Patent US4791267A successfully refreshed from Google Patents.
US4791267A
Expired / Lapsed
US
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Method of forming identifying indicium on cathode ray tubes
Assignee: Mitsubishi Electric Corp
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Filing: 1988-01-27
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Granted: 1988-12-13
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Expires: 2008-01-27
Abstract
Abstract A method for forming an identifying indicia on a cathode ray tube being manufactured, which method is practiced by applying a paint containing a powdered metal to a particular exterior surface portion of a glass envelope, forming a part of the cathode ray tube, to form a solid paint layer, followed by the radiation of a laser beam onto at least a portion of the solid paint layer to form the identifying indicia represented by at least one trace of plasticized deformation on a surface region of the solid paint layer.
Inventors
- 👤 Keishi Yokoyama
- 👤 Mitsuru Matsushita
- 👤 Tetsuya Ohtsuka
- 👤 Yuji Okazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:04
CPC Classifications
H; H01; H01J; H01J9/00; B; B41; B41M; B41M5/00; B41M5/26; B41M5/262; H01J2209/00; H01J2209/46; H01J2209/463; H01J2209/466
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
A method for forming an identifying indicia on a cathode ray tube comprising an envelope, which method comprises the steps of: applying a paint containing a powdered metal, mixed in a matrix and a solvent, to a selected exterior surface portion of the envelope, said paint being of a nature capable of withstanding both heat treatment and chemical treatment generally practiced in the manufacture of the cathode ray tube; drying the applied paint to form a solid paint layer; and radiating a laser beam, with the use of a laser beam radiator, onto a portion of the solid paint layer to form the identifying indicia represented by at least one trace of plasticized deformation on a surface region of the solid paint layer.
Claim 2
Independent Claim
123 words
A method for forming an identifying indicia on a cathode ray tube comprising an envelope, which method comprises the steps of: applying a paint containing a powdered metal, mixed in a matrix and a solvent, to a selected exterior surface portion of the envelope, said paint being of a nature capable of withstanding both heat treatment and chemical treatment generally practiced in the manufacture of the cathode ray tube; drying the applied paint to form a solid paint layer; and radiating a laser beam, with the use of a laser beam radiator, onto a portion of the solid paint layer to form the identifying indicia represented by at least one trace of plasticized deformation on a surface region of the solid paint layer.
Claim 3
Dependent Claim
21 words
The method as claimed in claim 1, wherein the metal is selected from the group consisting of stainless steel and aluminum.
Claim 4
Dependent Claim
13 words
The method as claimed in claim 1, wherein the matrix is silicone resin.
Claim 5
Dependent Claim
26 words
The method as claimed in claim 1, wherein the drying step is carried out by passing the envelope, applied with the paint, through a heating furnace.
Claim 6
Dependent Claim
26 words
The method as claimed in claim 1, wherein the solvent is selected from the group consisting of trichloroethane, xylol, trol, butanol, toluene and a mixture thereof.
Claim 7
Dependent Claim
50 words
The method as claimed in claim 1, wherein the solvent is trichloroethane and the drying step is carried out for a length of time not shorter than 10 minutes at a temperature of not lower than 300° C. by passing the envelope, applied with the paint, through a heating furnace.
Claim 8
Dependent Claim
45 words
The method as claimed in claim 1, wherein the drying step is carried out by passing the envelope, applied with the paint, through an annealing furnace employed in the manufacture of the cathode ray tube for the removal of stresses built up in the envelop.
Claim 9
Dependent Claim
45 words
The method as claimed in claim 6, wherein the drying step is carried out by passing the envelope, applied with the paint, through an annealing furnace employed in the manufacture of the cathode ray tube for the removal of stresses built up in the envelope.
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) | 1991-12-13 | 1992-06-13 | 1992-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-13 | 1996-06-13 | 1996-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-13 | 2000-06-13 | 2000-12-13 | $7700.00 | Window Closed / Lapsed |