The Hart Group

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Patent Activity in the Last 10 Years

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4618986 Electronic stethoscopeExpiredNov 04, 83Oct 21, 86[A61B]
4534058 Electronic stethoscope with automatic power shut-offExpiredMar 29, 83Aug 06, 85[H04R]
4528690 Compact hybrid stethoscopeExpiredMar 12, 84Jul 09, 85[H04R, A61B]

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