US4705357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shadow mask having aperture occlusion prevention means
Assignee: Zenith Electronics LLC
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Filing: 1985-08-22
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Granted: 1987-11-10
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Expires: 2005-08-22
Abstract
Abstract A component-in-process for use in the manufacture of a color cathode ray tube comprises a shadow mask having a pattern of minute apertures for color selection the mask according to the invention has disposed on at least one side thereof a removable film effective to prevent particle occlusion of the apertures. The film according to the invention has an extremely small, substantially uniform thickness dimension, a low index of refraction, and is of such high transparency as to exhibit a negligible optical effect during photoscreening operations. An associated manufacturing method for a cathode ray tube is also disclosed.
Inventors
- 👤 Leonard Dietch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:45
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/14; H01J9/142; H01J2209/00; H01J2209/01; H01J2209/012; H01J2209/015
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
47 words
For use in the manufacture of a color cathode ray tube, a component-in-process comprising a shadow mask having a pattern of minute apertures for color selection, said mask having deposited on at least one surface thereof a removable film effective to prevent particle occlusion of said apertures.
Claim 2
Dependent Claim
47 words
For use in the manufacture of a color cathode ray tube, a component-in-process comprising a shadow mask having a pattern of minute apertures for color selection, said mask having deposited on at least one surface thereof a removable film effective to prevent particle occlusion of said apertures.
Claim 3
Dependent Claim
85 words
For use in the manufacture of a color cathode ray tube, a component-in-process comprising a shadow mask having a pattern of minute apertures for color selection, said mask having deposited on at least one surface thereof a removable film effective to prevent particle occlusion of said apertures, said film being characterized by having properties including an extremely small, substantially uniform thickness dimension, a low index of refraction, and a high transparency, said properties causing the film to exhibit a negligible optical effect during photoscreening operations.
Claim 4
Dependent Claim
85 words
For use in the manufacture of a color cathode ray tube, a component-in-process comprising a shadow mask having a pattern of minute apertures for color selection, said mask having deposited on at least one surface thereof a removable film effective to prevent particle occlusion of said apertures, said film being characterized by having properties including an extremely small, substantially uniform thickness dimension, a low index of refraction, and a high transparency, said properties causing the film to exhibit a negligible optical effect during photoscreening operations.
Claim 5
Dependent Claim
12 words
The film according to claim 1 wherein said removable film is pyrolyzable.
Claim 6
Dependent Claim
19 words
The film according to claim 1 wherein said thickness dimension is in the range of 4 to 6 micro-inches.
Claim 7
Dependent Claim
17 words
The film according to claim 1 wherein said film is deposited on both surfaces of said mask.
Claim 8
Dependent Claim
23 words
The film according to claim 1 wherein said film is characterized by having physically-related properties including non-flammability, static charge dispersibility, and dust rejection.
Claim 9
Dependent Claim
108 words
For use in the manufacture of a high-resolution color cathode ray tube, a component-in-process comprising a tensible foil shadow mask of less than 1 mil in thickness, and having for color selection a pattern of minute apertures approximately 0.0035 inch in diameter, said mask having deposited on at least one surface thereof a removable film effective to prevent particle occlusion of said apertures, said film being characterized by properties including an extremely small, substantially uniform thickness dimension in the range of 4 to 6 micro-inches, a low index of refraction, and a high transparency said properties causing the film to exhibit a negligible optical effect during photoscreening operations.
Claim 10
Dependent Claim
108 words
For use in the manufacture of a high-resolution color cathode ray tube, a component-in-process comprising a tensible foil shadow mask of less than 1 mil in thickness, and having for color selection a pattern of minute apertures approximately 0.0035 inch in diameter, said mask having deposited on at least one surface thereof a removable film effective to prevent particle occlusion of said apertures, said film being characterized by properties including an extremely small, substantially uniform thickness dimension in the range of 4 to 6 micro-inches, a low index of refraction, and a high transparency said properties causing the film to exhibit a negligible optical effect during photoscreening operations.
Claim 11
Dependent Claim
110 words
For use in the manufacture of a color cathode ray tube, a component-in-process comprising a shadow mask having a pattern of minute apertures for color selection, said mask having deposited on both surfaces thereof a removable film effective to prevent particle occlusion of said apertures, said film being characterized by having physically-related properties including non-flammability, static charge dispersibility, pyrolyzability, and dust rejection, said film being further characterized by having optically related properties including an extremely small, substantially uniform thickness dimension of 4 to 6 micro-inches, a low index of refraction, and a high transparency, said optically related properties causing the film to exhibit a negligible optical effect during photoscreening operations.
Claim 12
Dependent Claim
110 words
For use in the manufacture of a color cathode ray tube, a component-in-process comprising a shadow mask having a pattern of minute apertures for color selection, said mask having deposited on both surfaces thereof a removable film effective to prevent particle occlusion of said apertures, said film being characterized by having physically-related properties including non-flammability, static charge dispersibility, pyrolyzability, and dust rejection, said film being further characterized by having optically related properties including an extremely small, substantially uniform thickness dimension of 4 to 6 micro-inches, a low index of refraction, and a high transparency, said optically related properties causing the film to exhibit a negligible optical effect during photoscreening operations.
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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) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |