Patent US4689277A successfully refreshed from Google Patents.
US4689277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rare earth phosphor and radiographic image conversion screen
Assignee: Mitsubishi Chemical Corp
•
Filing: 1985-12-05
•
Granted: 1987-08-25
•
Expires: 2005-12-05
Abstract
Abstract A rare earth phosphor comprising a rare earth oxyhalide phosphor body and cinnamic acid which may have a hydrophobic substituent and which is adhered to or brought in contact with the phosphor body.
Inventors
- 👤 Yukinori Minagawa
- 👤 Minoru Tanaka
- 👤 Keiko Matsuo
- 👤 Etsuo Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:18
CPC Classifications
G; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/02; C09K11/025; C09K11/08; C09K11/77; C09K11/7701; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
55 words
A rare earth phosphor composition, comprising: a rare earth oxyhalide phosphor body and cinnamic acid, which may have a hydrophobic substituent, said cinnamic acid being preliminarily adhered to said phosphor body or being dissolved in a coating solution containing said phosphor body thereby being admixed with said phosphor body upon drying of applied coating solution.
Claim 2
Dependent Claim
55 words
A rare earth phosphor composition, comprising: a rare earth oxyhalide phosphor body and cinnamic acid, which may have a hydrophobic substituent, said cinnamic acid being preliminarily adhered to said phosphor body or being dissolved in a coating solution containing said phosphor body thereby being admixed with said phosphor body upon drying of applied coating solution.
Claim 3
Dependent Claim
27 words
The rare earth phosphor composition according to claim 1, wherein said phosphor body is admixed with cinnamic acid as the ingredients are formulated in said coating solution.
Claim 4
Dependent Claim
53 words
The rare earth phosphor composition according to claim 1, wherein the particles of said phosphor body are pretreated with an aqueous solution containing at least one type of ion selected from the group consisting of fluorine ions, phosphate ions, carbonate ions and sulfate ions, and then said particles are combined with cinnamic acid.
Claim 5
Dependent Claim
47 words
The rare earth phosphor composition according to claim 3, wherein the concentration of the ions is within a range of from 0.001 mol/liter calculated as the concentration of the salt from which the ions are derived, to a level not greater than the solubility of the salt.
Claim 6
Dependent Claim
21 words
The rare earth phosphor composition according to claim 1, wherein the rare earth oxyhalide phosphor is a rare earth oxybromide phosphor.
Claim 7
Dependent Claim
21 words
The rare earth phosphor composition accroding to claim 1, wherein the rare earth oxyhalide phosphor is a gadolinium or lanthanum phosphor.
Claim 8
Dependent Claim
45 words
A radiographic image conversion screen, comprising: a support; and a fluorescent layer formed on the support which is composed essentially of a rare earth oxyhalide phosphor particles dispersed in a binder resin, said fluorescent layer further containing cinnamic acid which may have a hydrophobic substituent.
Claim 9
Dependent Claim
45 words
A radiographic image conversion screen, comprising: a support; and a fluorescent layer formed on the support which is composed essentially of a rare earth oxyhalide phosphor particles dispersed in a binder resin, said fluorescent layer further containing cinnamic acid which may have a hydrophobic substituent.
Claim 10
Dependent Claim
27 words
The radiographic image conversion screen according to claim 7, wherein the fluorescent layer contains a rare earth oxyhalide phosphor to which the cinnamic acid is preliminarily adhered.
Claim 11
Dependent Claim
21 words
The radiographic image conversion screen according to claim 7, wherein the binder resin in the fluorescent layer contains the cinnamic acid.
Claim 12
Dependent Claim
35 words
The radiographic image conversion screen according to claim 7, wherein the fluorescent layer comprises a rare earth oxyhalide phosphor to which the cinnamic acid is preliminarily adhered and a binder resin containing the cinnamic acid.
Claim 13
Dependent Claim
34 words
The radiographic image conversion screen according to claim 7, wherein the amount of the cinnamic acid is within a range of from 0.05 to 10% by weight based on the rare earth oxyhalide phosphor.
Claim 14
Dependent Claim
34 words
The radiographic image conversion screen according to claim 11, wherein the amount of the cinnamic acid is within a range of from 2 to 6% by weight based on the rare earth oxyhalide phosphor.
Claim 15
Dependent Claim
24 words
The radiographic image conversion screen according to claim 7, wherein the particles of the rare earth oxyhalide phosphor are preliminarily treated for moisture resistance.
Claim 16
Dependent Claim
20 words
The radiographic image conversion screen according to claim 7, wherein the binder resin is cellulose acetate butyrate or polyvinyl butyral.
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) | 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 |