US3587289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical micrometer
Assignee: Plummer and Kershaw
•
Filing: 1969-07-03
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Granted: 1971-06-28
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Expires: 1989-07-03
Abstract
Abstract REFLECTING SURFACE, THEREBY PROVIDING A PRECISE AND ACCURATE INDICATION OF THE SIMULATED DISPLACEMENT OF THE TARGET. AN OPTICAL DEVICE IS DISCLOSED FOR CALIBRATING MEASURING INSTRUMENTS. THE DEVICE MAY BE USED, FOR EXAMPLE, TO CALIBRATE ELECTRONIC INSTRUMENTS FOR MEASURING VIBRATIONS OF A PHYSICAL BODY. THE DEVICE INCLUDES A PAIR OF REFLECTING SURFACES, WHICH MAY BE A PAIR OF TRIANGULAR PRISMS, ONE OF WHICH IS FIXED MOUNTED AND THE OTHER WHICH IS ADJUSTABLY MOVABLE RELATIVE TO THE FIRST FOR PRODUCING DISPLACEMENT OF THE IMAGE, THEREBY TO SIMULATE DISPLACEMENT OF A FIXED TARGET. A DIAL GAUGE PROVIDES A PRECISE INDICATION OF THE DISPLACEMENT OF THE SECOND
Inventors
- 👤 John L Plummer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:30
CPC Classifications
G; G01; G01P; G01P21/00; G01B; G01B11/00; G01B11/08; G01B11/10
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |