US3939942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroacoustic transducers
Assignee: Individual
•
Filing: 1974-04-22
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Granted: 1976-02-24
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Expires: 1994-04-22
Abstract
Abstract The present invention comprises a radially pulsating cylindrical surface operating as a wave transmission-line. The device is responsive to electrical means and may be practically utilized to generate pressure waves. A conventional electromagnetic driving system is employed with the novel cylindrical surface. A cylindrical voice coil is affixed to the cylindrical surface co-axially. The surface may comprise a matrix of helically oriented fibers suspended in an elastomeric impregnant. Damping means may be provided both internally and terminally. The radiation produced is omnidirectional.
Inventors
- 👤 David E. Gore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:35
CPC Classifications
G; G10; G10K; G10K13/00; H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R9/00; H04R9/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
36 words
A wave transmission line comprising a cylindrical having a radially pulsating thin surface; and a mechanical driving force directed on a circumference of the cylinder in an axial direction to deform the surface of the cylinder.
Claim 2
Dependent Claim
36 words
A wave transmission line comprising a cylindrical having a radially pulsating thin surface; and a mechanical driving force directed on a circumference of the cylinder in an axial direction to deform the surface of the cylinder.
Claim 3
Dependent Claim
53 words
The invention of claim 1 further including a first end of said cylindrical surface propagating a wave which wave, in turn, causes a change in axial length and a corresponding change in radius of said cylindar; and a second end of said cylindrical surface comprising a plug of resistive material terminating said wave.
Claim 4
Dependent Claim
14 words
The invention of claim 2 where the resistive material of the plug is felt.
Claim 5
Dependent Claim
15 words
The invention of claim 2 where the resistive material of the plug is butyl rubber.
Claim 6
Dependent Claim
15 words
The invention of claim 2 where the resistive material of the plug is plastic foam.
Claim 7
Dependent Claim
26 words
The invention of claim 1 wherein the surface comprises an elastically controlled leverage system converting axial tension into radical decreases and axial compression into radial increases.
Claim 8
Dependent Claim
15 words
The invention of claim 1 wherein the surface comprises a double counter-roving helical fiber construction.
Claim 9
Dependent Claim
14 words
The invention of claim 7 wherein the cylindrical surface becomes essentially grain-oriented during operation.
Claim 10
Dependent Claim
13 words
The invention of claim 1 wherein the surface comprises a square weave textile.
Claim 11
Dependent Claim
19 words
The invention of claim 9 wherein the surface comprises a fiberglass cloth with an open-weave impregnated with an elastomer.
Claim 12
Dependent Claim
27 words
The invention of claim 10 wherein the bias plies of the cloth are oriented axially and circumferentially and wherein the surface comprises a high modulus low-density construction.
Claim 13
Dependent Claim
21 words
The invention of claim 11 wherein the surface has a propagation velocity of 3 times the speed of sound in air.
Claim 14
Dependent Claim
17 words
The invention of claim 1 wherein the surface comprises an oriented graphite fiber textile with cross-polymerized impregnants.
Claim 15
Dependent Claim
18 words
The invention of claim 13 wherein the stiffness to density ratio of the surface is greater than fiberglass.
Claim 16
Dependent Claim
21 words
The invention of claim 1 wherein the mechanical driving force is transmitted substantially evenly on a circumference in an axial direction.
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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |