The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 1986
Filed:
May. 09, 1983
Derek R Allen, Newport Beach, CA (US);
Other;
Abstract
A stethoscope is provided which includes a stethoscope head and a pair of ear tips which are connected by tube means which provide individually separate air passages from the stethoscope head to the ear tips. The length of each of the air passages is selected such that the resonant peaks of sound transmitted from the stethoscope head to one ear lie in the resonant valleys of sound transmitted from the stethoscope head to the other ear. This is achieved by utilizing separate air passages which have a length ratio in the range of about 0.63 to about 0.73. The stethoscope is preferably utilized in conjunction with a dual stethoscope head having a bell receiver for transmitting low frequency sounds and a diaphragm receiver for transmitting high frequency sounds.