US4563612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube having antistatic silicate glare-reducing coating
Assignee: RCA Licensing Corp
•
Filing: 1984-06-25
•
Granted: 1986-01-07
•
Expires: 2004-06-25
Abstract
Abstract A cathode-ray tube comprising a glass viewing window having, on its external viewing surface, an antistatic, glare-reducing, image-transmitting coating. The coating has a rough surface and is composed essentially of a silicate material and a metallic compound in proportions to impart the desired antistatic characteristic without substantially degrading the image-transmitting capability of the coating. When the tube is operated, the coating is grounded either directly or through the metal implosion-prevention system on the tube.
Inventors
- 👤 Samuel B. Deal
- 👤 Donald W. Bartch
- 👤 Steven C. Forberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:40
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/28; H01J29/86; H01J29/867; H01J29/89; H01J29/896
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
64 words
A cathode-ray tube comprising a glass viewing window having, on its external viewing surface, an antistatic, glare-reducing image-transmitting coating, said coating having a rough surface for imparting said glare-reducing characteristics and consisting essentially of a silicate material which accumulates static charge during the operation of said tube, and an inorganic metallic compound present in operative concentrations for imparting said antistatic characteristic to said coating.
Claim 2
Dependent Claim
64 words
A cathode-ray tube comprising a glass viewing window having, on its external viewing surface, an antistatic, glare-reducing image-transmitting coating, said coating having a rough surface for imparting said glare-reducing characteristics and consisting essentially of a silicate material which accumulates static charge during the operation of said tube, and an inorganic metallic compound present in operative concentrations for imparting said antistatic characteristic to said coating.
Claim 3
Dependent Claim
27 words
The cathode-ray tube defined in claim 1 wherein said metallic compound comprises at least one element selected from the group consisting of platinum, palladium, tin and gold.
Claim 4
Dependent Claim
39 words
The cathode-ray tube defined in claim 2 wherein said metallic compound is present in said coating in sufficient concentration to impart said antistatic characteristic to said coating and insufficient concentration to degrade substantially said image-transmitting characteristic of said coating.
Claim 5
Dependent Claim
30 words
The cathode-ray tube defined in claim 2 wherein said silicate material is a silicate of at least one alkali metal selected from the group consisting of sodium, potassium and lithium.
Claim 6
Dependent Claim
16 words
The cathode-ray tube defined in claim 2 wherein said silicate material consists essentially of lithium silicate.
Claim 7
Dependent Claim
16 words
The cathode-ray tube defined in claim 5 wherein said metallic compound is a compound of palladium.
Claim 8
Dependent Claim
30 words
The cathode-ray tube defined in claim 6 wherein said palladium of said palladium compound is present in said coating in concentrations in the range of 0.005 to 0.020 weight percent.
Claim 9
Dependent Claim
23 words
The tube defined in claim 1 including contacting means to said coating for connecting said coating with an electrically-conducting path to ground potential.
Claim 10
Dependent Claim
24 words
The tube defined in claim 8 wherein said contacting means includes a metal implosion-prevention structure on said tube in physical contact with said coating.
Claim 11
Dependent Claim
24 words
The tube defined in claim 9 wherein said contacting means includes a tensioned metal band around said tube and said coating overlaps said band.
Claim 12
Dependent Claim
24 words
The tube defined in claim 9 wherein said contacting means includes a tensioned metal band around said tube and said band overlaps said coating.
References Cited (Backward Citations)
US3504212A
Cited
US3431454A
Cited
US3576356A
Cited
US3635751A
Cited
US3898509A
Cited
US3940511A
Cited
US4243913A
Cited
US4385256A
Cited
US4422721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |