4,534,258

43.75.Gh TRANSDUCING ASSEMBLY RESPONSIVE TO STRING MOVEMENT IN INTERSECTING PLANES

Norman J. Anderson, •nnders, NJ 13 August 1985 (Class 84/1.15); filed 3 October 1983

This electric guitar pickup system is of the type intended to respond to both horizontal and vertical components of the guitar string vibration. Magnets 42 and 42', similarly polarized, provide a magnetic field for string 12 in which + and - 45 ø vibration components generate output in coils 52

4,538,497

43.75.Gh SOFT BODY GUITAR

Walter E. Smith, Weiser, ID 3 September 1985 (Class 84/291); filed 2 December 1982

This guitar has its bridge 13 and nut mounted on a wooden stem 11 (which includes the neck), across which strings 15 are stretched. This string-supporting structure is mounted on a soft body 16 containing foam within a flexible sheath 17. Because the soft body adds mechanical damping

// /.• /.5'

to the string-supporting structure, this patent adds a high-density metal plate 19 on the under side of the stem in order to stiffen it and thereby prolong the duration time of the string vibration.mDWM

and 52', respectively. Other angular planes of vibration contribute to both coils. Alternate coils are combined into two separate channels for amplifica- tion and tone radiation, so that a spatial effect is heard by the listeners.m DWM

4,539,228

43.75.Gh METHOD OF EXTENDING USEFUL LIFE OF INSTRUMENT STRINGS

Arnold Lazarus, San Francisco, CA 3 September 1985 (Class 427/180); filed 29 October 1984

According. to the patent, guitar strings have a "break-in" period after which is a "prime sound," followed by a corrosion process which leads to a "dead period." Although this sequence is believed to characterize strings wrapped helically with a strand of wire, more than single strand unwrapped strings, the latter are also believed to develop microscopic pores and crev- ices which contribute to string quality degradation. The cure proposed by the patent is to fill the interstices of a wound string, or the pores and crevices of an unwound string, with dry lubricant particles by soaking the strings for an extended period of time in a moisture displacing lubricant and corrosion inhibitor containing micronized tetrafiuoroethylene or polytetrafiuoroeth- ylene.•DWM

4,538,498

43.75.Gh IMPROVEMENTS IN AND RELATING TO AN ACOUSTIC GUITAR BRIDGE

Timothy J. Marten, London, England 3 September 1985 (Class 84/298); filed in United Kingdom 28 October

1982)

This acoustic guitar bridge consists of a shell I attached to the guitar body, which contains an adjustable saddle 12 (passing through shell slot 3) on which the stretched strings rest. Wedge-shaped support member 4 be-

neath the saddle can be moved by screw adjustment to raise or lower the support member to the desired position.•DWM

4,543,871

43.75.Kk PERCUSSION BAR INSTRUMENT

Garry M. Kvistad, West Hurley, NY I October 1985 (Class 84/403); filed 18 August 1983

This patent describes a mounting system for a musical instrument con- sisting of percussion bars of different lengths, in which each bar 19 rests

4,539,887

43.75.Gh STRING INSTRUMENT OF GUITAR TYPE

Johan B. Bjerk/•s, Svanesund, Sweden 10 September 1985 (Class 84/314 R); filed in Sweden 17 May 1982 ,

This guitar is designed for unconventional tuning of a type intended to make the playing of both individual notes and chords simpler for the begin- ning guitarist, especially in the playing of traditional occidental harmony. In this system the musical interval between adjacent open strings alternates between three and four semitones. In some versions the number of strings is greater than usual.•DWM

13

i • II II 17

upon two cradles 21 which are slidably adjustable within grooves 31 in mounting strips 13, so that the mounting points will be at nodal points of the bars.--DWM

886 J. Acoust. Soc. Am. 79(3), March 1986; 0001-4966/86/030886-01500.80; ¸ 1986 Acoust. Soc. Am.; Patent Reviews 886

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