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:
Sep. 27, 1977
Filed:
Feb. 11, 1976
John F Underwood, Orlando, FL (US);
Other;
Abstract
An electromagnetic pickup is provided for musical instruments, particularly of the type having vibrating magnetizable strings, which pickup device includes a permanent magnet having a configured surface adjacent to the magnetizable strings to provide a varying magnetic field effecting respective ones of the strings in accordance with their magnetizability, and a low impedance coil surrounding the permanent magnet. The permanent magnet is a rectangular bar magnet being magnetized perpendicularly to the configured surface, with the configured surface providing a cross-sectional variation of a dimension of the bar magnet, thereby varying the magnetic field effecting the different strings. Particular cross-sectional variations of this dimension are included, each of which achieves the natural tone of the respective strings and enhances the balance therebetween of the pickup output.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile