US4028114A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photochemical system for coating the luminescent screen of a color television picture tube
Assignee: Nokia Deutschland GmbH
•
Filing: 1975-03-10
•
Granted: 1977-06-07
•
Expires: 1995-03-10
Abstract
Abstract An improved photo-chemically active part of the fluorescent suspension for color TV picture tubes is provided. By adding polyether alcohol of the general formula HOCH 2 [CH 2 OCH 2 ] n CH 2 OH, three production factors are improved: adherence of the luminescent material to the glass, exposure time and reduced cross contamination.
Inventors
- 👤 Uwe Viohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:22
CPC Classifications
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
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
In a photochemical system for coating luminescent screens of color television picture tubes containing a photosensitive polyvinyl alcohol and a salt of chromic acid, the improvement comprising addition to said photochemical system of a polyether alcohol of the general formula HOCH 2 [CH 2 OCH 2 ] n CH 2 OH wherein the quantity n has a valve of from 2 to 3.
Claim 2
Dependent Claim
63 words
In a photochemical system for coating luminescent screens of color television picture tubes containing a photosensitive polyvinyl alcohol and a salt of chromic acid, the improvement comprising addition to said photochemical system of a polyether alcohol of the general formula HOCH 2 [CH 2 OCH 2 ] n CH 2 OH wherein the quantity n has a valve of from 2 to 3.
References Cited (Backward Citations)
US2990281A
Cited
US3558310A
Cited
US3779758A
Cited
US3906515A
Cited
US3788846A
Cited
US3917794A
Cited
US3887371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |