Construction material for stringed musical instruments
US4364990A · kind A · utility
31Cited by
8References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1975 |
| Grant date | Dec 21, 1982 |
| Priority date | — |
| Expiry date | Mar 31, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/664
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Improved construction material especially suitable for use in the manufacture of soundboards and panels used in stringed instruments which equal or surpass the sound radiation qualities and physical properties of wood. The construction material of the invention includes fibers having a Young's modulus of elasticity greater than 18.times.10.sup.11 dynes/cm.sup.2 and a density less than 2 g/cc bonded to a material having a density lying within the range of 0.15 g/cc and 1 g/cc, the said fibers of the composite are oriented in such manner so as to provide a final material having a bending stiffness ratio of at least 4:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.