Variable buoyancy control system
Abstract
Abstract A VARIABLE BUOYANCY CONTROL SYSTEM FOR AN UNDERWATER VEHICLE INCLUDING A BUOYANCY TANK, A MAIN FLUID PRESSURE LINE WHICH IS CONNECTED TO THE TANK, THE TANK, HAVING TOP AND BOTTOM BUTTERFLY VALVES, MEANS FOR SELECTIVELY OPENING AND CLOSING THE TOP AND BOTTOM BUTTERFLY VALVES, A FLOW CONTROL VALVE CONNECTED IN THE FLUID PRESSURE LINE FOR SELECTIVELY CONTROLLING THE FLUID PRESSURE TO THE TANK, A RELIEF VALVE MOUNTED IN THE BUOYANCY TANK FOR RELIEVING PRESSURE FROM THE TANK UPON THE OCCURRENCE OF POSITIVE PRESSURE DIFFERENTIAL OF THE TANK OVER AMBIENT, A SECONDARY FLUID PRESSURE LINE CONNECTED TO THE MAIN FLUID PRESSURE LINE ACROSS SAID FLOW CONTROL VALVE, AND A DEPTH COMPENSATOR VALVE CONNECTED IN THE SECONDARY FLUID PRESSURE LINE AND PRESSURE RESPONSIVE TO THE BUOYANCY TANK AND AMBIENT WATER FOR BY-PASSING FLUID TO THE BUOYANCY TANK UPON THE OCCURRENCE OF A NEGATIVE PRESSURE DIFFERENTIAL BETWEEN THE TANK AND AMBIENT. D R A W I N G
Inventors
- 👤 A Strickland
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |