Patent US2471690A successfully refreshed from Google Patents.
US4780397A
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US
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Process for preparing film positive sheets for forging-by-copying-proof prints and prints therefrom
Assignee: Mitsumura Printing Co Ltd
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Filing: 1986-08-18
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Granted: 1988-10-25
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Expires: 2006-08-18
Abstract
Abstract There is provided a process for preparing a film positive sheet for a forging-by-copying-proof print in which a first background image sheet is placed on a first latent image sheet, an unexposed film having a photosensitive membrane on the undersurface is placed on the background sheet to provide a primary three-layer film structure, the three-layer film structure is illuminated to partially expose the film, the first latent image and background sheets are replaced by second latent image and second background sheets, respectively, to provide a secondary three-layer film structure, the secondary three-layer film structure is illuminated to completely expose the partially exposed film and the second latent image and background sheets are removed from the secondary three-layer structure to thereby provide a film positive sheet for a forging-by-copying-proof print.
Inventors
- 👤 Shohei Tsuchiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:21
CPC Classifications
B; B41; B41M; B41M3/00; B41M3/14; B41M3/146; G; G03; G03C; G03C5/00; G03C5/08; G03G; G03G21/00; G03G21/04; G03G21/043; Y; Y10; Y10S; Y10S283/00; Y10S283/902; Y10S430/00; Y10S430/153
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
A process for preparing a film positive sheet for a forging-by-copying-proof print comprising the steps of providing a latent image negative, placing a multi-line negative on the upper surface of said latent image negative, placing an unexposed film having a photosensitive membrane on the undersurface thereof on the upper surface of said multi-line negative to form a primary three-layer film structure, striking light from a light source against the undersurface of said primary three-layer film structure to partially expose said unexposed film so as to provide a primary film positive sheet, replacing said latent image negative by a latent image positive and said multi-line negative by a mesh negative, respectively, to form a secondary three-layer film structure, striking light from said light source against the undersurface of said secondary three-layer film structure to completely expose said partially exposed film and removing said latent image positive and mesh negative from said secondary three-layer film structure to thereby provide a film positive sheet for a forging-by-copying-proof print.
Claim 2
Dependent Claim
165 words
A process for preparing a film positive sheet for a forging-by-copying-proof print comprising the steps of providing a latent image negative, placing a multi-line negative on the upper surface of said latent image negative, placing an unexposed film having a photosensitive membrane on the undersurface thereof on the upper surface of said multi-line negative to form a primary three-layer film structure, striking light from a light source against the undersurface of said primary three-layer film structure to partially expose said unexposed film so as to provide a primary film positive sheet, replacing said latent image negative by a latent image positive and said multi-line negative by a mesh negative, respectively, to form a secondary three-layer film structure, striking light from said light source against the undersurface of said secondary three-layer film structure to completely expose said partially exposed film and removing said latent image positive and mesh negative from said secondary three-layer film structure to thereby provide a film positive sheet for a forging-by-copying-proof print.
Claim 3
Dependent Claim
162 words
A process for preparing a film positive sheet for a forging-by-copying-proof print comprising the steps of providing a latent image positive, placing a multi-line negative on the upper surface of said latent image positive, placing an unexposed film having a photosensitive membrane on the undersurface thereof on the upper surface of said multi-line negative to form a primary three-layer film structure, striking light from a light source against the undersurface of said primary three-layer film structure to partially expose said unexposed film to provide a primary film positive sheet, replacing said latent image positive by a latent image negative and said multi-line negative by a meseh negative, respectively, to form a secondary three-layer film structure, striking light from said light source against the undersurface of said secondary three-layer film structure to completely expose said partially exposed film and removing said latent image and mesh negatives from said secondary three-layer film structure to thereby provide a film positive sheet for a forging-by-copying-proof print.
Claim 4
Dependent Claim
162 words
A process for preparing a film positive sheet for a forging-by-copying-proof print comprising the steps of providing a latent image positive, placing a multi-line negative on the upper surface of said latent image positive, placing an unexposed film having a photosensitive membrane on the undersurface thereof on the upper surface of said multi-line negative to form a primary three-layer film structure, striking light from a light source against the undersurface of said primary three-layer film structure to partially expose said unexposed film to provide a primary film positive sheet, replacing said latent image positive by a latent image negative and said multi-line negative by a meseh negative, respectively, to form a secondary three-layer film structure, striking light from said light source against the undersurface of said secondary three-layer film structure to completely expose said partially exposed film and removing said latent image and mesh negatives from said secondary three-layer film structure to thereby provide a film positive sheet for a forging-by-copying-proof print.
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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) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |