Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 5153757 | Network control arrangement A network arrangement and control method where, before any transmission of data occurs for a particular communication, a network controller determines an unused path to provide a connection, advantageously all the way through the network from a given inle... | 10/06/1992 |
| 5109408 | Arrangement for intentionally blocking telephone calls to predefined destination numbers but allowing such blocking to be selectively overridden A call processing embodiment where customers are offered, in addition to the conventional office dialing plan, a special dialing plan where received numbers are processed such that a query of a database is defined when a prespecified access code, e.g., *6... | 04/28/1992 |
| 5012466 | Call service initialization arrangement An initialization arrangement is disclosed that allows call services defined in service profiles stored in a switching system to be enabled for individual terminals in a multipoint configuration without requiring assignment of terminal endpoint identifier... | 04/30/1991 |
| 5007076 | Call announcement arrangement An improved call waiting feature implementation for use with conventional analog station sets. When a called station is busy, a call waiting signal is transmitted to the called station. If the called station flashes, a communication path betwaeen the prev... | 04/09/1991 |
| 4993016 | Network control arrangement for processing a plurality of connection requests A network control arrangement where two or more path hunt operations are performed in parallel using one or both of two techniques: (1) reading a memory for a second path hunt operation during the time that information read from the memory for a first pat... | 02/12/1991 |
| 4991168 | Concurrent multi-stage network control arrangement A network control arrangement where stage-specific busy/idle information is stored using individual memories for each stage, and path hunting is effected by combining the busy/idle information for all stages concurrently rather than sequentially. A single... | 02/05/1991 |
| 4988209 | Telephone agent management information system A computer connected to an ISDN switch via an ISDN digital subscriber line, provides management information regarding activities of a plurality of telephone agents. The computer has shared call appearances with a number of telephone agent stations and rec... | 01/29/1991 |
| 4989022 | Rearrangeable multiconnection switching networks constructed using combinatorial designs A switching network where a large class of combinatorial designs which are well known in the mathematical literature are for the first time applied to advantageously define the pattern of permanent connections effected between network input channels and i... | 01/29/1991 |
| 4988993 | Rearrangeable multiconnection switching networks constructed using combinatorial designs A switching network where a large class of combinatorial designs which are well known in the mathematical literature are for the first time applied to advantageously define the pattern of permanent connections effected between network input channels and i... | 01/29/1991 |
| 4887079 | Rearrangeable multiconnection switching networks constructed using combinatorial designs A switching network where a large class of combinatorial designs which are well known in the mathematical literature are for the first time applied to advantageously define the pattern of permanent connections effected between network input channels and i... | 12/12/1989 |
| 4500985 | Communication path continuity verification arrangement A number of communication units are connected to a time-multiplexed switch via communication links. Control messages are conveyed among the communication units and a central control whereby paths are established through the time-multiplexed switch from or... | 02/19/1985 |
| 4499532 | Floating battery feed circuit A floating battery feed circuit comprising a switching-mode, flyback power converter wherein a capacitor connected to a converter transformer winding develops a relatively low voltage used to energize the converter control circuitry. The converter control... | 02/12/1985 |
| 4485468 | Control word generation method and source facilities for multirate data time division switching A control word generation method and a structural arrangement of a control word source for use in a time division switching system for serving multirate data stations. The control word source includes a first memory that stores a first plurality of path-d... | 11/27/1984 |
| 4467149 | Compensation method and apparatus for use with nonideal test access lines An arrangement to compensate for the leakage and biasing characteristics associated with the semiconductor crosspoints of a concentrator to allow accurate telephone subscriber loop measurements to be made through the concentrator. A compensation current i... | 08/21/1984 |
| 4460806 | Dual tone multifrequency and dial pulse receiver A dual tone multifrequency and dial pulse receiver that receives 8000 digital data words per second, each of the data words including eight PCM bits representing the analog signal transmitted from a subscriber set and also including a line status bit indi... | 07/17/1984 |
| 4458968 | Integrated circuit chip carrier mounting arrangement An arrangement for the solderless mounting of a leadless integrated circuit chip carrier (13) on a printed wiring board (10). A contact interface element (20) presents an array of electrically conductive annular springs (27) which electrically connect the... | 07/10/1984 |
| 4429185 | Voltage detector circuit A voltage detector circuit for detecting a DC voltage on a line in the presence of a substantially fixed frequency AC voltage. The circuit may be used to detect call originations on a telephone line having longitudinal AC voltages induced thereon. The cir... | 01/31/1984 |
| 4429391 | Fault and error detection arrangement A fault and error detection arrangement for detecting transmission and routing errors made by systems in which a central data transmitter/receiver (601, 610) bidirectionally intercommunicates with peripheral circuits (620) through an interconnection arran... | 01/31/1984 |
| 4415220 | Compliant contact pin An electrical terminal pin (10) adapted for engagement with a plated-through hole in a printed wiring board backplane. The pin includes at least one end (12) for receiving electrically conductive elements and an S-shaped compliant portion (16) adapted and... | 11/15/1983 |
| 4401861 | Semiconductor crosspoint linearizing arrangement An arrangement for performing subscriber loop testing through a concentrator/expandor employing semiconductor crosspoints. The crosspoints of the concentrator/expandor are relatively nonlinear when conducting currents less than a predetermined current and... | 08/30/1983 |
| 4402039 | Telephone line circuit A floating, constant power, battery feed circuit wherein a single transformer is used to perform the functions of battery feed and audio coupling. AC feedback is used to control the dynamic output impedance of the circuit. To achieve a constant dynamic ou... | 08/30/1983 |
| 4400627 | Telephone switching network An arrangement and method for interconnecting the stages of a space division switching network which provides simple and continuous growth from a small number of lines to the system's maximum number of lines. The switching network comprises up to M input ... | 08/23/1983 |
| 4382294 | Telephone switching control arrangement A time division switching system which includes a central control, two time-multiplexed switching units each having a control distribution unit associated therewith and a plurality of interface modules each including a selected active control unit. Data w... | 05/03/1983 |
