US4807509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent fret grid for stringed instruments
Assignee: Individual
•
Filing: 1987-07-02
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Granted: 1989-02-28
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Expires: 2007-07-02
Abstract
Abstract A musical training device for stringed instruments having a neck with a fret board includes a fret support plate that extends over the instrument neck and includes regularly spaced transverse raised frets defining therebetween spaces receptive of the musician's fingers. A matrix of thin lights displayed upon the fret board are contained within the fret board and include electroluminescent flat light displays viewable from a wide angle and under ambient lighting conditions and capable of indicating the actual musical note of each position at each position, each comprising at least in part a phosphor layer and an electrode for applying an electric field across the phosphor layer.
Inventors
- 👤 John F. Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:43
CPC Classifications
G; G10; G10D; G10D1/00; G10D1/04; G10D1/05; G10D3/00; G10D3/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
129 words
A musical training device for stringed instruments having a neck with a fret board and multiple strings comprising: a. a fret support plate extending substantially over the instrument neck and including regularly spaced transverse raised frets defining therebetween spaces receptive of a musician's fingers and selected strings to form preselected musical chords; b. a matrix of thin lights displayed upon the fretboard in multiple separate positions of strings and frets, each light comprising a generally rectangular area carrying a note indicia thereon; and c. the light matrix including electroluminescent flat panel displays carrying said note indicia thereon and viewable from a wide angle and under ambient lighting conditions, and comprising at least in part a phosphor layer and electrode means for applying an electric field across the phosphor layer.
Claim 2
Dependent Claim
129 words
A musical training device for stringed instruments having a neck with a fret board and multiple strings comprising: a. a fret support plate extending substantially over the instrument neck and including regularly spaced transverse raised frets defining therebetween spaces receptive of a musician's fingers and selected strings to form preselected musical chords; b. a matrix of thin lights displayed upon the fretboard in multiple separate positions of strings and frets, each light comprising a generally rectangular area carrying a note indicia thereon; and c. the light matrix including electroluminescent flat panel displays carrying said note indicia thereon and viewable from a wide angle and under ambient lighting conditions, and comprising at least in part a phosphor layer and electrode means for applying an electric field across the phosphor layer.
Claim 3
Dependent Claim
35 words
The apparatus of claim 1 wherein the electroluminescent flat panel display includes multiple layers of at least a phosphor layer, an insulator layer, and a pair of electrodes, positioned above and below the phosphor layer.
Claim 4
Dependent Claim
20 words
The apparatus of claim 1 wherein the light display has a flat uninterrupted outer surface receptive of the user's fingers.
Claim 5
Dependent Claim
22 words
The apparatus of claim 2 wherein the light matrix is viewable from a viewing angle of approximately one hundred sixty degrees (160°).
Claim 6
Dependent Claim
20 words
The apparatus of claim 2 wherein there are a pair of insulative layers positioned above and below the phosphor layer.
Claim 7
Dependent Claim
24 words
The apparatus of claim 1 wherein fretboard and light matrix are arranged in parallel planes, and positioned atop the neck of the stringed instrument.
Claim 8
Dependent Claim
61 words
The apparatus of claim 2 wherein the light matrix is a matrix of lights arranged in longitudinal rows corresponding to the number of instrument strings and in a number of transverse rows corresponding to the number of frets, and each light is generally rectangular and abuts and adjacent rectangular light and carries said note indicia that can display a musical note.
Claim 9
Dependent Claim
33 words
The apparatus of claim 7 further comprising selection means for lighting preselected lights so that certain desired chord positions can be designated on the instrument neck under selected strings and between selected frets.
Claim 10
Dependent Claim
28 words
The apparatus of claim 8 further comprising the means of indicating alphabetic characters to indicate the actual musical note of each position via the use of individual pixels.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |