Patent US4632429A successfully refreshed from Google Patents.
US4632429A
Expired / Lapsed
US
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Method of rendering documents resistant to photocopying and anti-copying paper therefor
Assignee: NOCOPI Inc
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Filing: 1983-03-16
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Granted: 1986-12-30
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Expires: 2003-03-16
Abstract
Abstract A document has information appearing thereon, with at least a portion of the information being located on a front face of a portion of the document. The front face portion has a color with a sufficiently low reflection spectral response to render the document portion substantially incapable of being photocopied in an information-readable manner. The document portion is capable of transmitting visible light from the rear face to the front face to cause sufficient contrast between the relatively non-translucent information and the transmitted light to enable the information to be read by a human eye viewing the front face of the document when visible light is transmitted through the document from the rear face to the front face.
Inventors
- 👤 Norman A. Gardner
- 👤 Michael P. Voticky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:29
CPC Classifications
B; B41; B41M; B41M3/00; B41M3/14; G; G03; G03C; G03C5/00; G03C5/08; G03G; G03G21/00; G03G21/04; G03G21/043; G03G8/00; Y; Y10; Y10S; Y10S283/00; Y10S283/902; Y10S428/00; Y10S428/913; Y10S428/916; Y10S430/00; Y10S430/151; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/24876; Y10T428/24893; Y10T428/24901; Y10T428/24934; Y10T428/24942; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
145 words
A document having substantially non-translucent information appearing thereon, with at least a portion of the information being located on a front face of a portion of the document, said front face portion having a colour with a reflection spectral response which is effectively zero for light with a wavelength below about 625 millimicrons and less than about 1% up to about 1,000 millimicrons so as to render said document portion substantially incapable of being photocopied in an information-readable manner, and said document portion being capable of transmitting visible light from the rear face to the front face to cause sufficient contrast between the substantially non-translucent information and the transmitted light to enable the information to be read by a human eye viewing the front face of the document when visible light is transmitted through the document from the rear face to the front face thereof.
Claim 2
Dependent Claim
145 words
A document having substantially non-translucent information appearing thereon, with at least a portion of the information being located on a front face of a portion of the document, said front face portion having a colour with a reflection spectral response which is effectively zero for light with a wavelength below about 625 millimicrons and less than about 1% up to about 1,000 millimicrons so as to render said document portion substantially incapable of being photocopied in an information-readable manner, and said document portion being capable of transmitting visible light from the rear face to the front face to cause sufficient contrast between the substantially non-translucent information and the transmitted light to enable the information to be read by a human eye viewing the front face of the document when visible light is transmitted through the document from the rear face to the front face thereof.
Claim 3
Dependent Claim
22 words
A document according to claim 1 wherein said document portion has a transmission factor averaging about 3% in the visible light range.
Claim 4
Dependent Claim
39 words
A document according to claim 1 wherein said document portion has a transmission factor ranging from substantially zero for light with a wavelength of about 450 millimicrons to about 5% for light with a wavelength of about 700 millimicrons.
Claim 5
Dependent Claim
17 words
A document according to claim 1 wherein said information is of a substantially black substantially non-translucent colour.
Claim 6
Dependent Claim
22 words
A document according to claim 4 wherein said document portion has a transmission factor averaging about 3% in the visible light range.
Claim 7
Dependent Claim
33 words
A document according to claim 4 wherein said transmission factor ranges from substantially zero for light with a wavelength about 450 millimicrons to about 5% for light with a wavelength about 700 millimicrons.
Claim 8
Independent Claim
141 words
A method of rendering a document with information thereon resistant to photocopying, said method comprising applying substantially non-translucent information to a front face of a document, coloring said front face with a color with a reflection spectral response which is effectively zero for light with a wavelength below about 625 millimicrons and less than about 1% up to about 1,000 millimicrons so as to render the document substantially incapable of being photocopied in an information-readable manner, and said document being capable of transmitting visible light from a rear face to the front face to cause sufficient contrast between the substantially non-translucent information and the transmitted light to enable the information to be read by a human eye viewing the front face of the document when visible light is transmitted through the document from the rear face to the front face thereof.
Claim 9
Independent Claim
141 words
A method of rendering a document with information thereon resistant to photocopying, said method comprising applying substantially non-translucent information to a front face of a document, coloring said front face with a color with a reflection spectral response which is effectively zero for light with a wavelength below about 625 millimicrons and less than about 1% up to about 1,000 millimicrons so as to render the document substantially incapable of being photocopied in an information-readable manner, and said document being capable of transmitting visible light from a rear face to the front face to cause sufficient contrast between the substantially non-translucent information and the transmitted light to enable the information to be read by a human eye viewing the front face of the document when visible light is transmitted through the document from the rear face to the front face thereof.
Claim 10
Dependent Claim
22 words
A method according to claim 7 wherein said document portion has a transmission factor averaging about 3% in the visible light range.
Claim 11
Dependent Claim
39 words
A method according to claim 7 wherein said document portion has a transmission factor ranging from substantially zero for light with a wavelength of about 450 millimicrons to about 5% for light with a wavelength of about 700 millimicrons.
Claim 12
Dependent Claim
17 words
A method according to claim 7 wherein said information is of a substantially black substantially non-translucent colour.
Claim 13
Dependent Claim
22 words
A method according to claim 10 wherein said document portion has a transmission factor averaging about 3% in the visible light range.
Claim 14
Dependent Claim
33 words
A method according to claim 10 wherein said transmission factor ranges from substantially zero for light with a wavelength about 450 millimicrons to about 5% for light with a wavelength about 700 millimicrons.
Claim 15
Dependent Claim
132 words
Anti-photocopying paper having a front face having a colour with a reflection spectral response which is effectively zero for light with a wavelength below about 625 millimicrons and less than about 1% up to about 1,000 millimicrons so as to render the document substantially incapable of being photocopied in an information readable manner, after substantially non-translucent information has been typed or otherwise applied to said front face, and said paper being capable of transmitting visible light from a rear face to the front face to cause sufficient contrast between the substantially non-translucent information and the transmitted light to enable the information to be read by a human eye viewing the front face of the document when visible light is transmitted through the document from the rear face to the front face thereof.
Claim 16
Dependent Claim
132 words
Anti-photocopying paper having a front face having a colour with a reflection spectral response which is effectively zero for light with a wavelength below about 625 millimicrons and less than about 1% up to about 1,000 millimicrons so as to render the document substantially incapable of being photocopied in an information readable manner, after substantially non-translucent information has been typed or otherwise applied to said front face, and said paper being capable of transmitting visible light from a rear face to the front face to cause sufficient contrast between the substantially non-translucent information and the transmitted light to enable the information to be read by a human eye viewing the front face of the document when visible light is transmitted through the document from the rear face to the front face thereof.
Claim 17
Dependent Claim
21 words
Paper according to claim 13 wherein said document portion has a transmission factor averaging about 3% in the visible light range.
Claim 18
Dependent Claim
38 words
Paper according to claim 13 wherein said document portion has a transmission factor ranging from substantially zero for light with a wavelength of about 450 millimicrons to about 5% for light with a wavelength of about 700 millimicrons.
Claim 19
Dependent Claim
16 words
Paper according to claim 13 wherein said information is of a substantially black substantially non-translucent colour.
Claim 20
Dependent Claim
21 words
Paper according to claim 16 wherein said document portion has a transmission factor averaging about 3% in the visible light range.
Claim 21
Dependent Claim
32 words
Paper according to claim 16 wherein said transmission factor ranges from substantially zero for light with a wavelength about 450 millimicrons to about 5% for light with a wavelength about 700 millimicrons.
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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) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |