US3754212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detection of label fouling in automatic railroad car identification system
Assignee: Shell USA Inc
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Filing: 1971-07-22
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Granted: 1973-08-21
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Expires: 1991-07-22
Abstract
Abstract Label fouling in an automatic railroad car identification system is detected in response to the intensities of signals from coded visible panels. The identifying panels are color coded, and failing of the panels can produce errors in reading the code. The ratio of intensity of a pair of primary colors in light reflected from a white strip in the panel is used as the measure of degree of fouling.
Inventors
- 👤 Der Most G Van
- 👤 A Borsboom
- 👤 Harten J Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:27
CPC Classifications
B; B61; B61L; B61L25/00; B61L25/02; B61L25/04; B61L25/041; G; G06; G06K; G06K7/00; G06K7/10; G06K7/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
203 words
An apparatus for the identification of a vehicle, incorporating an optical system for scanning a panel carrying a code in the form of colored strips, which panel is fixed to the vehicle, and for receiving light reflected from the panel, as well as a signal processing unit for decoding the reflected light, which signal processing unit is capable of producing from the light intensities of two primary colors A and B, for instance red and blue, analog and digital electric signals corresponding to those intensities, which apparatus comprises: a. an attenuator connected to the output for analog signals for color A of the aforementioned signal processing unit, b. a subtracting element, of which one input is connected to the output of said attenuator and the other input to the output for analog signals for color B of said signal processing unit, c. an and-gate, of which the two inputs are connected to the outputs for digital signals for the colors A and B of said signal processing unit, d. a switch element with two inputs, connected, respectively, to the output of said subtractiNg element and to the output of said and-gate, e. a warning device connected to the output of the switch element.
Claim 2
Independent Claim
203 words
An apparatus for the identification of a vehicle, incorporating an optical system for scanning a panel carrying a code in the form of colored strips, which panel is fixed to the vehicle, and for receiving light reflected from the panel, as well as a signal processing unit for decoding the reflected light, which signal processing unit is capable of producing from the light intensities of two primary colors A and B, for instance red and blue, analog and digital electric signals corresponding to those intensities, which apparatus comprises: a. an attenuator connected to the output for analog signals for color A of the aforementioned signal processing unit, b. a subtracting element, of which one input is connected to the output of said attenuator and the other input to the output for analog signals for color B of said signal processing unit, c. an and-gate, of which the two inputs are connected to the outputs for digital signals for the colors A and B of said signal processing unit, d. a switch element with two inputs, connected, respectively, to the output of said subtractiNg element and to the output of said and-gate, e. a warning device connected to the output of the switch element.
Claim 3
Dependent Claim
22 words
An apparatus according to claim 1, in which apparatus a delaying element is connected between the subtracting element and the switch element.
Claim 4
Dependent Claim
30 words
An aparatus according to claim 1, in which apparatus a delaying element is present in each of the lines from the outputs for analog signals of the signal processing unit.
Claim 5
Dependent Claim
68 words
An apparatus according to claim 1 in which apparatus the components mentioned in claim 4 under (a) to (e) are present in duplicate, one attenuator and one subtracting element being connected as indicated under (a) and (b), the other attenuator to the output for analog signals for color B and the other subtracting element to the output for analog signals for color A of the signal processing unit.
References Cited (Backward Citations)
US3201569A
Cited
US3225177A
Cited
US3502851A
Cited
US3553433A
Cited
US3571571A
Cited
US3596063A
Cited
US3617704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |