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US3637410A
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Method of treating cathodo-luminescent phosphors
Assignee: GARY L STEVENS
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Filing: 1968-12-18
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Granted: 1972-01-25
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Expires: 1988-12-18
Abstract
Abstract A method of treating an expanse of phosphor material to remove selected spots which have interfering luminescent properties. The method consists of isolating and identifying spots or areas considered to be objectionable as regards the desired function of the particular phosphor, and then focusing a laser beam of selected wavelength at each spot whereupon the phosphor material absorbs the laser generated radiant energy to develop heat energy sufficient to effect vaporization of the spot of phosphor material.
Inventors
- 👤 Gary L Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:45
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/18; B; B23; B23K; B23K26/00; B23K26/0006; H01J29/00; H01J29/02; H01J29/10; H01J29/18; B23K2103/00; B23K2103/16; B23K2103/50; B23K2103/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
35 words
A method as set forth in claim 1 which includes the further steps of: repetitively moving and reenergizing the focused laser beam until all of the phosphor material causing said bright spot has been removed.
Claim 2
Dependent Claim
52 words
A method for removing bright spots as set forth in claim 1 which is further characterized in that: the laser beam is focused in the plane of the phosphor material or just forward thereto in the plane of the glass tube face such that no damage occurs to internal metallic tube elements.
Claim 3
Dependent Claim
36 words
A method as set forth in claim 3 in which includes the further steps of: repetitively moving and reenergizing the focused laser beam until all of the phosphor material causing said bright spot has been removed.
Claim 4
Dependent Claim
26 words
A method as set forth in claim 1 wherein: said cathode ray tube is a direct view storage tube having a relatively short persistence phosphor material.
Claim 5
Dependent Claim
18 words
A method as set forth in claim 1 wherein: said phosphor material is zinc sulphide with copper activator.
Claim 6
Dependent Claim
17 words
A method as set forth in claim 5 or 6 wherEin: said phosphor material has aluminized backing.
Claim 7
Independent Claim
57 words
A method for treating an expanse of phosphor material having randomly spaced spots of objectionable high brightness luminescence, comprising the step of: focusing a laser beam upon or proximate to each of said high brightness spots, said laser beam being of a wavelength which is readily absorbed by said phosphor material such that said material is vaporized.
References Cited (Backward Citations)
US3236707A
Cited
US3560258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |