US5300764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent optical identification label with infrared directivity
Assignee: NHK Spring Co Ltd
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Filing: 1992-01-27
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Granted: 1994-04-05
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Expires: 2012-01-27
Abstract
Abstract An optical identification label consisting of an area of hologram or diffraction grating which is transparent to visible light but reflects incident light with a specific reflective directivity. By identifying the reflectivity directivity, it is possible to identify the authenticity of the label and, hence, the object to which the identification label is affixed. The fact that the identification label is transparent to human eyes offers a strong discouraging effect on potential forgers. Further, the pattern of the reflected light may be used as means for encoding data.
Inventors
- 👤 Hidekazu Hoshino
- 👤 Itsuo Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:56
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/16; B; B42; B42D; B42D25/00; B42D25/30; B42D25/328
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
36 words
A transparent optical identification label, comprising a reflective layer which transmits visible light but reflects light of a certain wavelength other than visible light with a specific directivity that can be identified with optical identifying means.
Claim 2
Dependent Claim
36 words
A transparent optical identification label, comprising a reflective layer which transmits visible light but reflects light of a certain wavelength other than visible light with a specific directivity that can be identified with optical identifying means.
Claim 3
Dependent Claim
17 words
A transparent optical identification label according to claim 1, wherein said reflective directivity is given by hologram.
Claim 4
Dependent Claim
18 words
A transparent optical identification label according to claim 1, wherein said reflective directivity is given by diffraction grating.
Claim 5
Dependent Claim
29 words
A transparent optical identification label according to claim 1, wherein said reflective layer consists of alternating layers of at least two kinds of different materials having different refractive indices.
Claim 6
Dependent Claim
28 words
A transparent optical identification label according to claim 1, wherein said identification label is affixed to an object as means for preventing an unauthorized duplication of said object.
Claim 7
Dependent Claim
21 words
A transparent optical identification label according to claim 1, wherein data is encoded in a geometrical pattern of said reflected light.
References Cited (Backward Citations)
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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) | 1997-04-04 | 1997-10-04 | 1998-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-04 | 2001-10-04 | 2002-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-04 | 2005-10-04 | 2006-04-05 | $7700.00 | Window Closed / Lapsed |