US4152483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigment coated phosphor and process for manufacturing the same
Assignee: Dai Nippon Toryo Co Ltd
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Filing: 1977-11-18
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Granted: 1979-05-01
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Expires: 1997-11-18
Abstract
Abstract On the surface of a phosphor, pigment particles are uniformly adhered by a layer of a gelatin-gum arabic mixture. A process for manufacturing such a pigment coated phosphor includes the steps of preparing an aqueous solution of gelatin and an aqueous solution of gum arabic, allowing the phosphor to disperse homogeneously into one of these aqueous solutions, allowing the pigment particles to disperse homogeneously into the other aqueous solution, and mixing the so obtained phosphor and pigment dispersions.
Inventors
- 👤 Katuzo Kanda
- 👤 Noboru Kotera
- 👤 Seiji Murakami
- 👤 Thihiro Yoshida
- 👤 Shusaku Eguchi
- 👤 Toshiaki Hatsumi
- 👤 Kazuhito Iwasaki
- 👤 Isao Iwamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:51
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
35 words
A pigment coated phosphor wherein not more than 15 parts by weight of pigment particles adhere uniformly to the surface of 100 parts by weight of phosphor through a layer of a gelatin-gum arabic mixture.
Claim 2
Dependent Claim
35 words
A pigment coated phosphor wherein not more than 15 parts by weight of pigment particles adhere uniformly to the surface of 100 parts by weight of phosphor through a layer of a gelatin-gum arabic mixture.
Claim 3
Dependent Claim
36 words
The pigment coated phosphor as defined in claim 1 wherein said pigment particles adhere in an amount ranging from 0.1 part by weight to 10 parts by weight to 100 parts by weight of said phosphor.
Claim 4
Dependent Claim
60 words
The pigment coated phosphor as defined in claim 2 wherein a europium activated yttrium oxysulfide phosphor is employed as said phosphor and cadmium sulfoselenide or rouge is employed as said pigment particles and further, said pigment particles adhere in an amount ranging from 0.1 part by weight to 2 parts by weight to 100 parts by weight of said phosphor.
Claim 5
Dependent Claim
66 words
The pigment coated phosphor as defined in claim 2 wherein a silver activated zinc sulfide phosphor or a silver and aluminum activated zinc sulfide phosphor is employed as said phosphor and cobalt blue or ultramarine is employed as said pigment particles and further, said pigment particles adhere in an amount ranging from 0.5 to 10 parts by weight to 100 parts by weight of said phosphor.
Claim 6
Dependent Claim
90 words
A process for manufacturing a pigment coated phosphor which comprises the steps of preparing an aqueous solution of 0.01 to 1.2 parts by weight of gelatin and an aqueous solution of 0.01 to 1.2 parts by weight of gum arabic, homogeneously dispersing 100 parts by weight of phosphor into one of the aqueous solution, homogeneously dispersing not more than 15 parts by weight of pigment particles into the other aqueous solution and mixing the two resulting dispersions to allow the pigment particles to adhere to the surface of the phosphor.
Claim 7
Dependent Claim
90 words
A process for manufacturing a pigment coated phosphor which comprises the steps of preparing an aqueous solution of 0.01 to 1.2 parts by weight of gelatin and an aqueous solution of 0.01 to 1.2 parts by weight of gum arabic, homogeneously dispersing 100 parts by weight of phosphor into one of the aqueous solution, homogeneously dispersing not more than 15 parts by weight of pigment particles into the other aqueous solution and mixing the two resulting dispersions to allow the pigment particles to adhere to the surface of the phosphor.
Claim 8
Dependent Claim
37 words
The process for manufacturing a pigment coated phosphor as defined in claim 5 wherein said pigment particles adhere in a proportion ranging from 0.1 to 10 parts by weight per 100 parts by weight of said phosphor.
Claim 9
Dependent Claim
65 words
The process for manufacturing a pigment coated phosphor as defined in claim 6 wherein a europium activated yttrium oxysulfide phosphor is employed as said phosphor and cadmium sulfoselenide or rouge is employed as said pigment particles and further, said pigment particles adhere in a proportion ranging from 0.1 to 2 parts by weight per 100 parts by weight of said phosphor to the surface thereof.
Claim 10
Dependent Claim
75 words
The process for manufacturing a pigment coated phosphor as defined in claim 6 wherein a silver activated zinc sulfide or a silver and aluminum activated zinc sulfide phosphor is employed as said phosphor and cobalt blue or ultramarine is used as said pigment particles and further, said pigment particles adhere to the surface of said phosphor in a proportion ranging from 0.5 to 10 parts by weight per 100 parts by weight of said phosphor.
Claim 11
Dependent Claim
98 words
A process for manufacturing a pigment coated phosphor which comprises the steps of preparing an aqueous solution of 0.01 to 1.2 parts by weight of gelatin and an aqueous solution of 0.01 to 1.2 parts by weight of gum arabic, homogeneously dispersing 100 parts by weight of phosphor into one of the aqueous solutions, homogeneously dispersing not more than 15 parts by weight of pigment particles into the other solution, mixing the two resulting dispersions, cooling the mixed dispersion, and adding a hardening agent thereto to allow the pigment particles to adhere to the surface of the phosphor.
Claim 12
Dependent Claim
98 words
A process for manufacturing a pigment coated phosphor which comprises the steps of preparing an aqueous solution of 0.01 to 1.2 parts by weight of gelatin and an aqueous solution of 0.01 to 1.2 parts by weight of gum arabic, homogeneously dispersing 100 parts by weight of phosphor into one of the aqueous solutions, homogeneously dispersing not more than 15 parts by weight of pigment particles into the other solution, mixing the two resulting dispersions, cooling the mixed dispersion, and adding a hardening agent thereto to allow the pigment particles to adhere to the surface of the phosphor.
Claim 13
Dependent Claim
21 words
The process for manufacturing a pigment coated phosphor as defined in claim 9 wherein formaline is employed as said hardening agent.
Claim 14
Dependent Claim
21 words
The process for manufacturing a pigment coated phosphor as defined in claim 9 wherein glutaraldehyde is employed as said hardening agent.
Claim 15
Dependent Claim
43 words
The process for manufacturing a pigment coated phosphor as defined in claim 9 wherein said pigment particles adhere to the surface of said phosphor in a proportion ranging from 0.1 to 10 parts by weight per 100 parts by weight of said phosphor.
Claim 16
Dependent Claim
67 words
The process for manufacturing a pigment coated phosphor as defined in claim 12 wherein a europium activated yttrium oxysulfide phosphor is employed as said phosphor and cadmium sulfoselenide or rouge is employed as said pigment particles and further, said pigment particles adhere to the surface of said phosphor in a proportion ranging from 0.1 to 2 parts by weight per 100 parts by weight of said phosphor.
Claim 17
Dependent Claim
75 words
The process for manufacturing a pigment coated phosphor as defined in claim 12 wherein a silver activated zinc sulfide or a silver and aluminum activated zinc sulfide phosphor is employed as said phosphor and cobalt blue or ultramarine is employed as said pigment particles and further, said pigment particles adhere to the surface of said phosphor in a proportion ranging from 0.5 to 10 parts by weight per 100 parts by weight of said phosphor.
References Cited (Backward Citations)
US3275466A
Cited
US3308326A
Cited
US3875449A
Cited
US3886394A
Cited
US4021588A
Cited
US4049845A
Cited
US4020231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |