US3643597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making screen printing articles
Assignee: LOUIS A LALA
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Filing: 1969-05-12
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Granted: 1972-02-22
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Expires: 1989-05-12
Abstract
Abstract A screen printing article and method of making the article includes using the fibers of the screen to divide the image to be printed into a plurality of dots, the size of each representing the density of the light passing through the screen. Since the fibers of the screen themselves are used to break up the image, each dot being thus created falls substantially centrally in the openings between the fibers. A photographic film is placed adjacent the screen, exposed to the image to be printed and developed. The screen is then coated with a sensitized emulsion, and exposed to light projected through the developed photographic film. The film and the unexposed emulsion are then removed to leave a plurality of openings in the screen, each centrally positioned between the fibers of the screen, through which ink may pass.
Inventors
- 👤 Louis A Lala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:30
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/12; B; B41; B41M; B41M1/00; B41M1/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
49 words
The method of claim 1 wherein said photographically sensitized layer is a photographic film, the method including the steps of adhering said film to said screen with an adhesive; wherein the step of developing said photographically sensitized layer includes developing said film while it is adhered to said screen.
Claim 2
Dependent Claim
98 words
The method of claim 1 including the steps of coating said screen with a clear transparent emulsion, and coating one surface of said screen with a photographic emulsion prior to projecting said image through said screen; wherein said step of developing said photographic sensitized layer includes developing said photographic emulsion while in place on said screen; thereafter applying to said clear transparent emulsion a sensitizing compound to photosensitize said emulsion; exposing said sensitized emulsion through said developed photographic emulsion; and wherein the step of removing said photographically sensitized layer occurs simultaneously with the washing of said sensitized emulsion.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein said projected image is a negative image and wherein a positive is formed on said photographically sensitized layer.
Claim 4
Independent Claim
112 words
A method of making a screen printing plate wherein each opening in the screen is centered between fibers forming the screen, including the steps of attaching a photographic film to said screen; projecting the image to be printed through said screen onto a photographic film, the fibers of said screen dividing said image into a plurality of dots on said film; developing said photographic film while it remains attached to said screen; coating said screen with a sensitized emulsion; projecting light through said developed photographic film onto said emulsion; and washing said emulsion to providing openings in said screen with each of said openings being centered between the fibers forming the screen.
Claim 5
Dependent Claim
25 words
The screen printing method of claim 5 wherein the size of each dot is a function of the intensity of the image at that location.
Claim 6
Dependent Claim
39 words
The method of claim 5, further including the step of separating said photographic film from said screen by a predetermined distance to control the formulation of the dots on said film when said image is projected through said screen.
Claim 7
Dependent Claim
31 words
The method of claim 5 further including the step of controlling the intensity of said image when projecting onto said photographic film to control the formation of dots on said film.
Claim 8
Independent Claim
124 words
The method of making a screen printing plate wherein each opening in said screen is centered between the fibers forming the screen, including the steps of coating said screen with a clear transparent emulsion; coating one surface of said screen with a photographic emulsion; projecting the image to be printed through said screen onto said photographic emulsion, the fibers of said screen dividing said image into a plurality of dots on said emulsion; developing said photographic emulsion; applying a photosensitizing substance to said clear emulSion to render it photosensitive; directing light through said developed photographic emulsion onto said sensitized emulsion; and washing said sensitized emulsion to provide openings in said screen with each of said openings centrally positioned between the fibers of the screen.
Claim 9
Independent Claim
141 words
A method of making a screen printing plate wherein each opening in said screen is centered between the fibers forming the screen, including the steps of projecting an image through said screen, onto a photographic film placed adjacent said screen, the fibers of said screen dividing said image into a plurality of dots on said film; identifying the original relationship between said film and said screen; removing said film, developing said film, and replacing said film in its original relation to said screen with the dots thus formed thereon aligned centrally between the fibers of said screen; coating said screen with a photosensitive emulsion; projecting light through said developed film onto said emulsion; removing said film; and washing said emulsion coated screen to provide openings in said screen with each of said openings being centered between the fibers forming the screen.
References Cited (Backward Citations)
US2209499A
Cited
US2500877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |