Patent US3790788A successfully refreshed from Google Patents.
US3790788A
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US
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Line-follower
Assignee: BOC Group Ltd
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Filing: 1971-11-03
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Granted: 1974-02-05
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Expires: 1991-11-03
Abstract
Abstract A line-follower including two photoelectric cells able to be oscillated in unison transversely to the axis of the line being followed. One cell is arranged to produce a steering signal and the other an error-displacement signal.
Inventors
- 👤 Paul Frank Lister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:59
CPC Classifications
B; B23; B23Q; B23Q35/00; B23Q35/04; B23Q35/24; B23Q35/38; B23Q35/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A line-follower including first and second pendular-mounted photoelectric cells to scan the line being followed by being oscillated in unison transversely to the axis of the line being followed, and an optical system for each cell, in which the first cell is positioned to receive a focussed real image of the line being followed, and in which the second cell is positioned to receive a small unfocussed image of the line being followed.
Claim 2
Dependent Claim
73 words
A line-follower including first and second pendular-mounted photoelectric cells to scan the line being followed by being oscillated in unison transversely to the axis of the line being followed, and an optical system for each cell, in which the first cell is positioned to receive a focussed real image of the line being followed, and in which the second cell is positioned to receive a small unfocussed image of the line being followed.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |