Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1978-10-16
1980-04-29
Tomsky, Stephen J.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
181135, A61B 702
Patent
active
042001692
ABSTRACT:
This invention relates to a stethoscope having improved acoustical properties. The improvement comprises twin, smooth-walled sound pathways extending from the chestpiece to the ear tips which are free of sound leakage and each pathway has a constant diameter along its entire length.
REFERENCES:
patent: 1847607 (1932-03-01), Hardt
patent: 3108652 (1963-10-01), Littmann
patent: 3168161 (1965-02-01), Littmann
patent: 3437172 (1969-04-01), Allen
patent: 3504760 (1970-04-01), Littmann
patent: 3570625 (1971-03-01), Allen
MacDonald, III Robert D.
Nelson Frederick W.
Alexander Cruzan
Bates Carolyn A.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Tomsky Stephen J.
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