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 |
| 6356607 | Preamble code structure and detection method and apparatus In a first embodiment of the invention, a concatenated preamble code is formed by a kronecker product between two subcodes of the same or different lengths. The subcodes have favorable correlation properties and may be Barker codes, minimum peak sidelobe ... | 03/12/2002 |
| 6272121 | Spread spectrum communication system using DECT protocol A time division multiplexed wireless communication system using the DECT protocol with spread-spectrum modulation. The wireless communication system includes a spread-spectrum transmitter and receiver. The spread spectrum transmitter transmits using an M-... | 08/07/2001 |
| 6243372 | Methods and apparatus for synchronization in a wireless network As part of a preferred communication protocol, base stations which are synchronized to a PSTN of a wireless communication network, periodically transmits a preamble. A remote detects the preamble and, upon verification of the data contained in the base st... | 06/05/2001 |
| 6161013 | Wireless communication system and method A simple and flexible over-the-air communication system is provided in which user stations communicate with one or more base stations to place and receive telephone calls, in which the user stations are provided a secure voice or data link and have the ab... | 12/12/2000 |
| 6154486 | Preamble code structure and detection method and apparatus In a first embodiment of the invention, a concatenated preamble code is formed by a kronecker product between two subcodes of the same or different lengths. The subcodes have favorable correlation properties and may be Barker codes, minimum peak sidelobe ... | 11/28/2000 |
| 6141373 | Preamble code structure and detection method and apparatus In a first embodiment of the invention, a concatenated preamble code is formed by a kronecker product between two subcodes of the same or different lengths. The subcodes have favorable correlation properties and may be Barker codes, minimum peak sidelobe ... | 10/31/2000 |
| 6130886 | Coexisting communication systems An integrated communication system supporting multiple TDMA or TDD communication protocols whereby both protocols are supported within the same geographic region. Each protocol defines time frames and/or time slots of a different duration, from which is d... | 10/10/2000 |
| 6121935 | Folded mono-bow antennas and antenna systems for use in cellular and other wireless communications systems Improved antennas and antenna systems for use in cellular and other wireless communications systems. A folded mono-bow antenna element is provided which has a substantially omnidirectional radiation pattern in a horizontal plane and shows variation in gai... | 09/19/2000 |
| 6118824 | Spread-spectrum data publishing system A system for publishing data on shared broadcast channels using spread-spectrum techniques, which may comprise a spread-spectrum encoder capable of receiving data and placing it in a spread-spectrum signal format and a transmitter operating on a shared co... | 09/12/2000 |
| 6115412 | Spread spectrum wireless telephone system A system for accessing a telephone system, in which a set of user stations are matched with a set of base stations for connection to a telephone network. Each base station may be coupled directly or indirectly to the telephone network and may be capable o... | 09/05/2000 |
| 6094575 | Communication system and method A mobile communication system having a layered architecture communicates user and signaling data among components of the communication system in the form of information elements which are encapsulated within packets and which may be passed across one or m... | 07/25/2000 |
| 6094421 | Timing adjustment control for efficient time division duplex, frequency division duplex or hybrid time division duplex/frequency division duplex communication A system and method for time division duplex communication over a single frequency band wherein guard time overhead is reduced by active adjustment of reverse link transmission timing as a function of round trip propagation time. A time frame is divided i... | 07/25/2000 |
| 6088590 | Method and system for mobile controlled handoff and link maintenance in spread spectrum communication A simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a microcell or other type of cellular communication system. A method in which user stations communicate with one or more base stations to place ... | 07/11/2000 |
| 6041046 | Cyclic time hopping in time division multiple access communication system A technique for cyclic time hopping in a multiple access communication system, wherein each time frame of a TDMA system is divided into multiple time slots. A plurality of user stations, one for each time slot, communicate with a base station. Each user s... | 03/21/2000 |
| 6021333 | Method and system for transferring information within a mobile communication system A mobile communication system having a layered architecture communicates user and signaling data among components of the communication system in the form of information elements which are encapsulated within packets and which may be passed across one or m... | 02/01/2000 |
| 6005856 | Communication protocol for spread spectrum wireless communication system A communication protocol for use in a mobile cellular communication system using time division duplex establishes a communication channel between a user station (e.g., a handset) and a base station in a time slot by assigning a first time segment within t... | 12/21/1999 |
| 5991625 | Spread spectrum wireless telephone system A wireless communication system employing spread-spectrum communication techniques. A plurality of base stations may be coupled directly or indirectly to a telephone network and may initiate or receive calls on the telephone network. A plurality of user s... | 11/23/1999 |
| 5963586 | Method and apparatus for parallel noncoherent correlation of a spread spectrum signal A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A transmitter divides a signal data stream into a plurality of data streams (such as I and Q data streams), independently modulates the ... | 10/05/1999 |
| 5959980 | Timing adjustment control for efficient time division duplex communication A system and method for time division duplex communication over a single frequency band wherein guard time overhead is reduced by active adjustment of reverse link transmission timing as a function of round trip propagation time. A time frame is divided i... | 09/28/1999 |
| 5953370 | Apparatus for receiving and correlating a spread spectrum signal A spread spectrum receiver for demodulating a CPM spread spectrum signal receives burst comprising a preamble and a data message that have been transmitted by M-ary encoding of a data signal into a single chip stream, dividing the chip stream into I and Q... | 09/14/1999 |
| 5887020 | Multi-band, multi-mode spread-spectrum communication system A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and microcellular mode. Selectable frequency bands include bo... | 03/23/1999 |
| 5884148 | Wireless local loop system and method A system and method for setting up a telephone call over a communication path having at least one wireless communication link comprises a universal radio converter (URC) connected to a standard non-wireless device by way of a standard analog interface ove... | 03/16/1999 |
| 5881100 | Method and apparatus for coherent correlation of a spread spectrum signal A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A transmitter divides a signal data stream into a plurality of data streams (such as I and Q data streams), independently modulates the ... | 03/09/1999 |
| 5859842 | Antenna diversity techniques A receiver system for antenna diversity employing a single backhaul cable. A single backhaul cable couples a receiver to a plurality of antennas. The signals from the antennas are combined onto the single backhaul cable using frequency offsets, spread spe... | 01/12/1999 |
| 5856998 | Method and apparatus for correlating a continuous phase modulated spread spectrum signal A technique for modulating and demodulating continuous phase modulation (CPM) spread spectrum signals and variations thereof. A transmitter encodes M data bits using a selected spread spectrum code, divides the spread spectrum code into a plurality of chi... | 01/05/1999 |
| 5850600 | Three cell wireless communication system A wireless communication system including a repeated pattern of cells, in which base station transmitters and user station transmitters for each cell may be assigned a spread-spectrum code for modulating radio signal communication in that cell. Radio sign... | 12/15/1998 |
| 5832022 | Method and apparatus for controlling the modulation index of continuous phase modulated (CPM) signals A transceiver uses feedback control to monitor a transmitted continuous phase modulation (CPM) waveform, such as a spread spectrum CPM waveform, and adjust the modulation index in response thereto. Codewords are selected from a table according to a data s... | 11/03/1998 |
| 5832028 | Method and apparatus for coherent serial correlation of a spread spectrum signal A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A transmitter divides a signal data stream into a plurality of data streams (such as I and Q data streams), independently modulates the ... | 11/03/1998 |
| 5818820 | Method and system for data link expansion or contraction using spread spectrum TDMA communication A simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a micro cell or other type of cellular communication system. A method in which user stations communicate with one or more base stations to place... | 10/06/1998 |
| 5815525 | Multi-band, multi-mode spread-spectrum communication system A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and microcellular mode. Selectable frequency bands include bo... | 09/29/1998 |
| 5802046 | Efficient time division duplex communication system with interleaved format and timing adjustment control A system for efficient time division duplex communication between a base station and a plurality of user stations over a single frequency band whereby guard time overhead is reduced through use of an interleaved frame structure and active adjustment of re... | 09/01/1998 |
| 5796772 | Multi-band, multi-mode spread-spectrum communication system A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and microcellular mode. Selectable frequency bands include bo... | 08/18/1998 |
| 5790587 | Multi-band, multi-mode spread-spectrum communication system A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and microcellular mode. Selectable frequency bands include bo... | 08/04/1998 |
| 5790591 | Spread spectrum transmitter and communications system using multiple spreading codes A spread spectrum transmitter for generating a plurality of spread spectrum codes comprises a shift register having a plurality of stages, with a plurality of tap sets connected to selected ones of said stages. Each tap set defines a different spread spec... | 08/04/1998 |
| 5787076 | Multi-mode TDMA spread spectrum communication system A simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a microcell or other type of cellular communication system. A method in which user stations communicate with one or more base stations to place ... | 07/28/1998 |
| 5784403 | Spread spectrum correlation using saw device A technique is provided using a SAW device for correlating to a plurality of different chip code sequences, such as M different chip code sequences, using fewer than M individual SAW correlators. A received signal is provided to a SAW correlator capable o... | 07/21/1998 |
| 5781593 | Methods and apparatus for vocoder synchronization in mobile communication network In a communication network, a synchronized over-the-air (OTA) time slot of a base station's polling loop is acquired by a remote station seeking to initiate contact with that base station, such that periodic voice frames may thereafter be transmitted at k... | 07/14/1998 |
| 5771025 | Folded mono-bow antennas and antenna systems for use in cellular and other wireless communication systems Improved antennas and antenna systems for use in cellular and other wireless communications systems. A folded mono-bow antenna element is provided which has a substantially omnidirectional radiation pattern in a horizontal plane and shows variation in gai... | 06/23/1998 |
| 5771024 | Folded mono-bow antennas and antenna systems for use in cellular and other wireless communications systems Improved antennas and antenna systems for use in cellular and other wireless communications systems. A folded mono-bow antenna element is provided which has a substantially omnidirectional radiation pattern in a horizontal plane and shows variation in gai... | 06/23/1998 |
| 5768264 | Time division multiple access base station supporting ISDN messages A simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a microcell or other type of cellular communication system. A method in which user stations communicate with one or more base stations to place ... | 06/16/1998 |
