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 |
| 4959852 | Telephone answering machine having solid state and magnetic tape storage for outgoing announcements A telephone answering machine having solid state storage of an outgoing announcement (OGA) is improved by magnetic tape apparatus 120 for providing backup protection of the OGA in the event of a power failure. Also stored on the magnetic tape is the time ... | 09/25/1990 |
| 4924492 | Method and apparatus for wideband transmission of digital signals between, for example, a telephone central office and customer premises In a telephone local loop transmission arrangement, data is communicated from the customer premises to the central office utilizing a multi-dimensional, passband signal illustratively at 480 kb/s and 1.544 Mb/s.... | 05/08/1990 |
| 4902237 | Adaptor for surface mount and through-hole components An adaptor for interfacing a surface mount or through-hole electrical component to a printed circuit board. In one orientation of the adaptor relative to the printed circuit board, the adaptor receives a through-hole component and interfaces this componen... | 02/20/1990 |
| 4901231 | Extended process for a multiprocessor system In a multiprocessor system, a program's execution that is controlled by controlling an extended process that spans a plurality of processors. The extended process comprises an user process on one processor for executing object code of the program and stub... | 02/13/1990 |
| 4901346 | Computer controlled speakerphone for adapting to a communication line A computer controlled speakerphone includes a line adapting arrangement for developing information about an interface between the speakerphone and a hybrid in a communication line and for providing optimal performance during operation by adapting operatin... | 02/13/1990 |
| 4901348 | Data transmission security arrangement for a plurality of data stations sharing access to a communication network An arrangement for securing data transmissions to and from one data device from among a plurality of data devices sharing a common interface is disclosed. In a data communication network, a master communication bus connects to a plurality of data transmit... | 02/13/1990 |
| 4898444 | Non-invasive optical coupler A non-invasive optical fiber coupler for coupling light into an optical fiber bus through the cladding surrounding the optical fiber bus without bending the optical fiber bus. The coupler comprises a tap optical fiber free end adjacent to and facing a reg... | 02/06/1990 |
| 4899377 | Communication terminal telephone directory with dynamic directory tabbing The names in a directory stored in a personal terminal having a display are displayed as groups of names in which illustratively the first name in each group of names serves as a displayed tab which is pointed to by the user to display the respective grou... | 02/06/1990 |
| 4897798 | Adaptive environment control system This adaptive environment control system provides an HVAC control system that adapts to the continually-changing thermal characteristics of the building in which it operates. The adaptive environment control system periodically estimates the thermal chara... | 01/30/1990 |
| 4896350 | Arrangement for providing a call-connection service In a private communication network (10) served by a provider of call interconnection services, e.g., a carrier service node (15), the number of trunks (50-52) used within a call path is reduced without affecting the private nature of the private network. ... | 01/23/1990 |
| 4894749 | Option slot filler board Option-equippable apparatus such as a computer that is not fully equipped with option circuit boards (14) has filler boards (15,16) connected to free board slots (13). In one embodiment, the filler boards (15) simulate the effect of circuit boards on airf... | 01/16/1990 |
| 4887288 | Self calibration arrangement for a voice switched speakerphone An electrical calibration circuit in a voice switched adaptive speakerphone accurately determines the operating parameters of the speakerphone for optimal performance before operation. This is achieved by updating thresholds used to determine when the spe... | 12/12/1989 |
| 4885749 | Data transmission with improved message format In a voiceband data multipoint network, each tributary modem transmits, in a trailer which follows the user data, a tributary modem identification, a sequence number which advances for each start-up and a checksum. The observation at the receiver of a gap... | 12/05/1989 |
| 4885435 | Cantilever spring switch having multiple fulcrums A manually operated switch that combines spring and contact functions in a low profile, machine-insertable component. The switch readily mounts onto a printed wiring board. It includes a cantilevered leaf spring member having one free end and a pair of sp... | 12/05/1989 |
| 4885219 | Rotatable storage compartment for batteries and the like An improved storage compartment for batteries and the like is formed by a housing and a compartment door. The housing includes an opening along one edge that is shaped to receive the compartment door. Within the opening are circular supports for holding t... | 12/05/1989 |
| 4885741 | Data communication arrangement with embedded matrix switch Modems, data service units, application modules and other data communication devices, installed in a common equipment cabinet, are interconnected by way of a time division multiplexed bus. Time slots assigned to the various devices recur at a number of ri... | 12/05/1989 |
| 4882474 | Security file system and method for securing data in a portable data carrier A security file system for a portable data carrier provides improved security for the data carrier and for data contained in files in the data carrier. Although the data carrier may be embodied to look and feel much like an ordinary credit card, it contai... | 11/21/1989 |
| 4881059 | Manchester code receiver An improved Manchester code receiver is disclosed which samples the received signal and subtracts from that sample a previous sample of the received signal delayed by a half-bit time interval. A timing extractor selects sample timing from the central zero... | 11/14/1989 |
| 4879743 | PBX and adjunct using multi-frequency tones for communication therebetween A PBX system is responsive to an incoming call which is directed to an adjunct of the system for sending a ringing signal over a station facility to the adjunct. When the adjunct goes off-hook, the system outputs to the adjunct over the station facility m... | 11/07/1989 |
| 4879507 | Noise measurement probe A probe for providing noise measurements of an electrical circuit includes at least one loop of wire connected to a plurality of conductors. The loop interconnects one or more signal-carrying ones of the conductors to one or more of the conductors carryin... | 11/07/1989 |
| 4876717 | Adjunct processor for providing computer facility access protection via call transfer This adjunct processor arrangement performs a centralized call screening function to provide computer port access security. Every call origination in the telephone switching system from a calling party to a protected computer port is interdicted by the te... | 10/24/1989 |
| 4872205 | Radio communication system having autonomously selected transmission frequencies When the disclosed frequency-hopping communication system is initially enabled, it detects another system operating within range by listening for a predefined radio frequency of a fixed duration. When that particular frequency is detected, the system know... | 10/03/1989 |
| 4628992 | Induced flow heat exchanger In order to cool heat generating components on an electronic assembly without contamination by particles carried in a cooling gas stream, a cold plate is disposed adjacent the assembly, defining a gap region therebetween. The cooling gas is directed in pr... | 12/16/1986 |
