Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 4912376 | Timed actuator for conventional wall switch A timed actuator moves the switch mechanism of a conventional wall switch. The actuator is detachably secured to the wall switch in abutting relation thereto. The actuator includes a small electric motor, a programmable timer, and several relays. Linkage,... | 03/27/1990 |
| 4631455 | Method and apparatus for converting a conventional internal combustion engine into a high speed electric motor and generator An electric starter motor and generator is integrated into the structure of an internal combustion engine by making the ferromagnetic pistons of the engine the relatively moving elements in the starter and generator. A coil is solenoidally wound around ea... | 12/23/1986 |
| 4617555 | Receiver for audible alarm A receiver to detect the audio tone emitted by an activated smoke alarm. The receiver employs an electret condenser microphone to monitor ambient sound. The output of the microphone is applied to an active band-pass filter and then to a PLL tone decoder. ... | 10/14/1986 |
| 4410852 | Angle-position transducer Angle-position is determined by relative angular rotation between a capacitive track and a capacitive pick-up probe. The capacitive track is disposed along the region of angular interest. The pick-up probe is oriented broadside to the capacitive track and... | 10/18/1983 |
| 4320293 | Angle-position transducer An angle-position transducer using light-interrogation employs an optical track and a beam of light. The light beam is formed into a narrow line-pattern. The line-pattern is directed to impinge on the optical track as the optical track moves angularly rel... | 03/16/1982 |
| 4312688 | Method and apparatus for making simulated stained-glass A method and apparatus for making simulated stained-glass uses an existing surface. An outline of a given design is traced or drawn on the surface to be decorated. Pressure-sensitive lead stripping is applied to the surface in registration with the outlin... | 01/26/1982 |
| 4286358 | Paper clip A clip to grip paper is adapted to carry advertising indicia. The clip comprises two cooperating gripping jaws. One or both of the jaws is formed with a thin planar land such that the land and jaw are formed as a single piece thereby monolithically to def... | 09/01/1981 |
| 4132296 | Shift lever and integral handbrake apparatus A shift assembly and integral handbrake apparatus for bicycles is comprised of a handbrake housing on which pivots a handbrake lever. The housing has an interior region formed with a cavity. A slot, defined by an extending flange, is formed on the housing... | 01/02/1979 |
| 4097968 | Clip A clip to detachably grip fabric is comprised of a generally planar member. The member is formed with fabric engaging means adapted to grip the fabric. The fabric engaging means is, preferably, in the form of a plurality of sharp prongs that extend from o... | 07/04/1978 |
| 4062341 | Patio wok stove A portable, gas fired Wok stove adapted particularly for outdoor cooking includes a vertically mounted outer cylinder. A heating chamber is suspended within the interior of the outer cylinder. One end of the heating chamber is open. A burner is carried in... | 12/13/1977 |
