US3876465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for coating skirtless cathode ray tube panels
Assignee: Zenith Electronics LLC
•
Filing: 1973-03-12
•
Granted: 1975-04-08
•
Expires: 1993-03-12
Abstract
Abstract This disclosure depicts method and apparatus for applying a coating of phosphor or other CRT screen material to the concave inside surface of a curved skirtless cathode ray tube front panel. A panel is conveyed with its concave surface facing upwardly along a predetermined path through a liquid curtain of the coating material. The path along which the panel is conveyed is caused to have a curvature through the curtain which is so related to the curvature of the panel as to produce a high degree of uniformity in the coating received by the panel.
Inventors
- 👤 Iii Charles J Prazak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:22
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/30; B05C; B05C5/00; B05C5/002; B05C5/005; B05C7/00; B05C7/02; G; G03; G03F; G03F7/00; G03F7/16; G03F7/18; H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/221; H01J9/223; Y; Y10; Y10S; Y10S118/00; Y10S118/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
A METHOD FOR APPLYING A MATERIAL COATING TO THE CONCAVE INSIDE SURFACES OF A CURVED SKIRTLESS CATHODE RAY TUBE FRONT PANEL, COMPRISING: ESTABLISHING A LIQUID CURTAIN OF SAID COATING MATERIAL; AND CONVEYING SAID PANEL WITH ITS CONCAVE SURFACE FACING UPWARDLY ALONG A PREDERTERMINED PATH THROUGH SAID CURTAIN, SAID PATH BEING CAUSED TO HAVE A CURVATURE THROUGH SAID CURTAIN WHICH CORRESPONDS GENERALLY TO THE CURVATURE OF SAID PANEL SUCH THAT EACH CONSECUTIVE ELEMENTAL SURFACE AREA OF SAID PANEL MEETS THE CURTAIN AT AN ANGLE OF APPROX-
Claim 2
Independent Claim
85 words
A METHOD FOR APPLYING A MATERIAL COATING TO THE CONCAVE INSIDE SURFACES OF A CURVED SKIRTLESS CATHODE RAY TUBE FRONT PANEL, COMPRISING: ESTABLISHING A LIQUID CURTAIN OF SAID COATING MATERIAL; AND CONVEYING SAID PANEL WITH ITS CONCAVE SURFACE FACING UPWARDLY ALONG A PREDERTERMINED PATH THROUGH SAID CURTAIN, SAID PATH BEING CAUSED TO HAVE A CURVATURE THROUGH SAID CURTAIN WHICH CORRESPONDS GENERALLY TO THE CURVATURE OF SAID PANEL SUCH THAT EACH CONSECUTIVE ELEMENTAL SURFACE AREA OF SAID PANEL MEETS THE CURTAIN AT AN ANGLE OF APPROX-
Claim 3
Dependent Claim
25 words
The method as defined in claim 1 wherein said material to be applied to said panel surface consists of a slurry which includes phosphor particles
Claim 4
Dependent Claim
54 words
A method as set forth in claim 1 wherein said panel is conveyed in an attitude which is such that the angle formed between the curtain and the leading edge of each panel as it enters the curtain is not greater than 90.degree., thus preventing the leading edge of a panel from tearing said
Claim 5
Independent Claim
105 words
A method for depositing a slurry coating which includes phosphor particles and a photoresist material onto the concave inside surface of a curved, skirtless cathode ray tube front panel having a predetermined curvature in at least one plane, comprising: establishing a liquid curtain of said slurry; and conveying said panel through said curtain with its inside curved surface facing upwardly such that the direction of motion vector of said panel lies in said plane such that said curtain can contact consecutive elemental surface areas of said panel at substantially the same angle during the time the panel is conveyed through said curtain to deposit a
Claim 6
Independent Claim
105 words
A method for depositing a slurry coating which includes phosphor particles and a photoresist material onto the concave inside surface of a curved, skirtless cathode ray tube front panel having a predetermined curvature in at least one plane, comprising: establishing a liquid curtain of said slurry; and conveying said panel through said curtain with its inside curved surface facing upwardly such that the direction of motion vector of said panel lies in said plane such that said curtain can contact consecutive elemental surface areas of said panel at substantially the same angle during the time the panel is conveyed through said curtain to deposit a
Claim 7
Dependent Claim
53 words
The method as defined in claim 28 wherein each of said panel possesses a curved surface defined by a radius of curvature and wherein said path is defined by an arc through said curtain, said arch being defined by a radius generally equal to said radius of curvature of each of said panel.
Claim 8
Dependent Claim
54 words
A method as set forth in claim 4 wherein said panel is conveyed in an attitude which is such that the angle formed between the curtain and the leading edge of each panel as it enters the curtain is not greater than 90.degree., thus preventing the leading edge of a panel from tearing said
Claim 9
Dependent Claim
51 words
A method as set forth in claim 4 wherein said angle is substantially 90.degree. as measured between the curtain and a point on the upperly facing panel surface, which point lies on a line connecting the midpoint of the leading edge with the midpoint of the trailing edge of said panel.
References Cited (Backward Citations)
US771443A
Cited
US1200065A
Cited
US2745419A
Cited
US3132968A
Cited
US3242003A
Cited
US3345973A
Cited
US3365325A
Cited
US3341354A
Cited
US3364055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |