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 |
| 6762652 | Oscillating circuit, converter with such oscillating circuit, and preconditioner with such converter An oscillator for use in a preconditioner includes a rectifier, a converter receiving an input voltage and supplying an output voltage, and a control unit effecting peak current mode control. The oscillator has a switching frequency with a period dependent on the in... | 07/13/2004 |
| 5914067 | Microwave oven equipped with a structurally simple microwave generating apparatus A microwave oven includes a microwave generating apparatus having a cathode, a first grid for controlling the flow of electrons from the cathode, the first grid having holes for converting electrons from the cathode to the electron beams, a choke structur... | 06/22/1999 |
| 5883367 | Microwave oven equipped with a structurally simple apparatus for generating a microwave frequency energy A microwave oven includes a cooking chamber, a waveguide, and an apparatus for generating a microwave frequency energy. The apparatus includes a cathode for emitting electrons, a first grid for controlling and focusing the flow of electrons from the catho... | 03/16/1999 |
| 5883369 | Structurally simple apparatus for generating a microwave frequency energy An apparatus for generating a microwave frequency energy includes a cathode for emitting electrons, a first grid for controlling and focusing the flow of electrons from the cathode, a choke structure for serving as a capacitor, wherein the cathode, the fi... | 03/16/1999 |
| 5883368 | Microwave frequency energy generating apparatus provided with a voltage converting means An apparatus for generating a microwave frequency energy includes a cathode for emitting electrons, a first grid for controlling and focusing the flow of electrons from the cathode, a choke structure for serving as a capacitor, wherein the cathode, the fi... | 03/16/1999 |
| 5850074 | Microwave oven equipped with a microwave generating apparatus designed to reduce secondary electron emission A microwave oven includes a microwave generating apparatus having a cathode, a first grid for controlling the flow of electrons from the cathode. The first grid has holes for converting electrons from the cathode to the electron beams and a metal film for... | 12/15/1998 |
| 5841114 | Microwave oven equipped with a microwave output controlling apparatus A microwave oven includes a microwave generating apparatus having a cathode, a first grid for controlling the flow of electrons from the cathode, the first grid having holes for converting electrons from the cathode to the electron beams, a choke structur... | 11/24/1998 |
| 5121087 | Electronic resonator employing an FED resonator element An FED, modified with an electrostatically deformable anode, has a control network attached to electrodes thereof to switch the FED off as the anode is deformed by electrostatic force and switch the FED on as the anode returns to a quiescent state. Freque... | 06/09/1992 |
| 4260933 | Selective frequency optical generator An optical generator of an electrostatic field at light frequencies tuneable over the entire band of visible light frequencies including a pair of spaced electrodes in a gas filled tube having at least one absolute condenser plate adjacent one electrode, ... | 04/07/1981 |
