US5399185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a phosphor layer by reacting a doped substance with silica
Assignee: Siemens AG
•
Filing: 1992-06-29
•
Granted: 1995-03-21
•
Expires: 2012-06-29
Abstract
Abstract A doped starting substance is applied to a substrate composed of SiO 2 glass. A phosphor layer is formed by reaction of the starting substance with SiO 2 of the substrate to form a silicate of the starting substance. This reaction is carried out in a heat-treatment process in an oxygen-containing atmosphere. Zn or Gd is preferably used as starting substance.
Inventors
- 👤 Thomas Berthold
- 👤 Christa Grabmaier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:47
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C25/00; C03C25/10; C03C25/42; C09; C09K; C09K11/00; C09K11/08; C09K11/57; C09K11/572; C09K11/574; C09K11/74; C09K11/7442; C09K11/77; C09K11/77062; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/23; C03C2218/00; C03C2218/30; C03C2218/32
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
83 words
A process for producing a phosphor layer on a substrate comprising the steps of: applying a first layer composed of a starting substance doped with a dopant on a SiO 2 glass substrate; and producing a phosphor layer by reaction of said starting substance with the SiO 2 of the substrate to form a silicate of said starting substance by heat treatment at a reaction temperature in an oxygen-containing atmosphere, said SiO 2 glass substrate having a softening point above said reaction temperature.
Claim 2
Dependent Claim
83 words
A process for producing a phosphor layer on a substrate comprising the steps of: applying a first layer composed of a starting substance doped with a dopant on a SiO 2 glass substrate; and producing a phosphor layer by reaction of said starting substance with the SiO 2 of the substrate to form a silicate of said starting substance by heat treatment at a reaction temperature in an oxygen-containing atmosphere, said SiO 2 glass substrate having a softening point above said reaction temperature.
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1 wherein said first layer is applied by vapor deposition.
Claim 4
Dependent Claim
17 words
A process as claimed in claim 1, wherein said dopant is an oxide of said starting material.
Claim 5
Dependent Claim
47 words
A process as claimed in claim 1 wherein said first layer is selected from the group consisting of zinc and zinc oxide and wherein the step of producing said phosphor layer is further defined by conducting said heat treatment at a temperature of at least 900° C.
Claim 6
Dependent Claim
24 words
A process as claimed in claim 4 wherein said dopant comprises at least one dopant selected from the group consisting of bismuth and manganese.
Claim 7
Dependent Claim
50 words
A process as claimed in claim 1 wherein the doped starting substance is selected from the group consisting of Gd and Gd 2 O 3 and wherein the step of producing said phosphor layer is further defined by conducting said heat treatment at a temperature of at least 900° C.
Claim 8
Dependent Claim
24 words
A process as claimed in claim 6 wherein the dopant is selected from the group consisting of rare earths and oxides of rare earths.
Claim 9
Dependent Claim
43 words
A process as claimed in claim 1 comprising the additional step of: cooling said phosphor layer in a controlled manner after said heat treatment including cooling through a temperature range from 500° C. to 200° C. at less than 100° C. per hour.
Claim 10
Dependent Claim
16 words
A process as claimed in claim 1 wherein the substrate is a SiO 2 glass plate.
Claim 11
Dependent Claim
28 words
A process as claimed in claim 1 wherein the substrates an end face of at least one optical waveguide fiber composed of SiO 2 glass as a substrate.
Claim 12
Dependent Claim
19 words
A process as claimed in claim 10 wherein the at least one optical fiber is a monomodal optical fiber.
References Cited (Backward Citations)
CA572719A
Cited
US2219895A
Cited
US2408475A
Cited
US2689188A
Cited
US3279903A
Cited
GB1113101A
Cited
US3291706A
Cited
GB1225434A
Cited
US5302423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-20 | 1998-09-19 | 1999-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-20 | 2002-09-19 | 2003-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-20 | 2006-09-19 | 2007-03-21 | $7700.00 | Window Closed / Lapsed |