ADVANCED CELLULAR TELECOM CORP.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
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
RE31643 Hold circuit for telephone systemJan 06, 83Aug 07, 84[H04M]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5311175 Method and apparatus for pre-identification of keys and switchesExpiredNov 01, 90May 10, 94[H03M]
5274693 Abbreviated and enhanced dialing apparatus and methods particularly adapted for cellular or other types of telephone systemsExpiredJul 17, 90Dec 28, 93[H04M]
5168517 Apparatus and methods for selectively forwarding telephone callsExpiredMar 13, 89Dec 01, 92[H04M]
5157719 Automatic area code dialing apparatus and methods particularly adapted for cellular or other types of telephone systemsExpiredMar 12, 90Oct 20, 92[H04M]
5131031 Hold circuits for telephone systemsExpiredAug 24, 89Jul 14, 92[H04M]
4941166 Muting circuit for telephone answering machineExpiredJan 04, 88Jul 10, 90[H04M]
4768224 Single telephone line call forwarding deviceExpiredJun 01, 87Aug 30, 88[H04M]
4726048 Telephone privacy circuitExpiredApr 03, 84Feb 16, 88[H04M]
4670900 Single line telephone call forwarding deviceExpiredApr 17, 85Jun 02, 87[H04M]
4626630 Telephone call forwarding deviceExpiredDec 20, 84Dec 02, 86[H04M]
4251692 Telephone call restricting apparatusExpiredOct 06, 78Feb 17, 81[H04M]
4243844 Hold circuit for telephone systemExpiredSep 19, 78Jan 06, 81[H04M]

Top Inventors for This Owner

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