US4303307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copy security system
Assignee: Individual
•
Filing: 1979-10-24
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Granted: 1981-12-01
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Expires: 1999-10-24
Abstract
Abstract A security system to prevent the unauthorized duplication of documents on standard electrostatic copiers. Paper substrates are coated with layers of carefully sized and spaced beads which break up the light emitted by a copier to a degree sufficient to preclude copying. In another embodiment, an original consisting of a paper substrate bonded to a reflective metalized film reflects light from the copier, and masks the image of any intelligence present on the substrate.
Inventors
- 👤 Al Tureck
- 👤 Theodore P. Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:55
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/04; G03G21/043; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B42; B42D; B42D25/00; B42D25/30; B42D25/36; B42D25/373; B32B2307/00; B32B2307/20; B32B2307/204; Y; Y10; Y10S; Y10S283/00; Y10S283/902; Y10S428/00; Y10S428/916
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
A copy-resistant document for precluding the unauthorized copying of said document on copying apparatus having light-producing elements and receiving elements for receiving light reflected from said document, said document comprising: a supporting substrate including a dielectric layer formed of an electrically non-conducting material; a plurality of generally spherical particles formed of an electrically conducting material embedded within said dielectric layer, said particles being operable to forwardly scatter light and divert the transmission of the reflected light away from said receiving elements, said particles being spherical and having a diameter of the order of 1.2 microns.
Claim 2
Dependent Claim
95 words
A copy-resistant document for precluding the unauthorized copying of said document on copying apparatus having light-producing elements and receiving elements for receiving light reflected from said document, said document comprising: a supporting substrate including a dielectric layer formed of an electrically non-conducting material; a plurality of generally spherical particles formed of an electrically conducting material embedded within said dielectric layer, said particles being operable to forwardly scatter light and divert the transmission of the reflected light away from said receiving elements, said particles being spherical and having a diameter of the order of 1.2 microns.
Claim 3
Dependent Claim
28 words
A copy-resistant document as described in claim 1, said particles being dispersed throughout the dielectric layer at a distance from 0.7 to 1 micron between their closest points.
Claim 4
Dependent Claim
103 words
A copy-resistant document for precluding the unauthorized copying of said document on copying apparatus having light-producing elements and receiving elements for receiving light reflected from said document, said document comprising: a supporting substrate including a dielectric layer formed of an electrically non-conducting material; a plurality of generally spherical particles formed of an electrically conducting material embedded within said dielectric layer, said particles being operable to forwardly scatter light and divert the transmission of the reflected light away from said receiving elements, said particles comprising spheres that are larger in diameter than the wavelength of incident light and spaced farther apart than said wavelength.
Claim 5
Dependent Claim
103 words
A copy-resistant document for precluding the unauthorized copying of said document on copying apparatus having light-producing elements and receiving elements for receiving light reflected from said document, said document comprising: a supporting substrate including a dielectric layer formed of an electrically non-conducting material; a plurality of generally spherical particles formed of an electrically conducting material embedded within said dielectric layer, said particles being operable to forwardly scatter light and divert the transmission of the reflected light away from said receiving elements, said particles comprising spheres that are larger in diameter than the wavelength of incident light and spaced farther apart than said wavelength.
Claim 6
Dependent Claim
123 words
A copy-resistant document for precluding the unauthorized copying of said document on copying apparatus having light producing elements and receiving elements for receiving light reflected from said document, said document comprising: a supporting substrate including a dielectric layer formed of an electrically non-conducting thermoplastic material, said thermoplastic material being bonded to a supporting layer, said thermoplastic material embedding therewithin a plurality of generally spherical particles formed of an electrically conducting material, said spherical particles having a diameter of the order of 1.2 microns and being dispersed throughout the dielectric layer at a distance from 0.7 to 1 micron between their closest points, said particles being operable to forwardly scatter the light and disrupt the transmission of the reflected light to the receiving elements.
Claim 7
Dependent Claim
123 words
A copy-resistant document for precluding the unauthorized copying of said document on copying apparatus having light producing elements and receiving elements for receiving light reflected from said document, said document comprising: a supporting substrate including a dielectric layer formed of an electrically non-conducting thermoplastic material, said thermoplastic material being bonded to a supporting layer, said thermoplastic material embedding therewithin a plurality of generally spherical particles formed of an electrically conducting material, said spherical particles having a diameter of the order of 1.2 microns and being dispersed throughout the dielectric layer at a distance from 0.7 to 1 micron between their closest points, said particles being operable to forwardly scatter the light and disrupt the transmission of the reflected light to the receiving elements.
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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |