US3635751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithium silicate glare-reducing coating and method of fabrication on a glass surface
Assignee: RCA Licensing Corp
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Filing: 1969-04-03
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Granted: 1972-01-18
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Expires: 1989-04-03
Abstract
Abstract A novel optical screen comprises, as its viewing surface, a hard, abrasion-resistant coating having a rough, glare-reducing surface and composed of a lithium silicate material. The screen may be prepared by a novel method comprising: (a) warming the surface of a glass support to about 30* to 100* C., (b) coating the warm surface with an aqueous solution containing about 1 to 10 weight percent of a lithium-stabilized silica sol, (c) drying the coating, and then (d) heating the dry coating at about 150* C. to 450* C.
Inventors
- 👤 George E Long
- 👤 Francis D Grove
- 👤 Donald W Bartch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:24
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/896; C; C03; C03C; C03C17/00; C03C17/22; C03C17/34; C03C17/3411; C03C17/3417; C03C2217/00; C03C2217/20; C03C2217/28; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/113
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
19 words
The screen defined in claim 1 wherein said lithium silicate has an Si02:Li20 ratio of about 4:1 to 25:1.
Claim 2
Dependent Claim
14 words
A cathode-ray tube having a faceplate comprising the viewing screen defined in claim 2.
Claim 3
Dependent Claim
87 words
In a method for preparing an optical viewing screen having a glare-reducing viewing surface, the steps including a. warming the surface of a glass support to about 30* C. to 100* C., b. coating said surface with an aqueous solution containing about 1 to 10 weight percent of a lithium-stabilized silica sol, said sol having an Si02:Li20 ratio of about 4:1 to 25:1, c. drying said coating, d. and then heating said dry coating at about 100* C. to 450* C. for about 10 to 60 minutes.
Claim 4
Dependent Claim
25 words
The method defined in claim 4 wherein said glass support is the faceplate of a cathode-ray tube and said surface is the external surface thereof.
Claim 5
Dependent Claim
22 words
The method defined in claim 5 wherein said steps are carried out after said cathode ray tube has been evacuated and sealed.
Claim 6
Dependent Claim
21 words
The method defined in claim 5 wherein said steps are carried out before said cathode-ray tube has been evacuated and sealed.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |