Patent US4364990A successfully refreshed from Google Patents.
US4364990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Construction material for stringed musical instruments
Assignee: University of South Carolina
•
Filing: 1975-03-31
•
Granted: 1982-12-21
•
Expires: 1995-03-31
Abstract
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 18×10 11 dynes/cm 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.
Inventors
- 👤 Daniel W. Haines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:29
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/28; B29; B29C; B29C70/00; B29C70/02; B29C70/021; B29C70/025; B29C70/04; B29C70/06; B29C70/08; B29C70/088; B29C70/10; B29C70/16; B29C70/20; B32B27/00; B32B27/12; G; G10; G10D; G10D3/00; G10D3/22; B29K; B29K2063/00; B29K2307/00; B29K2709/00; B29K2709/08; B29K2711/00; B29K2711/12; B29L; B29L2031/00; B29L2031/758; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/25; Y10T428/252; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996; Y10T428/2998; Y10T428/30; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31518; Y10T428/31551; Y10T428/31634; Y10T442/00; Y10T442/60; Y10T442/659; Y10T442/664
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
91 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of fibers embedded in a resin matrix in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of cardboard having a density within the range of 0.15 g/cc and 1 g/cc.
Claim 2
Dependent Claim
91 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of fibers embedded in a resin matrix in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of cardboard having a density within the range of 0.15 g/cc and 1 g/cc.
Claim 3
Dependent Claim
96 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of fibers embedded in a resin matrix in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of glass microspheres embedded in epoxy resin having a density within the range of 0.15 g/cc and 1 g/cc.
Claim 4
Dependent Claim
96 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of fibers embedded in a resin matrix in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of glass microspheres embedded in epoxy resin having a density within the range of 0.15 g/cc and 1 g/cc.
Claim 5
Dependent Claim
18 words
The construction material of claim 1 wherein the mat of fibers comprises graphite fibers embedded in epoxy resin.
Claim 6
Dependent Claim
18 words
The construction material of claim 2 wherein the mat of fibers comprises graphite fibers embedded in epoxy resin.
Claim 7
Dependent Claim
21 words
The construction material of claim 3 wherein the mat of cardboard is sandwiched between layers of said mat of graphite fibers.
Claim 8
Dependent Claim
26 words
The construction material of claim 4 wherein the mat of glass microspheres embedded in epoxy resin is sandwiched between layers of said mat of graphite fibers.
Claim 9
Dependent Claim
96 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of graphite fibers embedded in epoxy resin in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of cardboard having a density within the range of 0.15 g/cc and 1 g/cc, said fibers being oriented unidirectionally.
Claim 10
Dependent Claim
96 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of graphite fibers embedded in epoxy resin in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of cardboard having a density within the range of 0.15 g/cc and 1 g/cc, said fibers being oriented unidirectionally.
Claim 11
Dependent Claim
102 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of graphite fibers embedded in an epoxy resin in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of glass microspheres embedded in epoxy resin having a density within the range of 0.15 g/cc and 1 g/cc, said fibers being oriented unidirectionally.
Claim 12
Dependent Claim
102 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of graphite fibers embedded in an epoxy resin in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of glass microspheres embedded in epoxy resin having a density within the range of 0.15 g/cc and 1 g/cc, said fibers being oriented unidirectionally.
Claim 13
Dependent Claim
110 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of graphite fibers embedded in epoxy resin in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of cardboard having a density within the range of 0.15 g/cc and 1 g/cc, said fibers being oriented unidirectionally, said mat of cardboard being sandwiched between layers of said mat of graphite fibers.
Claim 14
Dependent Claim
110 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of graphite fibers embedded in epoxy resin in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of cardboard having a density within the range of 0.15 g/cc and 1 g/cc, said fibers being oriented unidirectionally, said mat of cardboard being sandwiched between layers of said mat of graphite fibers.
Claim 15
Dependent Claim
117 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of graphite fibers embedded in an epoxy resin in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of glass microspheres embedded in epoxy resin having a density within the range of 0.15 g/cc and 1 g/cc, said fibers being oriented unidirectionally, said mat of glass microspheres being sandwiched between layers of said mat of graphite fibers.
Claim 16
Dependent Claim
117 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of graphite fibers embedded in an epoxy resin in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of glass microspheres embedded in epoxy resin having a density within the range of 0.15 g/cc and 1 g/cc, said fibers being oriented unidirectionally, said mat of glass microspheres being sandwiched between layers of said mat of graphite fibers.
Claim 17
Dependent Claim
92 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of graphite fibers embedded in a resin matrix in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of cardboard having a density within the range of 0.15 g/cc and 1 g/cc.
Claim 18
Dependent Claim
92 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of graphite fibers embedded in a resin matrix in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of cardboard having a density within the range of 0.15 g/cc and 1 g/cc.
Claim 19
Dependent Claim
102 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of boron or graphite fibers embedded in a resin matrix in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of cardboard or glass microbaloons embedded in an epoxy resin having a density within the range of 0.15 g/cc and 1 g/cc.
Claim 20
Dependent Claim
102 words
A construction material especially suitable for use in the manufacture of soundboards and panels used in stringed musical instruments comprising a mat of boron or graphite fibers embedded in a resin matrix in which said fibers have a Young's modulus of elasticity greater than 18×10 11 dynes/cm 2 and a density less than 2 g/cc and are oriented in such manner as to effect a bending stiffness ratio of at least 4:1 in said construction material bonded to a mat of cardboard or glass microbaloons embedded in an epoxy resin having a density within the range of 0.15 g/cc and 1 g/cc.
References Cited (Backward Citations)
US3316139A
Cited
US3618442A
Cited
US3474697A
Cited
US3617416A
Cited
US3477330A
Cited
US3664911A
Cited
US3724312A
Cited
US3699836A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |