US3934503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stencil screens
Assignee: IIT Research Institute
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Filing: 1968-12-10
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Granted: 1976-01-27
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Expires: 1988-12-10
Abstract
Abstract A blank for forming a stencil screen for silk screen or electrostatic stencil printing is disclosed. The screen includes a resilient, high tensile strength, porous substrate such as a monofilamentary nylon or stainless steel 200-mesh screen. A light radiation absorbent, self-combustible, ink-resistant, ink-impervious and tough film is applied to the screen, suitably a combustible black nitrocellulose film or a black cellulose ether film containing finely dispersed nitrate or perchlorate. The film is selectively removed by directly pulsing high-intensity light of over 10 joules per square inch for a short duration of 1 to 50 milliseconds in the form of an image pattern to ignite and completely combust the film only in said areas during the duration of the pulse.
Inventors
- 👤 Layton C. Kinney
- 👤 Edwin H. Tompkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:05
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/24; B41N1/245; H; H05; H05K; H05K3/00; H05K3/0011; H05K3/0017
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A blank for forming a printing screen comprising in combination: a flexible, porous substrate having a high tensile strength and having openings which extend between opposite faces and of a size to permit passage of ink therethrough; a thin film on said substrate having high flexural and tensile strength, said thin film being uniform in cross section and including a combustible film former composed of an organic resin having a high percentage of hydrogen and carbon, a solid oxidizer uniformly dispersed throughout said film, and a fuel component, being resistant and impervious to said ink, said film being self-combustible, having a light-absorbing pigment in sufficient quantities per unit of surface area of said film to be ignitable and completely consumed in selected areas directly exposed to a high-intensity, short-duration pulse of light which raises the thin film to ignition threshold.
Claim 2
Dependent Claim
140 words
A blank for forming a printing screen comprising in combination: a flexible, porous substrate having a high tensile strength and having openings which extend between opposite faces and of a size to permit passage of ink therethrough; a thin film on said substrate having high flexural and tensile strength, said thin film being uniform in cross section and including a combustible film former composed of an organic resin having a high percentage of hydrogen and carbon, a solid oxidizer uniformly dispersed throughout said film, and a fuel component, being resistant and impervious to said ink, said film being self-combustible, having a light-absorbing pigment in sufficient quantities per unit of surface area of said film to be ignitable and completely consumed in selected areas directly exposed to a high-intensity, short-duration pulse of light which raises the thin film to ignition threshold.
Claim 3
Dependent Claim
27 words
A blank according to claim 1 in which said oxidizer is an alkali metal or ammonium compound of a member selected from nitrates, oxides, chlorates, perchlorate, peroxides.
Claim 4
Dependent Claim
22 words
A blank according to claim 1 in which the weight ratio of film former to oxidizer is from 1:4 to 4:1. pg,44
Claim 5
Dependent Claim
31 words
A blank according to claim 1 in which said film-forming binder is methyl cellulose, said ratio is 1:3 to 2:1 and said oxidizer is selected from ammonium perchlorate and potassium nitrate.
Claim 6
Dependent Claim
73 words
A printing screen blank comprising in combination: a mesh substrate having a mesh size of from 100 to 400 mesh, said substrate having high tensile and flexural strength and being woven from plastic or metal materials; and a light energy-absorbent, self-combustible thin film attached to said substrate comprising a film of a nitrocellulose containing about 10 to 12.3% by weight nitrogen and containing 10 to 20% by weight of a light absorbing pigment.
Claim 7
Dependent Claim
73 words
A printing screen blank comprising in combination: a mesh substrate having a mesh size of from 100 to 400 mesh, said substrate having high tensile and flexural strength and being woven from plastic or metal materials; and a light energy-absorbent, self-combustible thin film attached to said substrate comprising a film of a nitrocellulose containing about 10 to 12.3% by weight nitrogen and containing 10 to 20% by weight of a light absorbing pigment.
Claim 8
Dependent Claim
73 words
A printing screen blank comprising in combination: a mesh substrate having a mesh size of from about 100 to 400 meshes per linear inch, said substrate having high tensile and flexural strength; a light energy-absorbent, self-combustible 0.1- to 1-mil-thick film attached to said substrate comprising a lower alkyl cellulose ether containing an intimate dispersion of 10 to 20% by weight of carbon black and of an alkali metal or ammonium nitrate or perchlorate.
Claim 9
Dependent Claim
73 words
A printing screen blank comprising in combination: a mesh substrate having a mesh size of from about 100 to 400 meshes per linear inch, said substrate having high tensile and flexural strength; a light energy-absorbent, self-combustible 0.1- to 1-mil-thick film attached to said substrate comprising a lower alkyl cellulose ether containing an intimate dispersion of 10 to 20% by weight of carbon black and of an alkali metal or ammonium nitrate or perchlorate.
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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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |