SOUTHWESTERN BELL TELECOMMUNICATIONS, INC., A DE CORP.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
D294825 Combination handset and stand telephoneExpiredOct 10, 86Mar 22, 88[]
4706274 Cordless telephone systemExpiredMay 11, 84Nov 10, 87[H04Q]
D275482 Telephone cradleExpiredMay 01, 81Sep 11, 84[]
4467140 Microprocessor-based cordless telephone systemExpiredMay 01, 81Aug 21, 84[H04Q]
D274245 Telephone handsetExpiredMay 01, 81Jun 12, 84[]
D273492 Telephone handsetExpiredMay 01, 81Apr 17, 84[]
D272907 Telephone base stationExpiredMay 01, 81Mar 06, 84[D140]
D272533 Combined telephone handset and base station thereforExpiredMay 01, 81Feb 07, 84[D140]
D272438 Combined telephone handset and base station thereforExpiredMay 01, 81Jan 31, 84[D140]
4429025 Battery retaining deviceExpiredSep 30, 82Jan 31, 84[H01M]
D272147 Telephone base stationExpiredMay 01, 81Jan 10, 84[D140]
D272148 Telephone baseExpiredMay 01, 81Jan 10, 84[D140]
D272064 Combined telephone handset and base thereforeExpiredMay 01, 81Jan 03, 84[D140]
D258881 Wireless telephone receiverExpiredSep 22, 78Apr 14, 81[D140]
D256239 Wireless telephoneExpiredSep 22, 78Aug 05, 80[D140]
D256241 Wireless telephone base stationExpiredSep 22, 78Aug 05, 80[D140]

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