Echelon Systems Corporation

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
 
 
H04J MULTIPLEX COMMUNICATION 3122
 
 
 
G06F ELECTRIC DIGITAL DATA PROCESSING 2445
 
 
 
H04K SECRET COMMUNICATION; JAMMING OF COMMUNICATION157
 
 
 
H04M TELEPHONIC COMMUNICATION 1162

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5513324 Method and apparatus using network variables in a multi-node networkMar 07, 94Apr 30, 96[G06F]
5319641 Multiaccess carrier sensing network communication protocol with priority messagesDec 03, 90Jun 07, 94[H04J]
5297143 Network communication protocol including a reliable multicasting techniqueDec 03, 90Mar 22, 94[H04J]
5206935 Apparatus and method for fast I/O data transfer in an intelligent cellMar 26, 91Apr 27, 93[G06F]
5197066 Collision detection circuit for communications networkMar 28, 91Mar 23, 93[H04J]
5148144 Data communication network providing power and message informationMar 28, 91Sep 15, 92[H04M]
5146471 Correlator for spread spectrum communications systemsApr 11, 91Sep 08, 92[H04K]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5257006 Method and apparatus for power line communicationsExpiredSep 21, 90Oct 26, 93[H04M]
5029180 Transceiver providing selectable frequencies and spreading sequencesExpiredAug 13, 90Jul 02, 91[H04K]
5018138 Protocol for network having a plurality of intelligent cellsExpiredNov 08, 88May 21, 91[H04J]
4979183 Transceiver employing direct sequence spread spectrum techniquesExpiredMar 23, 89Dec 18, 90[H04K]
4969146 Protocol for network having a plurality of intelligent cellsExpiredNov 08, 88Nov 06, 90[H04J]
4969147 Network and intelligent cell for providing sensing, bidirectional communications and controlExpiredNov 25, 88Nov 06, 90[H04J]
4955018 Protocol for network having plurality of intelligent cellsExpiredNov 08, 88Sep 04, 90[H04J]
4947484 Protocol for network having a plurality of intelligent cellsExpiredNov 08, 88Aug 07, 90[G06F]
4941143 Protocol for network having a plurality of intelligent cellsExpiredNov 08, 88Jul 10, 90[H04J]
4939728 Network and intelligent cell for providing sensing bidirectional communications and controlExpiredDec 19, 88Jul 03, 90[H04J]
4918690 Network and intelligent cell for providing sensing, bidirectional communications and controlExpiredNov 10, 87Apr 17, 90[H04J]

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