US5301981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copy preventing device and method
Assignee: Docusafe Ltd
•
Filing: 1992-10-29
•
Granted: 1994-04-12
•
Expires: 2012-10-29
Abstract
Abstract A copy preventing sheet-form screen comprises a lenticular screen formed by a sheet of transparent plastic material having, a series of adjacent lens portions with major optical axes perpendicular to the front face and a series of light blocking striae located spaced apart underlying respective lens portions. The striae extend across a major part of the major optical axes so that when covering a sheet printed with meaningful information, the screen enables the information to be easily seen when viewed obliquely in ambient white light but prevents a meaningful copy thereof being made by conventional, perpendicularly aligned, phototransference techniques. The screen can be attached to the printed sheet by adhesive or formed as an adhesive tape to cover only preselected areas of printing. The screen may also form one or both sides of a security envelope enclosing the printed sheet and sealed by a security label carrying an authorized signature.
Inventors
- 👤 Dov Nesis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:50
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/04; G03G21/043; Y; Y10; Y10S; Y10S283/00; Y10S283/902
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
123 words
A copy preventing sheet-form screen comprising a lenticular screen formed by a sheet of transparent material having front and rear faces and a series of adjacent lens portions with major optical axes perpendicular to the front face and a series of light blocking striae located spaced apart underlying respective lens portions and extending across a major part of their major optical axes so that positioning the copy preventing sheet-form screen with the rear face in covering relation to a sheet carrying indicia providing meaningful information, enables the information to be easily seen when viewed obliquely in ambient white light bu prevents a meaningful copy thereof being made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile.
Claim 2
Dependent Claim
123 words
A copy preventing sheet-form screen comprising a lenticular screen formed by a sheet of transparent material having front and rear faces and a series of adjacent lens portions with major optical axes perpendicular to the front face and a series of light blocking striae located spaced apart underlying respective lens portions and extending across a major part of their major optical axes so that positioning the copy preventing sheet-form screen with the rear face in covering relation to a sheet carrying indicia providing meaningful information, enables the information to be easily seen when viewed obliquely in ambient white light bu prevents a meaningful copy thereof being made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile.
Claim 3
Dependent Claim
16 words
A copy preventing sheet-form screen according to claim 1 in which the striae comprise dark bands.
Claim 4
Dependent Claim
16 words
A copy preventing sheet-form screen according to claim 1 in which the striae provide mirror surfaces.
Claim 5
Dependent Claim
29 words
A copy preventing sheet-form screen according to claim 1 in which the striae are applied to the rear face of the screen by one of printing and embossing processes.
Claim 6
Dependent Claim
31 words
A copy preventing sheet-form screen according to claim 1 including a layer of adhesive on the rear face and a backing sheet removably attached to the rear face, covering the adhesive.
Claim 7
Dependent Claim
22 words
A copy preventing sheet-form screen according to claim 1 in which the lens portions are formed by parallel ribs providing cylindrical segments.
Claim 8
Dependent Claim
24 words
A copy preventing sheet-form screen according to claim 6 in which the ribs are at a density of between 15 and 150 per cm.
Claim 9
Dependent Claim
21 words
A copy preventing sheet-form screen according to claim 7 in which the screen in made of PVC of 0.25 mm thickness.
Claim 10
Dependent Claim
33 words
A copy preventing sheet-form screen according to claim 8 in which the ribs forming the lens portions are at a density of 20 per cm and the striae are 0.25 mm in width.
Claim 11
Dependent Claim
129 words
A sheet of material carrying indicia providing meaningful information on a front face thereof covered by a copy preventing layer comprising a lenticular screen formed by a sheet of transparent material having front and rear faces and a series of adjacent lens portions with major optical axes perpendicular to the front face and a series of spaced apart, light blocking striae underlying perspective lens portions so as to extend across a major part of their major optical axes and alternating with striae of indicia providing the meaningful information so that the information is easily seen when the sheet is viewed obliquely in ambient white light but a meaningful copy thereof cannot be made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile.
Claim 12
Dependent Claim
129 words
A sheet of material carrying indicia providing meaningful information on a front face thereof covered by a copy preventing layer comprising a lenticular screen formed by a sheet of transparent material having front and rear faces and a series of adjacent lens portions with major optical axes perpendicular to the front face and a series of spaced apart, light blocking striae underlying perspective lens portions so as to extend across a major part of their major optical axes and alternating with striae of indicia providing the meaningful information so that the information is easily seen when the sheet is viewed obliquely in ambient white light but a meaningful copy thereof cannot be made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile.
Claim 13
Dependent Claim
15 words
A sheet of material according to claim 10 in which the striae provide mirror surfaces.
Claim 14
Independent Claim
136 words
A method of preventing a meaningful copy of information provided by a sheet of indicia being made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile, comprising the steps of providing a lenticular screen covering the indicia formed by a sheet of transparent material having front and rear faces and a series of adjacent lens portions with major optical axes perpendicular to the front face and a series of light blocking striae, located spaced, apart underlying respective lens portions so as to extend across a ma]or part of their optical axes so that the information is easily seen by viewing obliquely in ambient white light but a meaningful copy thereof cannot being made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile.
Claim 15
Independent Claim
136 words
A method of preventing a meaningful copy of information provided by a sheet of indicia being made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile, comprising the steps of providing a lenticular screen covering the indicia formed by a sheet of transparent material having front and rear faces and a series of adjacent lens portions with major optical axes perpendicular to the front face and a series of light blocking striae, located spaced, apart underlying respective lens portions so as to extend across a ma]or part of their optical axes so that the information is easily seen by viewing obliquely in ambient white light but a meaningful copy thereof cannot being made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile.
Claim 16
Dependent Claim
13 words
A method according to claim 12 in which the striae provide mirror surfaces
Claim 17
Dependent Claim
122 words
A copy preventing adhesive tape comprising a lenticular screen formed by a sheet of transparent material having front and rear faces and a series of adjacent lens portions with major optical axes perpendicular to the front face and a series of light blocking striae located spaced apart underlying respective lens portions and extending across a major part of their major optical axes so that positioning the copy preventing tape with the rear face in covering relation to a sheet carrying indicia providing meaningful information, enables the information to be easily seen when viewed obliquely in ambient white light but prevents a meaningful copy thereof being made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile.
Claim 18
Dependent Claim
122 words
A copy preventing adhesive tape comprising a lenticular screen formed by a sheet of transparent material having front and rear faces and a series of adjacent lens portions with major optical axes perpendicular to the front face and a series of light blocking striae located spaced apart underlying respective lens portions and extending across a major part of their major optical axes so that positioning the copy preventing tape with the rear face in covering relation to a sheet carrying indicia providing meaningful information, enables the information to be easily seen when viewed obliquely in ambient white light but prevents a meaningful copy thereof being made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile.
Claim 19
Dependent Claim
115 words
A copy preventing sheet-form screen comprising an optical screen including an array of adjacent, alternately arranged, first and second optical portions having respective major reflecting optical axis extending obliquely of and perpendicularly to the sheet-form screen, respectively, and an array of adjacent, alternately arranged, first and second striae of indicia forming meaningful information to be protected and other matter not to be protected, respectively, optically aligned with the first and second optical portions respectively, so that the information is easily seen when viewed obliquely in ambient white light but a legible copy of the meaningful information cannot be made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile.
Claim 20
Dependent Claim
115 words
A copy preventing sheet-form screen comprising an optical screen including an array of adjacent, alternately arranged, first and second optical portions having respective major reflecting optical axis extending obliquely of and perpendicularly to the sheet-form screen, respectively, and an array of adjacent, alternately arranged, first and second striae of indicia forming meaningful information to be protected and other matter not to be protected, respectively, optically aligned with the first and second optical portions respectively, so that the information is easily seen when viewed obliquely in ambient white light but a legible copy of the meaningful information cannot be made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile.
Claim 21
Dependent Claim
122 words
A copy preventing sheet-form screen comprising an optical screen including an array of adjacent, alternately arranged, first and second optical portions having respective major reflecting optical axes extending obliquely of and perpendicularly to the sheet-form screen, respectively, and an array of adjacent, alternately arranged, first and second transparent and light obstructing portions, respectively, optically aligned with the optical axes of the first and second optical portions respectively, so when the sheet-form screen is overlaid on a sheet covered by indicia forming meaningful information, the information is easily seen when viewed obliquely in ambient white light but a legible copy of the meaningful information cannot be made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile.
Claim 22
Dependent Claim
122 words
A copy preventing sheet-form screen comprising an optical screen including an array of adjacent, alternately arranged, first and second optical portions having respective major reflecting optical axes extending obliquely of and perpendicularly to the sheet-form screen, respectively, and an array of adjacent, alternately arranged, first and second transparent and light obstructing portions, respectively, optically aligned with the optical axes of the first and second optical portions respectively, so when the sheet-form screen is overlaid on a sheet covered by indicia forming meaningful information, the information is easily seen when viewed obliquely in ambient white light but a legible copy of the meaningful information cannot be made by conventional, perpendicularly aligned, phototransference techniques including at least one of xerographic, offset printing, and facsimile.
References Cited (Backward Citations)
US3151520A
Cited
US3178993A
Cited
US4498736A
Cited
US4557505A
Cited
US4912761A
Cited
US5071061A
Cited
US5197663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-11 | 1997-10-11 | 1998-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-11 | 2001-10-11 | 2002-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-11 | 2005-10-11 | 2006-04-12 | $7700.00 | Window Closed / Lapsed |