US4684593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secure and self-verifiable image
Assignee: Secure Images Inc
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Filing: 1986-05-02
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Granted: 1987-08-04
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Expires: 2006-05-02
Abstract
Abstract A secure and self-verifiable image is formed by an array of image dots 30 on one side of a pellucid stratum or film 10 and a corresponding array of light-transmitting apertures 21 in a dark screen 20 on the other side of film 10, with image dots 30 being offset from the axes of apertures 21 so that the image is viewable only by light passing obliquely through film 10 at an angle that intersects arrayed apertures 21 and dots 30. Both apertures 21 and dots 30 occupy up to about 15% of the total area and the array spacing is at least 40 dots per centimeter. The reflective density of the interaperture regions of dark screen 20 is at least 1.6, and pellucid film 10 is at least 0.05 mm thick.
Inventors
- 👤 Ralph C. Wicker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:00
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/30; B42D25/309; B42D2033/04; B42D2033/08; B42D2033/14; B42D2033/22; B42D2035/06; B42D2035/14; B42D2035/20; Y; Y10; Y10S; Y10S283/00; Y10S283/904
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
145 words
A method of securing a self-verifiable image, said method comprising: a. forming said image as an array of uniformly spaced dots viewed through a dark screen having an array of apertures with the same uniform spacing as said dots; b. arranging said dot array and said aperture array to be spaced apart in parallel planes on opposite sides of a pellucid stratum; and c. offsetting the axes of said arrayed dots from the axes of said arrayed apertures and making said dots and apertures sufficiently small relative to the reflective density of said dark screen and the thickness of said pellucid stratum so that said image is not viewable by light passing perpendicularly through said dark screen and said pellucid stratum and is viewable only by light passing obliquely through said pellucid stratum at an angle that intersects said arrayed apertures and said arrayed dots.
Claim 2
Independent Claim
145 words
A method of securing a self-verifiable image, said method comprising: a. forming said image as an array of uniformly spaced dots viewed through a dark screen having an array of apertures with the same uniform spacing as said dots; b. arranging said dot array and said aperture array to be spaced apart in parallel planes on opposite sides of a pellucid stratum; and c. offsetting the axes of said arrayed dots from the axes of said arrayed apertures and making said dots and apertures sufficiently small relative to the reflective density of said dark screen and the thickness of said pellucid stratum so that said image is not viewable by light passing perpendicularly through said dark screen and said pellucid stratum and is viewable only by light passing obliquely through said pellucid stratum at an angle that intersects said arrayed apertures and said arrayed dots.
Claim 3
Dependent Claim
20 words
The method of claim 1 including forming said pellucid stratum of a resin film from 0.05 to 0.25 mm thick.
Claim 4
Dependent Claim
18 words
The method of claim 2 including forming said dark screen as a laminate secured to said resin film.
Claim 5
Dependent Claim
11 words
The method of claim 1 including forming said dark screen photographically.
Claim 6
Dependent Claim
25 words
The method of claim 1 including sizing said dots and said apertures to occupy up to about 15% of the total area of said image.
Claim 7
Dependent Claim
38 words
The method of claim 1 including making the uniform spacing of said dots and said apertures at least 40 per centimeter and using a reflective density for interaperture regions of said dark screen of at least about 1.6.
Claim 8
Dependent Claim
11 words
The method of claim 1 including forming said dots by printing.
Claim 9
Dependent Claim
10 words
The method of claim 1 including forming said dots photographically.
Claim 10
Dependent Claim
87 words
The method of claim 1 including forming said dark screen on a screen side of a resin film having a photographic emulsion surface on an image side, overlying said photographic emulsion surface with a photographic dark screen having the same arrayed apertures as said dark screen on said film so as to offset the apertures of said photographic dark screen from the apertures of said dark screen on said film, and imaging said photographic emulsion surface through the overlying photographic dark screen to form said arrayed dots.
Claim 11
Dependent Claim
22 words
The method of claim 9 including photographically forming both said dark screen on said resin film and said overlying photographic dark screen.
Claim 12
Dependent Claim
42 words
The method of claim 9 including forming said resin film from 0.05 to 0.25 mm thick, and forming said dots and said apertures of said dark screen on said film to occupy up to 10% of the total area of said image.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |