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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 7418105 | Sheath for in-ear device A sheath may be folded inside-out to cover a core-form and form an in-ear device therewith. A settable compound is injected between the spacing formed between core-from and sheath to allow in-situ fitting. The sheath is of variable thickness, having lower thickness ... | 08/26/2008 |
| 6768803 | Method and apparatus for selective acoustic signal filtering The present invention relates to a method and apparatus for performing selective acoustic signal filtering. The apparatus comprises two acoustic ports, an electrical output port and an acoustic signal processing device, where all three ports have an impedance charac... | 07/27/2004 |
