Patent US4308784A successfully refreshed from Google Patents.
US4308784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic parts for stringed musical instruments
Assignee: Individual
•
Filing: 1980-05-27
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Granted: 1982-01-05
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Expires: 2000-05-27
Abstract
Abstract An improved fret, nut and/or, bridge saddle for stringed instruments comprises a polished aluminum oxide ceramic. The ceramic of this invention is long lasting and provides improved tonal clarity, and can increase greatly the ease with which a strummed instrument can be played.
Inventors
- 👤 Thomas S. Eizonas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:22
CPC Classifications
G; G10; G10D; G10D3/00; G10D3/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
A stringed musical instrument element, which comes in contact with the strings of said stringed musical instrument, said element being an aluminium oxide ceramic containing from about 75% to about 100% aluminum oxide, having a particle size of from about 5 to about 30 microns, and a Rockwell A hardness of at least about 60 to about 87.
Claim 2
Dependent Claim
58 words
A stringed musical instrument element, which comes in contact with the strings of said stringed musical instrument, said element being an aluminium oxide ceramic containing from about 75% to about 100% aluminum oxide, having a particle size of from about 5 to about 30 microns, and a Rockwell A hardness of at least about 60 to about 87.
Claim 3
Dependent Claim
20 words
The element of claim 1 in which the aluminum oxide ceramic contains from about 90% to about 100% aluminum oxide.
Claim 4
Dependent Claim
9 words
The element of claim 2 which is a fret.
Claim 5
Dependent Claim
9 words
The element of claim 1 which is a fret.
Claim 6
Dependent Claim
20 words
An element according to claim 4 in which the thickness of the fret is substantially uniform from top to bottom.
Claim 7
Dependent Claim
19 words
The element according to claim 5 in which the ceramic has an alumina content of from 90% to 100%.
Claim 8
Dependent Claim
20 words
The element of claim 6 which the ceramic has an aluminum oxide content of from about 90% to about 100%.
Claim 9
Dependent Claim
27 words
The element according to claim 4 in which the fret has a narrow base and vertical wall and a pair of outwardly extending flanges at the top.
Claim 10
Dependent Claim
11 words
An element according to claim 1 which is a bridge saddle.
Claim 11
Dependent Claim
10 words
An element according to claim 1 which is a nut.
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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) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |