Patent US3220549A successfully refreshed from Google Patents.
US3220549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for discriminating between desired and undesired documents
Assignee: VENDIT Inc
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Filing: 1964-06-08
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Granted: 1965-11-30
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Expires: 1984-06-08
Abstract
No abstract record available.
Inventors
- 👤 Lan J Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:43
CPC Classifications
G; G07; G07D; G07D7/00; G07D7/06; G07D7/12; G07D7/1205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
THE METHOD OF DISCRIMINATING BETWEEN DESIRED AND UNDESIRED DOCUMENTS BY SPECTRAL ANALYSIS OF LIGHT REFLECTED THEREFROM COMPRISING THE STEPS OF: EMITTING VISIBLE LIGHT IN A PLURALITY OF COLOR SECTIONS INCLUDING RESPECTIVE COLOR COMPONENTS EXISTING ON ONE SURFACE OF A DESIRED DOCUMENT; EXPOSING SAID ONE SURFACE OF A DOCUMENT TO BE INSPECTED TO SAID LIGHT WHILE HOLDING SAID DOCUMENT STATIONARY WITH RESPECT THERETO, AND REFLECTING SAID LIGHT FROM SAID ONE SURFACE; RECEIVING AT A PLURALITY OF LOCATIONS LIGHT RESPECTIVELY REFLECTED FROM A PLURALITY OF PRESELECTED SPACED-APART DISCRETE AREAS OF SAID ONE SURFACE, SAID AREAS BEING RELATIVELY SMALL COMPARED WITH THE TOTAL AREA OF SAID ONE SURFACE; DEVELOPING A PLURALITY OF ELECTRICAL SIGNALS HAVING AMPLITUDES RESPECTIVELY RESPONSIVE TO THE SPECTRAL CONTRNT OF SAID LIGHT RECEIVED FROM SAID DISCRETE AREAS; AND UTILIZING EACH OF SAID SIGNALS TO DEVELOP AN INDICATING SIGNAL WHEN THE SPECTRAL CONTENT OF EACH OF SAID AREAS CONFORMS TO THAT OF A DESIRED DOCUMENT.
Claim 2
Independent Claim
154 words
THE METHOD OF DISCRIMINATING BETWEEN DESIRED AND UNDESIRED DOCUMENTS BY SPECTRAL ANALYSIS OF LIGHT REFLECTED THEREFROM COMPRISING THE STEPS OF: EMITTING VISIBLE LIGHT IN A PLURALITY OF COLOR SECTIONS INCLUDING RESPECTIVE COLOR COMPONENTS EXISTING ON ONE SURFACE OF A DESIRED DOCUMENT; EXPOSING SAID ONE SURFACE OF A DOCUMENT TO BE INSPECTED TO SAID LIGHT WHILE HOLDING SAID DOCUMENT STATIONARY WITH RESPECT THERETO, AND REFLECTING SAID LIGHT FROM SAID ONE SURFACE; RECEIVING AT A PLURALITY OF LOCATIONS LIGHT RESPECTIVELY REFLECTED FROM A PLURALITY OF PRESELECTED SPACED-APART DISCRETE AREAS OF SAID ONE SURFACE, SAID AREAS BEING RELATIVELY SMALL COMPARED WITH THE TOTAL AREA OF SAID ONE SURFACE; DEVELOPING A PLURALITY OF ELECTRICAL SIGNALS HAVING AMPLITUDES RESPECTIVELY RESPONSIVE TO THE SPECTRAL CONTRNT OF SAID LIGHT RECEIVED FROM SAID DISCRETE AREAS; AND UTILIZING EACH OF SAID SIGNALS TO DEVELOP AN INDICATING SIGNAL WHEN THE SPECTRAL CONTENT OF EACH OF SAID AREAS CONFORMS TO THAT OF A DESIRED DOCUMENT.
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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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |