Automatic lighting device for salvage
Abstract
Abstract A LIGHTING DEVICE COMPRISES A CASING HAVING OPENINGS AT THE LOWER END PORTION THEREOF, THROUGH THE OPENINGS OF WHICH WATER ENTERS INTO THE CASING AS THE LIGHTING DEVICE FLOATS ON THE WATER WHILE REVEALING THE TOP PORTION THEREOF ABOVE THE SURFACE OF WATER, A DIAPHRAGM WATERTIGHTLY FIXED WITHIN THE CASING SO AS TO BE PUSHED UP BY THE WATER ENTERED THEREIN, AND AN ELECTRIC CIRCUIT INCLUDING A CONTACT ASSEMBLY FOR LIGHTING THE LIGHTING DEVICE TO BE SWITCHED ON BY MEANS OF THE DIAPHRAGM PUSHED UP. AROUND THE UPPER PORTION OF THE CASING AND ABOVE THE SURFACE OF THE WATER, THERE IS PROVIDED A MATERIAL PERMEABLE BY GAS BUT IMPERVIOUS TO WATER TO SEPARATE A SEALED INNER CHAMBER FROM THE OUTER AIR, AND THEREBY BALANCING THE INNER AIR PRESSURE WITH THE OUTER AIR PRESSURE THROUGH THE MATERIAL.
Inventors
- 👤 Kunio Shimizu
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |