Patent US4196015A successfully refreshed from Google Patents.
US4196015A
Expired / Lapsed
US
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Rewetting solution and method for aluminizing image display faceplates
Assignee: Zenith Electronics LLC
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Filing: 1978-08-18
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Granted: 1980-04-01
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Expires: 1998-08-18
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. A solution for rewetting a phosphor-bearing image display faceplate prior to aluminizing comprises a highly alkaline aqueous dispersion of a siliceous coating agent and a surfactant. The solution according to the invention 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
2026-11-09 05:54
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/28; C; C03; C03C; C03C17/00; C03C17/34; C03C17/3411; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2278; C03C2217/00; C03C2217/40; C03C2217/43; C03C2217/46; C03C2217/47; C03C2217/475; C03C2217/478
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A solution for rewetting a phosphor-bearing image display faceplate prior to aluminizing consisting essentially of: (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 adjust pH to about 6.2 to 7.8.
Claim 2
Dependent Claim
61 words
A solution for rewetting a phosphor-bearing image display faceplate prior to aluminizing consisting essentially of: (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 adjust pH to about 6.2 to 7.8.
Claim 3
Dependent Claim
13 words
The solution according to claim 1 wherein the pH-lowering substance is acetic acid.
Claim 4
Dependent Claim
61 words
A solution for rewetting a phosphor-bearing image display faceplate prior to aluminizing consisting essentially of (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 5
Dependent Claim
61 words
A solution for rewetting a phosphor-bearing image display faceplate prior to aluminizing consisting essentially of (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 6
Dependent Claim
13 words
The solution according to claim 3 wherein the pH-lowering substance is acetic acid.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |