US4142987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminescent material dispersion
Assignee: US Philips Corp
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Filing: 1977-06-02
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Granted: 1979-03-06
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Expires: 1997-06-02
Abstract
Abstract A proper adherance of the luminescent material particles to the surface of the photoconductor is obtained when vinyl pyridinealkyl methacrylates polymers of 1-6, 6-14 and 14-20 carbon atoms are used as non-ionic macromolecular compounds.
Inventors
- 👤 Dirk J. Zwanenburg
- 👤 Hans-Georg Junginger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:57
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2276; C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L39/00; C08L39/02; C09; C09K; C09K11/00; C09K11/02; C08L2205/00; C08L2205/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
99 words
In a dispersion for electrophotographically applying luminescent materials to picture screens for color television tubes comprising a dispersion in a non-polar dispersing agent of a non-ionic macromolecular compound soluble in said dispersion agent, a luminescent material and a material for controlling the change of said luminescent material the improvement wherein said non-ionic macromolecular compound comprises mixed polymers of vinyl pyridines and alkyl methacrylates wherein the alkyls are of 6-14 carbon atoms and mixed polymers of vinyl pyridines and methacrylates partially esterified with alkyls of 1 to 6 carbon atoms and partially with alkyls of 14 to 20 carbon atoms.
Claim 2
Dependent Claim
99 words
In a dispersion for electrophotographically applying luminescent materials to picture screens for color television tubes comprising a dispersion in a non-polar dispersing agent of a non-ionic macromolecular compound soluble in said dispersion agent, a luminescent material and a material for controlling the change of said luminescent material the improvement wherein said non-ionic macromolecular compound comprises mixed polymers of vinyl pyridines and alkyl methacrylates wherein the alkyls are of 6-14 carbon atoms and mixed polymers of vinyl pyridines and methacrylates partially esterified with alkyls of 1 to 6 carbon atoms and partially with alkyls of 14 to 20 carbon atoms.
Claim 3
Dependent Claim
90 words
A dispersion as claimed in claim 1, characterized in that the mixed polymers have the following composition: 20 to 40 mole % vinyl pyridine, methacrylates which have been esterfied with alkyl groups having 1 to 6 carbon atoms present in an amount up to 40 mole %, at least 25 mole % methacrylates which have been esterified with alkyl groups having 6 to 14 carbon atoms, and methacrylates which have been esterified with alkyl groups having 14 to 20 carbon atoms present in an amount up to 50 mole %.
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) | 1982-03-05 | 1982-09-04 | 1983-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-05 | 1986-09-04 | 1987-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-05 | 1990-09-04 | 1991-03-06 | $7700.00 | Window Closed / Lapsed |