US4025898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording representations of disrupted space patterns
Assignee: Individual
•
Filing: 1976-01-09
•
Granted: 1977-05-24
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Expires: 1996-01-09
Abstract
Abstract A method records the representations of disrupted space patterns such as fingerprints by generating phase frequency differences or moire representations of the image of the patterns or fingerprints which are converted to a waveform of electrical signals which are stored with or without further processing.
Inventors
- 👤 Lew Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:53
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/117; A61B5/1171; A61B5/1172; G; G06; G06V; G06V10/00; G06V10/10; G06V10/88; G06V40/00; G06V40/10; G06V40/12; G06V40/1365; G07; G07C; G07C9/00; G07C9/30; G07C9/32; G07C9/37
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
The method of recording a representation of a fingerprint comprising the steps of rotating through at least one complete rotation, a planar image of the fingerprint about an axis perpendicular to the planar image, generating Moire patterns of the planar image of the fingerprint during rotation, converting the Moire patterns to electrical signals, and storing representations of the electrical signals.
Claim 2
Independent Claim
60 words
The method of recording a representation of a fingerprint comprising the steps of rotating through at least one complete rotation, a planar image of the fingerprint about an axis perpendicular to the planar image, generating Moire patterns of the planar image of the fingerprint during rotation, converting the Moire patterns to electrical signals, and storing representations of the electrical signals.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the generating step comprises scanning the image of the pattern with a raster composed of a set of parallel lines.
Claim 4
Dependent Claim
37 words
The method of claim 1 wherein the generating step comprises optically superimposing another identical image of the fingerprint onto the image of the fingerprint and mutually rotating the images about an axis substantially perpendicular to their planes.
Claim 5
Dependent Claim
38 words
The method of claim 1 wherein the generating step comprises optically superimposing a planar array of regularly spaced lines on the image and mutually rotating the planar array and image about an axis substantially perpendicular to their planes.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein the representations of the electrical signals are digital values.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein the converting step includes a Fourier transformation on the electrical signals.
Claim 8
Dependent Claim
99 words
Apparatus for recording a representation of a fingerprint comprising supporting means for supporting the optical image of a fingerprint, a raster-driven image orthicon device aimed at the optical image of the fingerprint for generating electrical signals representing Moire patterns of the fingerprint, means for rotating the supporting means and the optical image of the fingerprint through at least 360° about an axis parallel to the optical axis of the image orthicon device, and storing means for storing representations of the electrical signals generated by the image orthicon device while the optical image of the fingerprint is rotated through 360°.
Claim 9
Dependent Claim
99 words
Apparatus for recording a representation of a fingerprint comprising supporting means for supporting the optical image of a fingerprint, a raster-driven image orthicon device aimed at the optical image of the fingerprint for generating electrical signals representing Moire patterns of the fingerprint, means for rotating the supporting means and the optical image of the fingerprint through at least 360° about an axis parallel to the optical axis of the image orthicon device, and storing means for storing representations of the electrical signals generated by the image orthicon device while the optical image of the fingerprint is rotated through 360°.
References Cited (Backward Citations)
US2646717A
Cited
US2964641A
Cited
US3292149A
Cited
US3511571A
Cited
US3510223A
Cited
US3599147A
Cited
US3604806A
Cited
US3759618A
Cited
US3740153A
Cited
US3876304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |