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Patent US3604899A successfully refreshed from Google Patents.
US3604899A
Expired / Lapsed
US
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Mark-detecting system
Assignee: Dennison Manufacturing Co
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Filing: 1970-02-12
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Granted: 1971-09-14
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Expires: 1990-02-12
Abstract
Abstract A mark-detection apparatus having a plurality of photodetectors for receiving light reflected from a plurality of points on an object such as a ticket and wherein a signal is generated representing the difference between the light detected by each of the photodetectors to indicate if a ticket has been altered.
Inventors
- 👤 John William Donohoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:57
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10851
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
102 words
A mark-detection system for a ticket reader or the like wherein the ticket used in the system includes an area for applying a mark thereto and an area where no marks are to be applied thereto, said system comprising first means for detecting light reflected from the area on the ticket where a mark is to be applied, second means for detecting light reflected from the area on the ticket where a mark is not normally applied, and third means responsive to signals from said first and second means for deriving a signal, indicating a difference in the amount of detected light.
Claim 2
Dependent Claim
102 words
A mark-detection system for a ticket reader or the like wherein the ticket used in the system includes an area for applying a mark thereto and an area where no marks are to be applied thereto, said system comprising first means for detecting light reflected from the area on the ticket where a mark is to be applied, second means for detecting light reflected from the area on the ticket where a mark is not normally applied, and third means responsive to signals from said first and second means for deriving a signal, indicating a difference in the amount of detected light.
Claim 3
Dependent Claim
47 words
A system according to claim 1 wherein said first and second means are arranged in a bridge circuit and wherein said third means is coupled across said bridge circuit to detect voltage changes across said first and second means as a result of changes in detected light.
Claim 4
Dependent Claim
16 words
A system according to claim 2 wherein means is provided to direct light against the ticket.
Claim 5
Dependent Claim
22 words
A system according to claim 1 including fourth means responsive to said signal for indicating that the ticket has a mark thereon.
Claim 6
Dependent Claim
29 words
A system according to claim 1 including ejection means responsive to said signal for ejecting a tiCket from the machine upon the detection of a mark on the ticket.
Claim 7
Dependent Claim
52 words
A mark-detection system comprising first means positioned to detect light from a plurality of different positions on an object, second means for comparing the amount of light detected from sad plurality of different positions on the object to generate a signal indicating a difference in detected light from said plurality of positions.
Claim 8
Dependent Claim
52 words
A mark-detection system comprising first means positioned to detect light from a plurality of different positions on an object, second means for comparing the amount of light detected from sad plurality of different positions on the object to generate a signal indicating a difference in detected light from said plurality of positions.
Claim 9
Dependent Claim
39 words
A system according to claim 6 wherein third means responsive to the signal is activated upon the detection of a mark placed on the object to permit the ticket to be removed from a group of tickets being read.
Claim 10
Dependent Claim
20 words
A system according to claim 7 wherein said third means comprises means for ejecting the object from the detection system.
Claim 11
Dependent Claim
13 words
A system according to claim 7 wherein said third means comprises error-indicating means.
Claim 12
Dependent Claim
27 words
A system according to claim 6 wherein said object comprises a ticket and wherein said means for comparing comprises an operational amplifier coupled to said second means.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |