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US4717820A
Expired / Lapsed
US
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Device for detecting movable objects
Assignee: Individual
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Filing: 1985-04-02
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Granted: 1988-01-05
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Expires: 2005-04-02
Abstract
Abstract A device for detecting movable objects within a limited detection area comprises a number of juxtaposed photosemiconductors (A, B) on which an image of the detection area is adapted to impinge and which are uniformly distributed on branches (10, 11) of an electric bridge circuit, such that two juxtaposed photoresistors (A and B, respectively) are included in separate bridge branches (10 and 11, respectively). The bridge branches (10, 11) are connected to a rectifier (13) for generating an output signal.
Inventors
- 👤 Bert O. Jonsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:13
CPC Classifications
G; G01; G01V; G01V8/00; G01V8/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A device for detecting movable objects within a limited detection area, characterized in that the device comprises a number of photosemiconductors (A, B) each of the photosemiconductors being located adjacent at least two other photosemiconductors to define a detector surface and on which an image of the detection are is adapted to impinge and which are uniformly distributed on branches (10, 11) of an electric bridge circuit, such that two adjacent photosemiconductors (A and B, respectively) are included in separate bridge branches (10 and 11, respectively), and that the photosemiconductor bridge branches (10, 11) are connected to a rectifier (13) for generating an output signal.
Claim 2
Independent Claim
105 words
A device for detecting movable objects within a limited detection area, characterized in that the device comprises a number of photosemiconductors (A, B) each of the photosemiconductors being located adjacent at least two other photosemiconductors to define a detector surface and on which an image of the detection are is adapted to impinge and which are uniformly distributed on branches (10, 11) of an electric bridge circuit, such that two adjacent photosemiconductors (A and B, respectively) are included in separate bridge branches (10 and 11, respectively), and that the photosemiconductor bridge branches (10, 11) are connected to a rectifier (13) for generating an output signal.
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) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |