US3773541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for achieving a controlled gradient density coating on a light attenuation medium
Assignee: GTE Sylvania Inc
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Filing: 1972-02-07
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Granted: 1973-11-20
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Expires: 1992-02-07
Abstract
Abstract Process is disclosed for disposing a patterned light attenuating coating of a differential density on a substantially transparent optical medium, used in the optical system for photoforming the windowed interstitial web portion of a color cathode ray tube composite screen structure. The process utilizes a hermetic chamber wherein there is included a vaporizing source, a rotatable first pattern mask, a movable second pattern mask, support means for positioning the optical medium, and optical means for monitoring the deposition of coating thereon. The process achieves the deposition of a nonsymmetrical coating formed to modify the photo-exposure illumination from the photoexposure light source.
Inventors
- 👤 D Ng
- 👤 C Rehkopf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:00
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/04; C23C14/042; C23C14/044
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
54 words
The process for disposing a patterned light attenuating coating on a substantially transparent optical medium according to claim 1 wherein the rotation of said open first pattern mask is continued during the coating process, and wherein said open second pattern mask is maintained in a non-rotatable manner after insertion into said modified vapor beam.
Claim 2
Dependent Claim
62 words
The process for disposing a patterned light attenuating coating on a substantially transparent optical medium according to claim 1 wherein said second pattern mask is inserted into the vapor beam to further modify the same when a monitoring means in said apparatus indicates said optical medium to have a central area light transmission within the range of substantially 16 to 20 percent.
Claim 3
Dependent Claim
45 words
The process for disposing a patterned light attenuating coating on an optical medium according to claim 3 wherein the evaporation of said metal is continued until the central area light transmission of said optical medium is within the range of substantially 10 to 15 percent.
References Cited (Backward Citations)
US2341827A
Cited
US2160981A
Cited
US2384578A
Cited
US3117885A
Cited
US3442572A
Cited
US3503781A
Cited
US3561993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |