Patent US4689172A successfully refreshed from Google Patents.
US4689172A
Expired / Lapsed
US
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Process of surface treating luminescent materials
Assignee: Tungsram Rt
•
Filing: 1986-05-14
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Granted: 1987-08-25
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Expires: 2006-05-14
Abstract
Abstract The luminescent material(s) optionally composed of more color components are suspended in the solution of active agent(s) and treated with 0.5 to 10% by weight of glass forming acid or a mixture thereof, preferably boric acid or phosphoric acid calculated on the weight of the luminescent material. Then a solution comprising 1 to 15% by weight of aliphatic amines calculated on the weight of the luminescent materials is added and the mixture thus obtained is homogenized.
Inventors
- 👤 Andras Czeiler
- 👤 Sandor Lukacs
- 👤 Tamas Palotai
- 👤 Tibor Lakatos
- 👤 Gyorgy Bakdos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:07
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/221; H01J9/225
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A process of surface treating a luminescent material which comprises treating a suspension of at least one luminescent material with 0.5 to 10% by weight of a glass-forming acid or a mixture thereof calculated on the weight of the luminescent material, and thereafter adding a solution comprising 1 to 15% by weight of at least one aliphatic amine calculated on the weight of the luminescent material.
Claim 2
Dependent Claim
66 words
A process of surface treating a luminescent material which comprises treating a suspension of at least one luminescent material with 0.5 to 10% by weight of a glass-forming acid or a mixture thereof calculated on the weight of the luminescent material, and thereafter adding a solution comprising 1 to 15% by weight of at least one aliphatic amine calculated on the weight of the luminescent material.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1 which comprises mixing n-butylamine dissolved in acetone to a suspension of ethanolic boric acid and the luminescent material.
Claim 4
Dependent Claim
26 words
The process as claimed in claim 1 which comprises mixing n-octylamine dissolved in ethyl acetate to the suspension of ethanolic phosphoric acid and the luminescent material.
Claim 5
Dependent Claim
23 words
The process as claimed in claim 1 which comprises mixing n-butylamine dissolved in acetone to a suspension of ethanolic boric and phosphoric acid.
Claim 6
Dependent Claim
26 words
The process as claimed in claim 1, wherein the glass-forming acid is selected from the group consisting of boric acid and phosphoric acid and mixtures thereof.
Claim 7
Dependent Claim
16 words
The process as claimed in claim 1, wherein the glass-forming acid is in an alcoholic solution.
Claim 8
Dependent Claim
15 words
The process as claimed in claim 6, wherein the alcoholic solution is an ethanolic solution.
Claim 9
Dependent Claim
28 words
The process as claimed in claim 1, wherein the aliphatic amine is added as a solution in a solvent selected from the group consisting of esters and ketones.
Claim 10
Dependent Claim
18 words
The process as claimed in claim 8, wherein the ester is ethyl acetate and the ketone is acetone.
Claim 11
Dependent Claim
17 words
The process as claimed in claim 1, wherein the alkylamine contains from 1 to 8 carbon atoms.
Claim 12
Dependent Claim
20 words
The process as claimed in claim 10, wherein the alkylamine is selected from the group consisting of n-butylamine and n-octylamine.
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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) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |