US3836367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for photo-mechanical composition of designs on stencils for film and screen printing, particularly rotary screen printing
Assignee: Fritz Buser AG Maschinenfabrik
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Filing: 1972-04-06
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Granted: 1974-09-17
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Expires: 1992-04-06
Abstract
Abstract To improve the detail on screen printing, in which images are applied to a printing grid or screen in which a photo-sensitive layer is utilized to be exposed in accordance with the image or composition to be printed, and the non-exposed image portions are removed before printing, the screen is pre-processed to provide it with a smooth surface so that the photo-sensitive layer can, itself, be applied on the screen with a smooth surface of uniform and controllable thickness directly over the printing grid; in a preferred form, the interstices of the printing grid or screen are filled with a filler, and the surface of the grid and the filler is then treated to remove that portion of the filler which is above the grid elements, leaving the filler within the interstices, and a smooth surface over which the photo-sensitive layer can be applied. A plurality of such applications can be made, the photo-sensitive surface itself being exposed to form a lattice screen, which is treated to provide a smooth surface on which a further photo-sensitive layer which is to be exposed with the image, can then be applied.
Inventors
- 👤 M Klemm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:50
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
Method according to claim 1, wherein the support pattern is a raster and the first imaging step comprises imaging a raster on the first layer, developing and setting said raster to provide a base raster, said base raster forming the screen grid for said further photo-sensitive layer; and filling the spaces between the developed and set raster with a filler material to provide said level and smooth surface.
Claim 2
Dependent Claim
102 words
Method according to claim 1, wherein the support pattern is a raster and the first imaging step comprises imaging a first additional raster on the first layer which has a raster different from the raster of the grid; the exposure step comprises exposing the further layer by imaging a second additional raster on the further photo-sensitive layer, said second and first rasters being different from each other; developing and setting said first raster; and applying a further light-sensitive layer, as a smooth surface, with uniform controllable thickness over the first and second light sensitive layers, and after exposure, development, and setting thereof.
Claim 3
Dependent Claim
69 words
Method according to claim 1, wherein the step of filling the interstices comprises applying a filler material over one side of the prinTing grid, and penetrating the interstices between the lattice of the grid; and removing that portion of the filler material which extends over the printing grid to leave a smooth surface of grid lattice and intersticial filler material, the photo-sensitive layer being applied over said smooth surface.
Claim 4
Dependent Claim
211 words
Method to make stencils having a stencil layer or printing grids having interstices between the grid lattice thereof, in which a photo-sensitive layer is utilized to be exposed in accordance with an image to be composed or printed, the non-exposed image portions being removed before printing, the method comprising forming a level, smooth continuous composite surface of exposed grid lattice and a soluble filler located only in the interstices between the grid lattice, by filling only the interstices between the lattice grid with the filler; applying a continuous single first photo-sensitive layer of sufficient thickness to form the stencil directly over the smooth surface of the exposed grid lattice and the filler in the interstices between the lattice with constant, controllable thickness; exposing the first photo-sensitive layer with radiation in accordance with a first pattern and, without further treatment of the first photosensitive layer, applying a further layer of photo-sensitive material over said first photo-sensitive layer with constant and controllable thickness; exposing the further photo-sensitive layer with radiation in accordance with a second pattern; selectively removing a portion of the layer of photo-sensitive material in accordance with the patterns to which the layers were exposed to develop the exposed photo-sensitive layers; and thereafter removing all the filler material by a solvent.
Claim 5
Dependent Claim
33 words
Method according to claim 5, wherein the radiation pattern of the first pattern is a raster; and the further layer is utilized as the layer adapted to carry the image to be printed.
Claim 6
Dependent Claim
69 words
Method according to claim 5, wherein the step of filling the interstices comprises applying a filler material over one side of the printing grid, and penetrating the interstices between the lattice of the grid; and removing that portion of the filler material which extends over the printing grid to leave a smooth surface of grid lattice and intersticial filler material, the photo-sensitive layer being applied over said smooth surface.
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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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |