Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 4090513 | Heat and moisture exchanging device for respiration A heat and moisture exchanging device for respiration comprising a housing, having an inlet detachably connected to a tracheal cannula and an outlet detachably connected to a tube for passing respiratory air, and a permeable heat and moisture exchange bod... | 05/23/1978 |
| 4078432 | Fibre optic pressure sensor A fibre optic pressure sensor which includes at least two lengths of optical fibre each one of which is secured to a surface of a separate one of a number of spaced-apart member, at least one of which is resilient, the optical fibres being situated in the... | 03/14/1978 |
| 4061035 | Diaphragm arrangement for pressure transducers A diaphragm arrangement for a pressure transducer, particularly one employed in monitoring an internal combustion engine and employing a force measuring transducer element abuts either against the pressure transducer directly or a preload element coupled ... | 12/06/1977 |
| 4056009 | Diaphragm arrangement for pressure transducers A diaphragm arrangement is provided for pressure measuring transducer devices wherein the diaphragm includes a structure of the flexible portions thereof permitting stable calibration and compensation of environmental conditions during measurements. In pa... | 11/01/1977 |
| 4052899 | Depthometer for underwater immersion A depthometer having an outer waterproof casing provided with a transparent wall through which a graduated dial is visible, an indicator element movable along said dial, and an actuating element for said indicator, this actuating element being responsive ... | 10/11/1977 |
| 4050314 | Pressure gauge A pressure gauge having a cup-shaped case closed by a transparent cover, through which a graduated scale and a pointer movable therealong are visible, the cover being mounted rotatably on the case in an axial fixed position with respect thereto.... | 09/27/1977 |
| 4048855 | Liquid level gauge particularly for motorcycle A petrol gauge for motorcycle is disclosed making use of the pressure existing at the bottom portion of the petrol tank. It comprises a display needle, the position of which depends on the position of a diaphragm of a pressure gauge device connectable wit... | 09/20/1977 |
| 4040298 | Gearless pressure or temperature gauge A pressure gauge comprising a diaphragm, a cylinder seat, and a driving helix movable up or down to constitute the operating elements. A rotary shaft with a pin fixed thereon rotates clockwise or counterclockwise responsive to the movement of the diaphrag... | 08/09/1977 |
| 4022190 | Apparatus for sensing pressure A pressure sensor apparatus primarily for sensing pressure in a body cavity such as the cranium, bladder or vena cava of an animal or human comprising a housing having a diaphragm dividing the interior of the housing into two chambers. A member containing... | 05/10/1977 |
| 4006735 | Pressure sensor apparatus A pressure sensor apparatus primarily for sensing pressure in a body cavity such as the cranium, bladder or vena cava of an animal or human comprising a housing having non-radioactive fluids contained in two spaced apart regions of the housing. A radioact... | 02/08/1977 |
| 4006639 | Temperature compensation for liquid filled pressure gauge The transparent crystal of a liquid filled pressure gauge casing is physically characterized by a controlled stiffness correlated to the volumetric temperature expansion coefficient of the fill liquid. By virtue of temperature induced expansion of the flu... | 02/08/1977 |
| 4004272 | Optical pressure switch A device for providing an optical indication of the pressure condition in a pressurized member, such as a pneumatic tire. A housing having a window therein carries a reflective surface, such as a mirror, which is mounted on a movable flap. One end of a pl... | 01/18/1977 |
| 3999437 | Pneumatic indicator The invention relates to a pneumatic indicator comprising a member or body and a transparent window behind which a spherical pivoting moving body can assume two distinct positions visible from the outside when the end of a lever placed in the member trans... | 12/28/1976 |
| 3998179 | Apparatus for operating a pressure gauge or the like A mechanism for operating an instrument such as, for example, a gauge primarily for measuring pressure having a diaphragm the opposite faces of which are subject to a pressure differential so that the center moves in response to such differential. The dia... | 12/21/1976 |
| 3990306 | Temperature compensated depth gauge for scuba diving A scuba diving oil filled depth gauge has a rigid or semi-rigid case that houses operative depth gauge elements. Outside pressure is communicated to the inside oil through a rolling diaphragm made of thin and highly flexible rubber-like material. The expa... | 11/09/1976 |
| 3949610 | Pressure indicator for railway cars In accordance with the present invention, a pressure indicator is mounted upon a railway car and is in communication with an opening into the pressure chamber of the car. The car may be, for example, a pressurized hopper car or a pressurized tank car. The... | 04/13/1976 |
| 3946607 | Apparatus for measuring chamber pressure A combustion chamber pressure measuring apparatus comprising a diaphragm pressure bulkhead assembly, pressure transmitting fluid, pressure transducer, and a telemetry section is disclosed for an end burning grain solid propellant rocket. This apparatus ... | 03/30/1976 |
| 3940991 | Barometer gas pressure measuring apparatus The invention relates to a gas pressure measuring apparatus having a gas-filled tank whose tank gas pressure acts from one side via an aperture in the tank wall on a movable part, more particularly a drop or column of liquid in a capillary, tube or the li... | 03/02/1976 |
| 3939758 | Pressure sensor A sensor particularly well suited for use in the monitoring of hydraulic pressure. The sensor includes a deformable membrane mechanically coupled to an electrical switch. The membrane is mounted within a chamber in a manner which permits free radial displ... | 02/24/1976 |
