.
Inventors
- 👤 Volker Gerstle
- 👤 Gerhard Mauz
- 👤 Rolf Zondler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:19
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/04; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/22; H01J29/225; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/11; Y10S430/114
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
36 words
Method of preparing a phosphor suspension by mixing a photosensitive material, a photosensitizer, and a phosphor for the purpose of forming a photosensitive film, characterized in that the photosensitizer in the suspension is a chromic-acid solution.
Claim 2
Dependent Claim
36 words
Method of preparing a phosphor suspension by mixing a photosensitive material, a photosensitizer, and a phosphor for the purpose of forming a photosensitive film, characterized in that the photosensitizer in the suspension is a chromic-acid solution.
Claim 3
Dependent Claim
22 words
A method as claimed in claim 1, characterized in that the percentage by weight of chromic-acid solution in the suspension is 0.1-15%.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 2, characterized in that the percentage by weight of chromic-acid solution in the suspension is preferably 5-10%.
Claim 5
Dependent Claim
24 words
A method as claimed in claim 1, characterized in that the photosensitive material and the chromic-acid solution are mixed before the phosphor is added.
Claim 6
Dependent Claim
18 words
A method as claimed in claim 1 or 4, characterized in that the photosensitive material is polyvinyl alcohol.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |