US4212902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for aluminizing image display faceplates
Assignee: Zenith Electronics LLC
•
Filing: 1979-03-09
•
Granted: 1980-07-15
•
Expires: 1999-03-09
Abstract
Abstract This invention relates to improvements in the art of aluminizing the phosphor screens of image display devices such as television cathode ray picture tubes. An improved method comprises the application of a highly alkaline aqueous dispersion of a siliceous coating agent and a surfactant prior to aluminizing. The solution includes an acidic pH-lowering substance in an amount sufficient to adjust pH to a neutral range.
Inventors
- 👤 Hugo A. Lopez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:18
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
In a method for aluminizing an image-display faceplate having a phosphor deposit therein, the method being the type including: (a) applying an organic film on said faceplate, (b) applying an aluminum film to said organic film, and (c) baking out the organic film; an improvement which comprises: (d) rewetting said faceplate prior to step (a) with a solution comprising: (1) an aqueous colloidal dispersion of silica particles, said particles comprising about 0.5 to 1.5 weight-percent; (2) a nonionic surfactant comprising about 0.001 to 0.004 weight-percent; and, (3) an acidic pH-lowering substance in an amount sufficient to lower pH to about 6.2 to 7.8.
Claim 2
Dependent Claim
103 words
In a method for aluminizing an image-display faceplate having a phosphor deposit therein, the method being the type including: (a) applying an organic film on said faceplate, (b) applying an aluminum film to said organic film, and (c) baking out the organic film; an improvement which comprises: (d) rewetting said faceplate prior to step (a) with a solution comprising: (1) an aqueous colloidal dispersion of silica particles, said particles comprising about 0.5 to 1.5 weight-percent; (2) a nonionic surfactant comprising about 0.001 to 0.004 weight-percent; and, (3) an acidic pH-lowering substance in an amount sufficient to lower pH to about 6.2 to 7.8.
Claim 3
Dependent Claim
104 words
In a method for aluminizing an image-display faceplate having a phosphor deposit therein, the method being of the type including: (a) applying an organic film on said faceplate, (b) applying an aluminum film to said organic film, and (c) baking out the organic film; an improvement which comprises: (d) rewetting said faceplate prior to step (a) with a solution comprising: (1) an aqueous solution of potassium silicate, said potassium silicate comprising about 0.3 to 1.0 weight-percent; (2) a nonionic surfactant comprising about 0.01 to 0.02 weight-percent; and (3) an acidic pH-lowering substance in an amount sufficient to adjust pH to about 6.8 to 7.8.
Claim 4
Dependent Claim
104 words
In a method for aluminizing an image-display faceplate having a phosphor deposit therein, the method being of the type including: (a) applying an organic film on said faceplate, (b) applying an aluminum film to said organic film, and (c) baking out the organic film; an improvement which comprises: (d) rewetting said faceplate prior to step (a) with a solution comprising: (1) an aqueous solution of potassium silicate, said potassium silicate comprising about 0.3 to 1.0 weight-percent; (2) a nonionic surfactant comprising about 0.01 to 0.02 weight-percent; and (3) an acidic pH-lowering substance in an amount sufficient to adjust pH to about 6.8 to 7.8.
References Cited (Backward Citations)
US2696444A
Cited
US3099763A
Cited
US3920578A
Cited
US3591518A
Cited
US3679954A
Cited
US3752679A
Cited
US3940508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |