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US 4,434,561 AGranted
Level indicator
OwnerMichael E. Gasparinventor
Life of this patent
Estimating the term…
Abstract
A device and method for locating two or more points on a horizontal plane is disclosed. The device emits an audio or visual signal when fluid in a tube reaches a designated level. When the signal is given, the fluid at the other end of the tube will be on the same horizontal plane, thereby enabling the user to locate points on the horizontal plane.
Claims5
A level indicator which comprises:
- A. A tube which is partially filled with fluid (,):
- B. A means for detecting a fluid level to which one end of said tube is attached and which comprises the following elements:
- i. A transistorized amplifier having a signal input terminal, a signal output terminal, a power supply terminal and a ground terminal;
- ii. An energy source connected to the power supply and ground terminals of said transistorized amplifier;
- iii. A first electrode, within said tube, connected to the signal input terminal of said transistorized amplifier;
- iv. A second electrode which would contact the fluid below the first electrode and would be connected to the ground terminal of said transistorized amplified;
- v. An electrically conductive fluid in said tube which would complete a circuit between the first and second electrodes when the fluid reaches the level of (the) a reference point marking;
- vi. An exterior surface on said means for detecting a fluid level;
- C. A signaling device connected to said signal output terminal and actuated by said means for detecting a fluid level;
- and
- D. A reference point marking on the exterior surface of said means for detecting a fluid level which aligns with the fluid level at the first electrode where said signaling device is actuated.
8 more elements
Dependencies are inferred from the claim text.