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!
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 5128972 | Memory package system Bidirectional transmission of write and read data is effected between a reader/writer unit and a memory module in a contactless manner using electromagnetic induction coupling. A single magnetic induction coupling apparatus is provided for each of the rea... | 07/07/1992 |
| 5101856 | Electromagnetic directional control valve A spool of a valve main body is switched and driven by exciting a solenoid coil by supplying a DC or AC voltage. An intensity of the magnetism generated by the excitation of the solenoid coil is detected by a magnetic sensor. When a predetermined sensor o... | 04/07/1992 |
| 5070500 | Memory package system utilizing inductive coupling between memory module and read/write unit The bidirectional transmission to write or read out data is executed between a read/write unit and a memory module by the contactless electromagnetic coupling using induction coils. A spread spectrum communication technique is used in at least the up tran... | 12/03/1991 |
| 5023788 | Control apparatus of working robot to flatten and finish the concreted floor A rotary trowel is provided for a working robot which can freely run and the concreted floor is flattened and finished by the rotary trowel while the robot runs on the concreted floor. The working robot is automatically operated in accordance with a zigza... | 06/11/1991 |
| 5023887 | Data transmission system using spread spectrum communication In response to a bit transfer request from one of two units, bit data is transmitted bit by bit from the other of the two units. The unit on the transmission side for transmitting the bit data has an M-series generator. In response to bit 1, a first M | 06/11/1991 |
| 4953590 | Electromagnetic directional control valve A spool of a valve main body is switched and driven by exciting a solenoid coil by supplying a DC or AC voltage. An intensity of the magnetism generated by the excitation of the solenoid coil is detected by a magnetic sensor. When a predetermined sensor o... | 09/04/1990 |
| 4932840 | Control apparatus of variable delivery pump A control load such as a cylinder or the like is driven at a constant speed by controlling the flow rate of a variable delivery pump. The control mode is switched to the pressure control to keep the stop pressure constant on the basis of an increase in pr... | 06/12/1990 |
| 4930992 | Control apparatus of variable delivery pump A control load such as a cylinder or the like is driven at a constant speed by controlling the flow rate of a variable delivery pump. The control mode is switched to the pressure control to keep the stop pressure constant on the basis of an increase in pr... | 06/05/1990 |
| 4886422 | Control apparatus of variable delivery pump A control load such as a cylinder or the like is driven at a constant speed by controlling the flow rate of a variable delivery pump. The control mode is switched to the pressure control to keep the stop pressure constant on the basis of an increase in pr... | 12/12/1989 |
| 4856177 | Automatic tool changer with electromagnetically readable tool holder having an electromagnetically coupling stopper for numerical control A tool holder is enclosed in a rack which is moved by a belt for automatic tool exchange. A stopper member provided for the rack is fitted into a positioning groove formed in a flange portion of the tool holder, thereby preventing the rotation of the hold... | 08/15/1989 |
| 4858133 | Drive management system Drive data such as vehicle velocity, engine rotational speed, and the like are recorded into a memory module in a state in which the memory module is attached to a vehicle. When drive management data is made, the memory module is detached from the vehicle... | 08/15/1989 |
| 4855729 | Communication control system of fluid control valve A plurality of terminal units are connected to the central unit by one optical fiber line in a loop form, thereby forming a communication link. The central unit converts the data including the terminal address and control bit into the serial optical signa... | 08/08/1989 |
| 4855994 | Memory package system for performing data transmission between memory module and write/read unit by electromagnetic induction coupling The bidirectional transmission for reading and writing data is performed between a write/read unit and a memory module using the contactless induction coupling of induction coils. The write/read unit frequency multiplexes a power source signal, a sync clo... | 08/08/1989 |
| 4724372 | Speed control apparatus of hydraulic actuator The driving speed of a hydraulic actuator is feedback controlled by adjusting an amount of fluid by a digital valve having a valve which is opened and closed by a pulse motor. For speed control, the deviation between a set speed of the actuator which is s... | 02/09/1988 |
| 4706703 | Fluid control valve A linear solenoid-type flow control valve with a valve element position feedback loop. An input consisting of an analog command signal is supplied in the form of a serial digital signal from a modulating transmitter through an optical fiber transmission l... | 11/17/1987 |
| 4703244 | Pulse motor control apparatus A frequency divided pulse is produced by frequency dividing a clock signal by speed instruction data. When the current position of the pulse motor has not yet reached a set desired position, a frequency divided pulse is outputted as a forward rotation con... | 10/27/1987 |
| 4682166 | Set point change-over circuit for fluid control valves A circuit for change-over of electric signal set points applied as control inputs to a fluid control valve for controlling the pressure or flow rate of a fluid. A priority circuit including a priority encoder or priority chain is provided in an input sect... | 07/21/1987 |
| 4561628 | Electromagnetically operated hydraulic actuator An electromagnetically driven hydraulic actuator for driving an electromagnetic valve for which a larger valve operating force is required. The pilot control valve and the actuator piston are enclosed within the stationary magnetic core of the electromagn... | 12/31/1985 |
| 4527283 | Character information separating apparatus for printed character reading systems An apparatus for a printed character reading system in which prior to the recognition process, the information obtained by reading the characters on a source document is separated line by line to obtain a line information and then, starting at its one end... | 07/02/1985 |
| 4488157 | Slot array antenna assembly Described is an antenna structure which reduces the side lobe level of a slot array antenna of the type using a dielectric plate as a director mechanism. A slot radiator is mounted on the vertical side of a member composed of metal plates and having a C-s... | 12/11/1984 |
| 4419572 | Check digit calculator There is provided a calculator for calculating check digits which are obtained from code numbers according to a modulus 10, modulus 11 or the like check. In accordance with one embodiment of the invention, the desired check digit original numerals are ind... | 12/06/1983 |
| 4298318 | Rotary valve for fluid motor or pump A rotary valve for changing the connections of the fluid inlet passages and the fluid outlet passages of a Gerotor type fluid rotary machine in which the fluid is contracted and expanded by a plurality of cavities defined by the teeth formed on a stator a... | 11/03/1981 |
| 4288337 | Lightweight materials having a high dielectric constant and their method of manufacture A lightweight mixed dielectric and a manufacturing method thereof is described, which is prepared by mixing metal-coated expanded particles of plastic, glass or silica, thin-wall metal pipes or metal coated thin-wall plastic pipes and uncoated expanded pa... | 09/08/1981 |
| 4272674 | Check digit calculator A calculator for calculating check digits which are obtained from code numbers according to a modulus 10, modulus 11 or similar check. In accordance with one embodiment of the invention, the desired check digit original numerals are indicated in response ... | 06/09/1981 |
| 4265173 | Numbering machine with check digit function There is disclosed a numbering machine designed so that code numbers as well as check digits each consisting of a single-place digit are printed by means of a mechanical mechanism. The check digits are printed by a check digit type wheel having an arrange... | 05/05/1981 |
| 4047175 | Television antenna directing and tracking system for television program network between air-borne and ground offices This invention relates to a television antenna directing and tracking system for directing a television repeating or relaying antenna mounted on an aircraft toward a ground station. The air-borne office is provided with a coordinate transforming device fo... | 09/06/1977 |
| 3949696 | Marine steering arrangement A marine steering arrangement wherein each of the starboard steering switch and port steering switch connected to a power source is closed upon receipt of an actuating signal resulting from a difference between an order signal of a rudder angle and an act... | 04/13/1976 |
