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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4454502 Apparatus for monitoring and signalling systemExpiredNov 14, 79Jun 12, 84[H04M, G08B]
D262964 Housing for an automatic telephone alarm systemExpiredMar 30, 79Feb 09, 82[D140]
4303801 Apparatus for monitoring and signalling systemExpiredNov 14, 79Dec 01, 81[H04M]
4286331 Monitoring and signalling system including apparatus for processing and analyzing signals produced by activity monitoring sensorsExpiredNov 14, 79Aug 25, 81[G06F]
4284849 Monitoring and signalling systemExpiredNov 14, 79Aug 18, 81[H04M]
4273960 Apparatus for monitoring usage of a telephoneExpiredNov 14, 79Jun 16, 81[H04M]
D258577 Signalling deviceExpiredDec 04, 78Mar 17, 81[D100]
4255669 Sensing apparatusExpiredSep 17, 79Mar 10, 81[G08B]
4224602 Signalling deviceExpiredDec 04, 78Sep 23, 80[G08B, H04B, H01H]

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