Floating roof drain
Abstract
Abstract THE METHOD AND APPARATUS FOR REMOVING LIQUID FROM A SUNKEN FLOATING ROOF OF A LIQUID STORAGE TANK. THE METHOD COMPRISES THE STEPS OF: WITHDRAWING LIQUID FROM BELOW THE SUNKEN FLOATING ROOF, AND SIPHONING LIQUID FROM ABOVE THE FLOATING ROOF TO BELOW THE FLOATING ROOF WHEN THE LIQUID LEVER OF THE TANK IS BELOW THE ACCUMULATED LIQUID ABOVE THE FLOATING ROOF. THE APPARATUS INCLUDES A GENERALLY INVERTED U-SHAPED SIPHON DRAIN HAVING FIRST AND SECOND UPSTANDING LEG PORTIONS CONNECTED TOGETHER AT THEIR RESPECTIVE UPPER ENDS BY A CONNECTING PORTION, THE BOTTOM END OF THE SECOND PORTION EXTENDS BELOW THE ROOF AND THE BOTTOM END OF THE FIRST PORTION IS POSITION ABOVE THE ROOF. A CHECK VALVE IS ATTACHED TO THE CONNECTION PORTION TO ALLOW TRAPPED AIR TO ESCAPE FROM THE PIPE ONLY IN A VERTICALLY UPWARD DIRECTION.
Inventors
- 👤 Robert B Wagoner
- 👤 John S Kinghorn
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 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 |