XEL COMMUNICATIONS, INC.
Patent Owner
Stats
- 1 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- Feb 25, 1997 most recent publication
Details
- 1 Issued Patents
- 0 Issued in last 3 years
- 0 Published in last 3 years
- 454 Total Citation Count
- Feb 29, 1988 Earliest Filing
- 12 Expired/Abandoned/Withdrawn Patents
Patent Activity in the Last 10 Years
Technologies
Intl Class
Technology
Matters
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Top Patents (by citation)
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Recent Publications
- No Recent Publications to Display
Recent Patents
Patent #
Title
Filing Date
Issue Date
Intl Class
5301187 System for implementing broadband audio program telephony circuits using 2B1Q technologyMay 25, 93Apr 05, 94[H04B, H04J]
Expired/Abandoned/Withdrawn Patents
Patent #
Title
Status
Filing Date
Issue/Pub Date
Intl Class
5606725 Broadband network having an upstream power transmission level that is dynamically adjusted as a function of the bit error rateExpiredNov 29, 94Feb 25, 97[H04N]
5513173 Data link access unit for T1 spans supporting the extended superframe format (ESF)ExpiredMar 16, 94Apr 30, 96[H04L, H04J]
5488413 CATV telephony system using subsplit band for both directions of transmissionExpiredJun 14, 94Jan 30, 96[H04N]
5408524 Answer supervision over pulse code modulated carrier system and method thereforeExpiredMar 29, 93Apr 18, 95[H04M, H04J]
5197068 Intra channel bank communication protocols between channels and the line interface unit of a telephone systemExpiredAug 23, 90Mar 23, 93[H04J]
5151935 Programmable universal signaling circuit for a telephone networkExpiredNov 02, 90Sep 29, 92[H04M, H04J]
5140625 System for testing 2B1Q telephony loopback circuits and method thereforExpiredMar 04, 91Aug 18, 92[H04M, G06F]
5081670 Smart data station termination (DST) without active equalizersExpiredApr 02, 91Jan 14, 92[H04M]
5034978 Universal channel unit switchable between two wire and four wire configurationsExpiredDec 15, 89Jul 23, 91[H04M]
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