US3751250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for photoexposing a coated sheet prior to etching
Assignee: RCA Licensing Corp
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Filing: 1972-05-08
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Granted: 1973-08-07
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Expires: 1992-05-08
Abstract
Abstract A method for photoexposing a coated sheet in a vacuum printing frame employs at least one glass plate including a photographic master pattern in the central area thereof, and peripheral areas having surfaces that have been sandblasted, etched, or otherwise removed to a depth of at least 0.003 inch.
Inventors
- 👤 J Moscony
- 👤 R Kennard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:20
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/18; G03B27/20; G03F; G03F7/00; G03F7/20; G03F7/2002; G03F7/2014
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
73 words
positioning said sheet in a vacuum printing frame, said frame including at least one glass plate having a master pattern on the central area of a major surface of said plate, and a peripheral area around said central area, at least a portion of the surfaces of said peripheral area having been removed to a depth of at least 0.003 inch, said coated surface of said sheet being positioned opposite said master pattern.
Claim 2
Dependent Claim
24 words
The method defined in claim 1 wherein said master pattern is an array of metal coated areas, said array being less than 0.001-inch thick.
Claim 3
Dependent Claim
64 words
positioning said coated sheet between a matched pair of glass plates, each plate having on the major surface opposite said sheet a master pattern on the central area thereof and a peripheral area surrounding said pattern which is free of said master pattern, the major portion of said peripheral area having been sandblasted to a depth of between about 0.003 inch and 0.010 inch,
Claim 4
Dependent Claim
22 words
evacuating the volume between said plates so as to draw said plates into intimate contact with the major surfaces of said sheet,
Claim 5
Dependent Claim
19 words
The method defined in claim 1 wherein said surface portion of said peripheral areas has been removed by sandblasting.
Claim 6
Dependent Claim
14 words
evacuating said frame to draw said pattern into intimate contact with said coated surface,
Claim 7
Dependent Claim
10 words
exposing said coating to hardening radiation projected through said pattern
Claim 8
Dependent Claim
19 words
The method defined in claim 1 wherein said surface portion of said peripheral areas has been removed by etching.
Claim 9
Dependent Claim
10 words
exposing said coatings by projecting light through said master patterns,
Claim 10
Dependent Claim
9 words
bringing said evacuated volume back up to atmospheric pressure,
Claim 11
Dependent Claim
19 words
The method defined in claim 1 wherein said surface portion of said peripheral areas has been removed by grinding.
Claim 12
Dependent Claim
15 words
and then devacuating said frame and removing said pattern from contact with said coated surface.
Claim 13
Dependent Claim
13 words
In a method for making an apertured mask for a cathode-ray tube comprising
Claim 14
Dependent Claim
9 words
and then removing said sheet from between said plates.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |