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US4694218A Expired / Lapsed US ⏱️ 0.0 years remaining

Non-glaze coating for a cathode ray tube

Assignee: Cotek Co
•
Filing: 1986-01-13
•
Granted: 1987-09-15
•
Expires: 2006-01-13
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Abstract

Abstract A coating for reducing specular reflection on optical glass screens comprises a partially hydrolized metal alkoxide polymer. These alkoxides have the general formula M(OR) 4 where M is selected from the group consisting of silicon, titanium and zirconium where R is alkyl with 1 to 6 carbon. The equivalent titanium and/or zirconium oxides is about 15% of total solids by weight. A presently preferred coating mixture is prepared by dissolving tetraethyl orthosilicate in alcohol, at an elevated temperature; gradually adding a mixture of nitric acid and water; gradually adding titanium butoxide and/or zirconium n-propoxide; and, adding and mixing additional water and alcohol. The coating is applied by a method comprising the steps of cleaning the surface of the optical glass screen; preheating the glass screen; coating the solution onto the glass screen; and, baking the glass screen and solution, at a temperature high enough to drive off the solvent and bond the coating mixture to the glass surface.

Inventors

  • 👤 Paul Chao

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 22:18
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/25; G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/111; H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/896; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/212; C03C2217/213; C03C2217/22; C03C2217/23; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/113

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 77 words
In a cathode ray tube having an optical glass screen, the improvement wherein said optical glass screen is coated exteriorly with a mixture of a solid of partially hydrolized metal alkoxides, the metal alkoxides having the general formula M(OR) 4 where M is selected form the group consisting of silicon, titanium and zirconium, wherein the metal alkoxides comprise SiO 2 and ZrO 2 and wherein the SiO 2 forms approximately 85% of the solid mixture by weight.
Claim 2
Dependent Claim 77 words
In a cathode ray tube having an optical glass screen, the improvement wherein said optical glass screen is coated exteriorly with a mixture of a solid of partially hydrolized metal alkoxides, the metal alkoxides having the general formula M(OR) 4 where M is selected form the group consisting of silicon, titanium and zirconium, wherein the metal alkoxides comprise SiO 2 and ZrO 2 and wherein the SiO 2 forms approximately 85% of the solid mixture by weight.
Claim 3
Dependent Claim 49 words
A cathode ray tube according to claim 1, wherein the metal alkoxides comprise equivalent titanium and zirconium oxides, the equivalent titanium and zirconium oxides forming approximately 10% of the solid mixture, by molar ratio and wherein the SiO 2 forms approxiamtely 90% of the solid mixture, by molar weight.
Claim 4
Dependent Claim 33 words
A cathode ray tube according to claim 1, wherein the metal alkoxides comprise equivalent titanium and zirconium oxides, the equivalent titanium and zirconium oxides forming approximately 15% of the solid mixture, by weight.
Claim 5
Dependent Claim 42 words
A cathode ray tube according to claim 1, and a solution, the solution comprising an alcohol and water, the water having a molar ration of 1.3 to 1.6 to SiO 2 , the water being used for hydrolysis of M(OR) 4 .
Claim 6
Dependent Claim 29 words
A cathode ray tube according to claim 4 wherein the solid mixture comprises between 10% and 20% by weight and the solution comprises between 80% and 90% by weight.

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) 1990-09-14 1991-03-16 1991-09-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-09-14 1995-03-16 1995-09-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-09-14 1999-03-16 1999-09-15 $7700.00 Window Closed / Lapsed

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