US3674372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for measuring position changes of two relatively movable members
Assignee: Carl Zeiss AG
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Filing: 1970-08-05
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Granted: 1972-07-04
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Expires: 1990-08-05
Abstract
Abstract THE INVENTION CONTEMPLATES MEANS USING A PHOTOELECTRIC SCANNING-GRATING OPTICAL SYSTEM TO MEASURE RELATIVE DISPLACEMENT, AS TRACKED BY RELATIVE MOVEMENT OF THE RESPECTIVE GRATING MEMBERS, AND UTILIZING MOVEMENT OF FRINGE LINES AS OCCASIONED BY GRATING-MEMBER MOVEMENT. THE INVENTION SO COMBINES FILTER DIAPHRAGM MEANS WITH THE GRATING SYSTEM, IN THE REGION OF SAID FRINGE LINES THEREOF, THAT THE PHOTOCELL OUTPUT SIGNAL, AS A FUNCTION OF GRATING DISPLACEMENT, CONTAINS ONLY THE FUNDAMENTAL WAVE OF THE DISTANCE PERIOD OR A SINGLE HARMONIC.
Inventors
- 👤 Adolf Weyrauch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:01
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/22; H03M1/24; H03M1/28; H03M1/30; G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36; G01D5/38
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |