Individual holder
ALLEN DEREK R
7 granted patents·132 citations·filing 1978–1995
Individually held — no corporate assignee on record.
Top patents by PatentIndex Score
7 records- 0187USD256951SDual stethoscope microphoneALLEN DEREK R·Filed 1978·Granted Sep 16, 1980·22 cites·1 claims
- 0263USD323033SDisposable stethoscopeALLEN DEREK R·Filed 1988·Granted Jan 7, 1992·10 cites·1 claims
- 0351US4212368AAngularly related dual stethoscope headALLEN DEREK R·Filed 1978·Granted Jul 15, 1980·24 cites·6 claims
- 0450US4569413AEnhanced audiotransmission stethoscopeALLEN DEREK R·Filed 1983·Granted Feb 11, 1986·31 cites·17 claims
- 0547US5498841ADual acoustical passage stethoscopeALLEN DEREK R·Filed 1995·Granted Mar 12, 1996·22 cites·19 claims
- 0634US4991686ADisposable stethoscopeALLEN DEREK R·Filed 1988·Granted Feb 12, 1991·14 cites·14 claims
- 0731US4928786ASelf-sealing dual stethoscope headALLEN DEREK R·Filed 1989·Granted May 29, 1990·9 cites·17 claims
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