US3616539A
Expired / Lapsed
US
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Assignee: Bell and Howell Co
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Filing: 1969-02-03
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Granted: 1971-11-02
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Expires: 1989-02-03
Abstract
Abstract THE DISTANCE OF AN OPTICAL INSTRUMENT TO A SUBJECT IS DETERMINED ACCORDING TO THE PRINCIPLE OF TRIANGULATION BY THE POSITION OF A GRAVITY ORIENTABLE BALL, IN AN ARCUATE TRACK MOVABLE WITH THE INSTRUMENT, AND ARRANGED SO THAT AT EACH ANGLE OF INCLINATION OF ITS OPTICAL AXIS TO A HORIZONTAL BASE, A PREDETERMINED TRACK PART IS CLOSEST TO THE BASE. A SCALE OF INDICIA ALONG THE TRACK ENABLES READ-OUT OF DISTANCE ACCORDING TO THE POSITION OF THE BALL.
Inventors
- 👤 Richard K Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:29
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/10; G01C3/00; G01C3/02; G03; G03B; G03B13/00; G03B13/18; G03B13/20
Claims Analysis
Total Claims: 0
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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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |