US4353862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making sound board
Assignee: Kaman Aerospace Corp
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Filing: 1980-05-12
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Granted: 1982-10-12
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Expires: 2000-05-12
Abstract
Abstract A fiber glass fabric reinforced wood sound board for a guitar is made by placing a sheet of wood in a shallow mold cavity with a layer of fiber glass fabric overlying an associated surface of the wood sheet, spreading a layer of liquid resinous compound over the layer of fabric to impregnate the fabric, providing a plate having a smooth surface, positioning the plate with its smooth surface in face-to-face engagement with the layer of liquid impregnating material to provide a substantial closure for the mold cavity, drawing vacuum on the mold cavity, and curing the liquid resinous material.
Inventors
- 👤 II Charles W. Kaman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:51
CPC Classifications
B; B32; B32B; B32B21/00; B32B21/10; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/088; B29C70/28; B29C70/30; B29C70/36; B29C70/68; B29C70/86; G; G10; G10D; G10D3/00; G10D3/22; B29L; B29L2031/00; B29L2031/758; B32B2367/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
185 words
A method for making a sound board assembly for a stringed musical instrument comprising the steps of positioning a layer of finely woven fiber glass fabric in adhering face-to-face relation with a sheet of wood with threads of the fabric extending in generally parallel relation to the grain of the wood, temporarily adhering said sheet of wood to a first mold plate with said fabric facing away from said plate, disposing a second mold plate so that a narrow space is left between said second mold plate and said layer of fabric to form a mold cavity between said first mold plate and said second mold plate, disposing said mold plates so that major surfaces of said plates are vertically oriented, introducing a transparent, curable liquid resin into the lower part of the space between said fabric and said second mold plate, evacuating air from between said mold plates at the upper part thereof while the curable liquid resin is being introduced fill said cavity, curing said resin to bond said fabric to said wood, and removing said sound board assembly from the mold plates.
Claim 2
Independent Claim
185 words
A method for making a sound board assembly for a stringed musical instrument comprising the steps of positioning a layer of finely woven fiber glass fabric in adhering face-to-face relation with a sheet of wood with threads of the fabric extending in generally parallel relation to the grain of the wood, temporarily adhering said sheet of wood to a first mold plate with said fabric facing away from said plate, disposing a second mold plate so that a narrow space is left between said second mold plate and said layer of fabric to form a mold cavity between said first mold plate and said second mold plate, disposing said mold plates so that major surfaces of said plates are vertically oriented, introducing a transparent, curable liquid resin into the lower part of the space between said fabric and said second mold plate, evacuating air from between said mold plates at the upper part thereof while the curable liquid resin is being introduced fill said cavity, curing said resin to bond said fabric to said wood, and removing said sound board assembly from the mold plates.
Claim 3
Dependent Claim
32 words
A method for making a sound board as set forth in claim 1 wherein the step of evacuating air is performed while introducing the curable liquid resin and while curing the resin.
Claim 4
Dependent Claim
47 words
A method for making a sound board assembly for a stringed musical instrument as set forth in claim 1 wherein the step of positioning the layer of fabric is further characterized as adhering portions of the layer of fabric to associated portions of the sheet of wood.
Claim 5
Dependent Claim
51 words
A method for making a sound board assembly for a stringed musical instrument as set forth in claim 1 or claim 3 including the additional step of shaping a sound board from the sheet of wood before positioning a layer of woven fabric in face-to-face engagement with the sheet of wood.
Claim 6
Dependent Claim
64 words
A method for making a sound board assembly for a stringed musical instrument as set forth in claim 4 and including the additional step of cutting the fabric to the configuration of the shaped sound board and wherein the step of positioning the fabric is further characterized as positioning the cut fabric in overlying relation with the shaped sound board and in registry therewith.
References Cited (Backward Citations)
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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) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |