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| Number | Title | Issue Date |
| 5224108 | Method and apparatus for call control signaling To perform call control signaling between a user and a telecommunications switching network (and end-to-end between users), a portion of the multiplex overhead of a multiplexed data stream is formatted so that it includes the call control signaling. This ... | 06/29/1993 |
| 5222120 | Long distance telephone switching system with enhanced subscriber services A long distance telephone switching system is adapted to provide various enhanced subscriber services, such as an audio news and information service, conference calling, voice messaging, message storage and forwarding, and speed dialing, in addition to co... | 06/22/1993 |
| 5187740 | Method and apparatus for telephone call reorigination The invention is an adaptive method and apparatus for telephone call reorigination (i.e., the placement of successive calls without extended re-dialing). It allows shorter, uniform DTMF reorigination requests or commands to be recognized and responded to ... | 02/16/1993 |
| 4933869 | Programmable threshold data detection system A threshold detection circuit is provided for determining when a data input signal exhibits an amplitude which exceeds a first programmable threshold level, is less than a second programmable threshold level or between the first and second levels. Respect... | 06/12/1990 |
| 4926375 | Multiple nodes broadcast communication method with receiver identification by bit position in transferred massage A data sharing mechanism employs a broadcast bus communication system to physically interconnect various control and monitoring nodes that cooperate in controlling a physical process. Shared, or global, variables are exchanged between connected nodes via ... | 05/15/1990 |
| 4872136 | Programmable controller input/output communications system The invention disclosed is useful in an I/O system of a programmable controller and provides a method and circuitry by which control and diagnostic information is exchanged between a control unit of an I/O module and a plurality of input/output points the... | 10/03/1989 |
| 4870564 | Distributed input/output system The invention disclosed provides an intelligent input/output system for a programmable controller and includes a plurality of input/output (I/O) modules, each of which may be located in proximity to the process being controlled. Each module is interconnec... | 09/26/1989 |
| 4865560 | Apparatus for removably connecting first and second matable members A connecting apparatus is provided for removably attaching a first member to a second member. The first and second members include respective mating surfaces which mate with each other. A pivot arm is situated adjacent one end of the mating surface of the... | 09/12/1989 |
| 4840586 | Keying apparatus for connecting a printed wiring assembly to a backplane structure A keying apparatus is provided including a key support structure having a plurality of protrusions which mate with a corresponding plurality of recesses formed in an edge surface of a printed wiring assembly. The key support structure includes a mechanism... | 06/20/1989 |
| 4799052 | Method for communicating data on a communication network by token passing A method of determining access on an electronic serial bus by implicit token passing. The serial bus receives and transmits data between a plurality of devices. Each device has a receiver for receiving data to the serial bus, a transmitter for transmittin... | 01/17/1989 |
| 4752886 | Method for on-line testing of load control circuitry and the associated load A method is disclosed for determining the operability of a switching device controlling an electrical load and the status of the load as open, shorted, or normally connected, without disruption of the operative state of the load. The method includes the s... | 06/21/1988 |
| 4722135 | Apparatus for placing surface mounting devices on a printer circuit board The disclosed invention provides manually operated apparatus for precise placement of surface mounting integrated circuit devices on a printed circuit board. A dispensing unit operates to position a device into an oriented, predetermined position with res... | 02/02/1988 |
| 4680519 | Recursive methods for world-to-joint transformation for a robot manipulator A method for controlling an articulated robot manipulator with an offset wrist made with only rotary joints. The method relates to transforming a given position and orientation of the robot tool or end effector in Cartesian space to the equivalent joint a... | 07/14/1987 |
| 4648028 | Color enhanced display for a numerical control system Color is added to the standard video display (18) of a computer numerical control system for controlling the operation of a machine tool (10) in the performance of specified operations with respect to a workpiece. Color assignment records (62) are include... | 03/03/1987 |
| 4628397 | Protected input/output circuitry for a programmable controller Input/output circuitry is disclosed for use in an I/O system of a programmable controller. The circuitry is protected against overcurrents without the use of fuses or circuit breakers, and is automatically restored to normal operation following correction... | 12/09/1986 |
| 4606001 | Customized canned cycles for computer numerical control system A method for defining and executing customized canned cycles for a numerically controlled machine in which the end user or original equipment manufacturer can define a sequence of actions or tasks to do precisely what a particular application warrants. Th... | 08/12/1986 |
| 4593380 | Dual function input/output for a programmable controller The invention disclosed provides circuitry which is selectively operable either as an input point or as an output point in a programmable controller having multiple input and output points for exchanging signals between a central processing unit (CPU) of ... | 06/03/1986 |
| 4580225 | Method for producing multiple entry threads A method is disclosed for machining multiple entry threads on a workpiece. The preferred steps of the method are preferably carried out in conjunction with a computer-based numerical control system. The method includes the steps of: determining the angula... | 04/01/1986 |
| 4573139 | System for position sensing transducers An interfacing system for selectably interfacing signals to a computer, or other control apparatus such as a numerical control system, from either of alternative transducers which provide position indicative signals differing in format. A system according... | 02/25/1986 |
| 4562392 | Stylus type touch probe system A non-cutting tool or stylus (32), mounted in a position where a tool normally resides on a turret (26) of a numerically controlled machining system, rubs against the workpiece (41) as it rotates. The rubbing vibrations emanating from the workpiece (41) a... | 12/31/1985 |
| 4554495 | Datum reference for tool touch probe system A reference post assembly (50) directly mounted on a numerically controlled machining system such as a lathe obviates the need for a datum ring including reference datum surfaces (42,44) and being conventionally provided on the external cylindrical surfac... | 11/19/1985 |
| 4520299 | Turning speed controller for electric vehicles having dual drive motors The invention disclosed provides a control system for an electric vehicle which automatically slows the vehicle during a turn and causes it to be increasingly slowed as the sharpness of the turn increases. The invention includes means for regulating the f... | 05/28/1985 |
| 4514814 | Multi-processor axis control A method for operating a computer controlled industrial machine in which a plurality of axes of motion are independently controlled. The method utilizes programmable data processors to enable the production of motion command signals to the servo drives of... | 04/30/1985 |
| 4514677 | Two stage electrical braking for a variable speed AC induction motor A two-stage electrical braking system for a variable speed alternating current induction motor powered from a variable frequency, variable voltage power source utilizes capacitance connected across a primary winding of the motor in a first stage of brakin... | 04/30/1985 |
| 4513379 | Customization window for a computer numerical control system A bidirectional communications link, termed a customization window, comprises a series of routines including functions, procedures and status flags implemented in software, interfaced between a machine control logic (MCL) operating to control the auxiliar... | 04/23/1985 |
| 4513380 | Method of tool recovery in threadcutting apparatus A method for operating a computer controlled industrial machine, such as a lathe, in which a machining operation can be interrupted, a tool displaced from a workpiece and the operation subsequently resumed at the point of interruption. The method includes... | 04/23/1985 |
| 4500818 | Dual motor proportioning control The invention disclosed is a control system for controlling a pair of separately excited motors arranged such that each motor of the pair drives a separate wheel on a common axle of an electrically powered vehicle. The control system continuously and indi... | 02/19/1985 |
| 4493032 | Method and apparatus for positioning using circular interpolation A method and apparatus are disclosed for providing very precise incremental motion of a numerically controlled machine tool, or other similarly controlled object, along a circularly arced path. For a mutually perpendicular X and Y coordinate system, X and... | 01/08/1985 |
| 4489377 | Method for preventing machine component interference A method for preventing interference between relatively moveable components of a computer controlled industrial machine in which the position of the moveable machine elements are controlled by a computer program. For each movement, the computer first dete... | 12/18/1984 |
| 4479080 | Electrical braking control for DC motors An electrical braking control circuit for use in a control system for a direct current traction motor which may be employed, for example, to propel an electrically driven vehicle. The electrical braking controller of the invention initiates electrical bra... | 10/23/1984 |
| 4472669 | Compensated resolver feedback A method and apparatus by which the output value of a resolver position detection system is compensated for systematic phase shift errors produced by signal conditioning circuitry through which the signal passes.... | 09/18/1984 |
| 4468599 | Plug current regulator A plug current regulator for a dc electric traction motor propelled vehicle, implemented using a microcomputer for controlling a time-ratio switching regulator, provides a substantially smooth electrical braking function by applying relatively short time ... | 08/28/1984 |
| 4450427 | Contactor with flux sensor An electromagnetic contactor is provided with a flux sensing device, preferably a Hall effect sensor, mounted in its magnetic circuit. The magnetic circuit includes an air gap within which the flux sensing device is mounted. The air gap can be adjusted to... | 05/22/1984 |
| 4449080 | Electric vehicle protection scheme A fault detection and inhibit circuit for a power control unit in an electric traction motor propelled vehicle of the type wherein the power control unit includes a chopper circuit and a bypass contactor for shunting the chopper circuit when its percent c... | 05/15/1984 |
| 4449087 | Flux feedback firing control for a load commutated inverter A load commutated inverter synchronous motor drive system wherein a thyristor firing control of the inverter is determined by the amplitude of pesudo flux waveforms which are derived from the integral of the line voltages coupling the inverter to the moto... | 05/15/1984 |
| 4446414 | Terminal voltage limit regulator for a load commutated inverter A control system for a load commutated inverter AC synchronous motor drive provides an operational shift in the event of an increase in motor terminal voltage VTERM above a preselected reference level. Under such an increase in terminal voltage... | 05/01/1984 |
| 4427934 | Current limiter for a load commutated inverter A current limiter for a load commutated inverter-synchronous motor drive including a source side AC to DC converter (12) and a load side DC to AC converter (14) coupled via a DC link circuit including an inductor (16) wherein a torque reference signal (TO... | 01/24/1984 |
| 4426611 | Twelve pulse load commutated inverter drive system A control system for powering an AC load such as a polyphase synchronous motor having at least two sets of three phase (3$c;) windings. Each three phase winding set is powered by an independently operable six pulse load commutated inverter drive includ... | 01/17/1984 |
| 4420719 | Cross-tied current regulator for load commutated inverter drives A control system for an AC motor drive including a source side converter and a load side converter coupled together by means of a DC link circuit wherein the current in the DC link circuit is controlled by either the source side converter or load side con... | 12/13/1983 |
| 4404476 | Pulse shaping and amplifying circuit A pulse shaping and amplifying circuit receives direct current electrical power from a source and serves to supply a pulse of electrical energy to a load. First and second switches (e.g., transistor switches) are interconnected such that only one is condu... | 09/13/1983 |
