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...that on Dec. 15, 1836, the Patent Office was completely destroyed by fire? Lost were some 7,000 models, 9,000 drawings, and 230 books plus all records of patent applications and grants.
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| Number | Title | Issue Date |
| 6397656 | System and method for detecting liquid serving as object to be detected in vessel using ultrasonic sensor An operating frequency setting unit outputs an ultrasonic emitting command to a variable oscillator circuit in an operating frequency setting mode to cause a detector to emit an ultrasonic wave a plurality of times while varying the frequency thereof. At ... | 06/04/2002 |
| 5646382 | Multiple push button switch assembly with multistage actuator interlock A push button switch provided with a multistage actuation interlock function is composed of a casing; a pair of push buttons arranged side by side passing through an upper lid of the casing; a plurality of movable bodies arranged movably in a direction pe... | 07/08/1997 |
| 5099408 | System for controlling a PWM inverter having delay time compensation A system is provided for controlling a PWM inverter having three main circuit arms in which free-wheel diodes are connected in parallel to positive and negative side switching elements. The inverter takes three phase alternating current from an intermedia... | 03/24/1992 |
