US4076426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for inspecting cathode-ray-tube window for objectionable cord
Assignee: RCA Licensing Corp
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Filing: 1976-06-29
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Granted: 1978-02-28
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Expires: 1996-06-29
Abstract
Abstract In inspecting a cathode-ray-tube window having a light-scattering inner surface, a pattern, which approximates the structure of the video images to be viewed through the window, is placed close to or against the inner surface. The pattern is observed through the window, and those local regions where the pattern appears to be distorted are identified.
Inventors
- 👤 Harvey Andrew Gross
- 👤 Harry Robert Frey
- 👤 John David Messner
- 👤 Raymond Frederick Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:11
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/8803; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/24; H01J9/00; H01J9/42
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
A method for inspecting a glass viewing window for a cathode-ray tube, said viewing window having a light-scattering inner surface, said window to be used for transmitting video images displayed on a luminescent viewing screen within said tube, said video images comprising a repetitive array of video image elements, said method comprising (a) providing a pattern of visually contrasting areas, which pattern approximates said array of image elements, (b) positioning said pattern adjacent said inner surface of said window, (c) observing said pattern through said window, (d) and identifying those local regions of said window where said pattern appears distorted.
Claim 2
Independent Claim
100 words
A method for inspecting a glass viewing window for a cathode-ray tube, said viewing window having a light-scattering inner surface, said window to be used for transmitting video images displayed on a luminescent viewing screen within said tube, said video images comprising a repetitive array of video image elements, said method comprising (a) providing a pattern of visually contrasting areas, which pattern approximates said array of image elements, (b) positioning said pattern adjacent said inner surface of said window, (c) observing said pattern through said window, (d) and identifying those local regions of said window where said pattern appears distorted.
Claim 3
Dependent Claim
17 words
The method defined in claim 1 wherein said pattern comprises an array of light-transmitting and light-opaque areas.
Claim 4
Dependent Claim
27 words
The method defined in claim 2 wherein said pattern is positioned against said inner surface, and light from a diffuse source is projected through said light-transmitting parts.
Claim 5
Dependent Claim
26 words
The method defined in claim 2 wherein said pattern is a photographic image supported on a transparent film generally conforming in shape to said inner surface.
Claim 6
Dependent Claim
17 words
The method defined in claim 1 wherein said pattern comprises an array of light-reflective and light-absorptive areas.
Claim 7
Dependent Claim
32 words
The method defined in claim 5 wherein said pattern is positioned against said inner surface and light is projected through said window and reflected by said light-reflective areas back through said window.
Claim 8
Independent Claim
123 words
A method for inspecting a glass viewing window for a cathode-ray tube, said window to be used for transmitting video images displayed on a luminescent viewing screen supported on the inner surface of said window, said inner surface having a stippled light-scattering surface and said viewing screen comprising a regular structure of image elements, said method comprising (a) providing a regular pattern of visually contrasting areas in repetitive array, which pattern approximates said structure of image elements, (b) positioning said pattern against said inner surface of said window, (c) illuminating said pattern, (d) scanning said illuminated pattern through said window, (e) and identifying those local portions of said window where said pattern appears to differ from being a regular pattern of visually-contrasting parts.
Claim 9
Independent Claim
123 words
A method for inspecting a glass viewing window for a cathode-ray tube, said window to be used for transmitting video images displayed on a luminescent viewing screen supported on the inner surface of said window, said inner surface having a stippled light-scattering surface and said viewing screen comprising a regular structure of image elements, said method comprising (a) providing a regular pattern of visually contrasting areas in repetitive array, which pattern approximates said structure of image elements, (b) positioning said pattern against said inner surface of said window, (c) illuminating said pattern, (d) scanning said illuminated pattern through said window, (e) and identifying those local portions of said window where said pattern appears to differ from being a regular pattern of visually-contrasting parts.
Claim 10
Dependent Claim
31 words
The method defined in claim 7 wherein said pattern is a repetitive array of light-transmitting and light-opaque parts which is illuminated by projecting light therethrough towards the means for said observing.
Claim 11
Dependent Claim
33 words
The method defined in claim 7 wherein said pattern is a repetitive array of light-reflective and light-absorptive parts which is illuminated by reflecting light from said pattern towards the means for said observing.
References Cited (Backward Citations)
FR1245488A
Cited
US3185022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |