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Patent US3958484A successfully refreshed from Google Patents.
US3958484A
Expired / Lapsed
US
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Sealing means for wind instruments
Assignee: ROBERTS PRODUCTS Inc
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Filing: 1975-05-29
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Granted: 1976-05-25
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Expires: 1995-05-29
Abstract
Abstract Improvement in sealing means for wind instruments wherein pads are mounted on the cups of keys which are actuated to open one or more tone holes on such instruments which holes are normally closed by the pads. The improvement resides in the pads being comprised of a first layer of a relatively soft, closed-cell, cross-linked polyethylene foam material which is adapted to enter the tone hole of such instruments and seal it off from the atmosphere thus preventing air leaks through such holes and a second layer, bonded to the first layer, of a greater rigidity than the first layer, of a closed-cell polyethylene foam material which is adapted to be secured to the key cup thus forming a pad having a long life and one which is unaffected by moisture.
Inventors
- 👤 Robert E. Nelson
- 👤 Robert D. Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:51
CPC Classifications
G; G10; G10D; G10D9/00; G10D9/04; G10D9/047
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
96 words
In sealing means for a wind instrument having a plurality of spaced holes normaly closed by key cups having pads thereon sealing off the holes with respect to the atmosphere, the improvement which comprises: said pads being comprised of a first layer of a relatively soft, closed-cell, cross-linked polyethylene foam material bonded to a second layer of a closed-cell polyethylene foam material of a rigidity greater than said first layer, a portion of said first layer entering one of said holes when said one of said holes is normally closed by one of said key cups.
Claim 2
Dependent Claim
96 words
In sealing means for a wind instrument having a plurality of spaced holes normaly closed by key cups having pads thereon sealing off the holes with respect to the atmosphere, the improvement which comprises: said pads being comprised of a first layer of a relatively soft, closed-cell, cross-linked polyethylene foam material bonded to a second layer of a closed-cell polyethylene foam material of a rigidity greater than said first layer, a portion of said first layer entering one of said holes when said one of said holes is normally closed by one of said key cups.
Claim 3
Dependent Claim
38 words
In the sealing means of claim 1 wherein the density of said first layer is about four pounds per cubic feet and the density of said second layer is between about 30 to 40 pounds per cubic feet.
Claim 4
Dependent Claim
27 words
In the sealing means of claim 2 wherein said first layer is about 40 mils in thickness and said second layer is about 80 mils in thickness.
Claim 5
Dependent Claim
17 words
In the sealing means of claim 3 wherein said first layer is laminated to said second layer.
Claim 6
Dependent Claim
21 words
In the sealing means of claim 4 wherein said first layer is Volara material and said second layer is Volite material.
Claim 7
Dependent Claim
16 words
In the sealing means of claim 5 wherein said first layer is Type A Volara material.
Claim 8
Dependent Claim
32 words
In the sealing means of claim 6 wherein a third layer of material having indicia thereon is adhered to said second layer, said third layer being fixedly secured to said key cup.
Claim 9
Dependent Claim
21 words
In the sealing means of claim 6 wherein said first layer is slightly greater in overall diameter than said tone hole.
Claim 10
Dependent Claim
47 words
A pad for sealing off the tone hole of a wind instrument or the like comprising: a first layer of a relatively soft, closed-cell, cross-linked polyethylene foam material bonded to a second layer of a closed-cell polyethylene foam material of a rigidity greater than said first layer.
Claim 11
Dependent Claim
47 words
A pad for sealing off the tone hole of a wind instrument or the like comprising: a first layer of a relatively soft, closed-cell, cross-linked polyethylene foam material bonded to a second layer of a closed-cell polyethylene foam material of a rigidity greater than said first layer.
Claim 12
Dependent Claim
42 words
The pad of claim 9 wherein the material comprising said first layer has a density of about 4 pounds per cubic foot and the material comprising said second layer has a density of between about 30 and 40 pounds per cubic foot.
Claim 13
Dependent Claim
25 words
The pad of claim 10 wherein said first layer is about 40 mils in thickness and said second layer is about 80 mils in thickness.
Claim 14
Dependent Claim
15 words
The pad of claim 11 wherein said first layer is laminated to said second layer.
Claim 15
Dependent Claim
19 words
The pad of claim 12 wherein said first layer is Volara material and the second layer is Volite material.
Claim 16
Dependent Claim
14 words
The pad of claim 13 wherein said first layer is Type A Volara material.
Claim 17
Dependent Claim
20 words
The pad of claim 14 wherein a third layer of material having indicia thereon is adhered to said second layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |