Patent US5436566A successfully refreshed from Google Patents.
US3665202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting objects
Assignee: British Steel Corp
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Filing: 1970-05-25
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Granted: 1972-05-23
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Expires: 1990-05-25
Abstract
Abstract In apparatus for detecting an object by scanning two parallel paths having means for producing signals from radiation sensed by the scanning, an improvement comprises means for inhibiting the signal producing means at the limits of the scans. The inhibiting means comprise a shutter mounted for movement in synchronism with the scanning.
Inventors
- 👤 Alexander D Mcleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:06
CPC Classifications
G; G01; G01B; G01B11/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
In apparatus for detecting an object comprising means for scanning two adjacent parallel paths, and radiation responsive means associated with said scanning means for sensing radiation from said two parallel paths and indicating said object defined thereby, said radiation responsive means comprising means for producing, in response to variations in the radiation along each of said paths, signals respectively associated with said paths, and means responsive to said signals for indicating the presence or absence of the object in each of said paths, aperture means positioned between said radiation responsive means and said scanning means, said aperture means having edge portions defining limits for the lengths of the scans of said two parallel paths sensed by said radiation responsive means, the improvement comprising means for inhibiting said radiation responsive means at and adjacent the limits of the scans of said paths defined by the edge portions of said aperture means.
Claim 2
Dependent Claim
150 words
In apparatus for detecting an object comprising means for scanning two adjacent parallel paths, and radiation responsive means associated with said scanning means for sensing radiation from said two parallel paths and indicating said object defined thereby, said radiation responsive means comprising means for producing, in response to variations in the radiation along each of said paths, signals respectively associated with said paths, and means responsive to said signals for indicating the presence or absence of the object in each of said paths, aperture means positioned between said radiation responsive means and said scanning means, said aperture means having edge portions defining limits for the lengths of the scans of said two parallel paths sensed by said radiation responsive means, the improvement comprising means for inhibiting said radiation responsive means at and adjacent the limits of the scans of said paths defined by the edge portions of said aperture means.
Claim 3
Dependent Claim
113 words
The apparatus of claim 1, wherein said scanning means comprise a movable mirror and drive means for moving the movable mirror to scan saId paths, and said inhibiting means comprise a radiation source, a radiation detector connected to receive radiation from said radiation source, a shutter mounted for movement by said drive means between said radiation source and said radiation detector in synchronism with the movement of said mirror to blank said radiation detector at the limits of the scans defined by said edge portions, and said radiation detector connected to said radiation responsive means to generate signal means in response to the blanking by said shutter to inhibit said radiation responsive means.
Claim 4
Dependent Claim
35 words
The apparatus of claim 2, wherein said mirror and said shutter are mounted for rotation by said drive means, said mirror being multi-sided and said shutter having vanes corresponding to the sides of said mirror.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |