Patent US3783779A successfully refreshed from Google Patents.
US3783779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary screen printing cylinder
Assignee: Hallmark Cards Inc
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Filing: 1971-05-20
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Granted: 1974-01-08
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Expires: 1991-05-20
Abstract
Abstract A rotary screen printing stencil is produced by etching techniques. A cylindrical base member is first provided with a layer of etchable material on the outer surface thereof. An etchresistant coating is provided over selected portions of the etchable material corresponding to the area surrounding the design to be printed and the grid pattern of the printing stencil. The etchable material is then removed in those areas thereof not protected by the etch-resistant coating. The resulting stencil having a foraminous design area with a grid pattern therein and an imperforate section surrounding the design area is then separated from the base member.
Inventors
- 👤 A Greenwood
- 👤 R Magee
- 👤 S Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:33
CPC Classifications
B; B41; B41C; B41C1/00; B41C1/14; B41C1/142; C; C25; C25D; C25D1/00; C25D1/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
A screen printing stencil for a rotary screen printing press and of the type having a foraminous design area presented by a grid pattern and an imperforate section surrounding the design area, said stencil comprising: a sheet of chemically etchable metal having a first metallic layer presenting an outwardly facing first surface, a discontinuous second metallic layer integral with said first layer and presenting an outwardly facing opposed second surface, and a plurality of ink passages connecting said first and second outwardly facing surfaces, said passages being characterized by outwardly opening, generally hemispherically shaped openings in said second layer, said openings extending inwardly through said second and first layers to communicate with generally planar openings in said first surface, said hemispherically shaped openings in said second surface being interconnected to facilitate the flow of ink thereacross, while said generally planar openings of said first surface are unconnected to substantially prevent ink flow thereacross.
Claim 2
Dependent Claim
153 words
A screen printing stencil for a rotary screen printing press and of the type having a foraminous design area presented by a grid pattern and an imperforate section surrounding the design area, said stencil comprising: a sheet of chemically etchable metal having a first metallic layer presenting an outwardly facing first surface, a discontinuous second metallic layer integral with said first layer and presenting an outwardly facing opposed second surface, and a plurality of ink passages connecting said first and second outwardly facing surfaces, said passages being characterized by outwardly opening, generally hemispherically shaped openings in said second layer, said openings extending inwardly through said second and first layers to communicate with generally planar openings in said first surface, said hemispherically shaped openings in said second surface being interconnected to facilitate the flow of ink thereacross, while said generally planar openings of said first surface are unconnected to substantially prevent ink flow thereacross.
Claim 3
Dependent Claim
58 words
A screen printing stencil as set forth in claim 1, wherein said first surface is characterized by a rectangular crosswork of elongated, continuous intersecting segments to present said grid pAttern, and said second surface is characterized by a plurality of posts opposite the points of intersection of said segments of material, said posts being generally diamond-shaped in cross-section.
Claim 4
Dependent Claim
21 words
A screen printing stencil as set forth in claim 1, wherein said first and second layers are composed of different metals.
Claim 5
Dependent Claim
27 words
A screen printing stencil as set forth in claim 3, wherein said first layer is composed of nickel, and said second ink-applying surface is composed of copper.
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |