Photographic exposure measuring device
Abstract
Abstract A PHOTO-ELECTRIC EXPOSURE MEASURING DEVICE INCLUDES IN A HOUSING AN EXPOSED MEASURING CIRCUIT HAVING AN INDICATING DEVICE CONNECTED WITH A PHOTO SENSITIVE DEVICE INFLUENCED BY PREVAILING LIGHT CONDITIONS. A PLURALITY OF EXPOSURE FACTOR SETTNG DEVICES INFLUENCE A SUMMATION ELEMENT ROTATABLY MOUNTED ON THE HOUSING WHICH SUMMATION ELEMENT INFLUENCES THE INDICATION OF THE INDICATING DEVICE. THE SUMMATION ELEMENT IS PROVIDED WITH GUIDE MEANS ENGAGEABLE BY A LEVER FOR OPERATING A SWITCH. IN USE, THE MEASURING CIRCUIT IS CONNECTED TO A SOURCE OF SUPPLY PO- TENTIAL VIA THE SWITCH. THE SWITCH IS OPERATIVE VIA THE LEVER AND GUIDE MEANS AND DISCONNECTS THE SOURCE OF SUPPLY POTENTIAL WHEN THE COMBINATION OF EXPOSURE FACTOR SETTINGS ARE OUTSIDE THE RANGE OF THE MEASURING DEVICE.
Inventors
- 👤 Dieter Ambrosius
Bibliographic Details
Claims Analysis
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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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |