US3605043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersive delay line with tubular section
Assignee: Thales SA
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Filing: 1968-03-21
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Granted: 1971-09-14
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Expires: 1988-03-21
Abstract
Abstract A dispersive delay line with a tubular waveguide wherein are axially propagated waves of sonic or ultrasonic energy corresponding both to shear and compressional modes; suitable transducers are provided at the ends of the waveguide for exciting and collecting said waves.
Inventors
- 👤 Georges Bienvenu
- 👤 Pierre Tournois
- 👤 Jean Louis Vernet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:38
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/08; D01; D01H; D01H1/00; D01H1/11; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T442/00; Y10T442/30; Y10T442/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
101 words
A dispersive delay line for matched filtering of frequency modulated pulsed signals comprising: an elongated elastic tubular waveguide having a longitudinal axis and two end portions, first and second electromechanical transducers respectively coupled to said portions; said first transducer exciting within said tubular waveguide both shear and compressional vibrations having displacements coplanar with said axis and propagating towards said second transducer; the wall of said waveguide having between said end portions a thickness smaller than the ratio of the bulk shear velocity of the material of said waveguide to three times the upper frequency of the frequency range of said vibrations.
Claim 2
Dependent Claim
101 words
A dispersive delay line for matched filtering of frequency modulated pulsed signals comprising: an elongated elastic tubular waveguide having a longitudinal axis and two end portions, first and second electromechanical transducers respectively coupled to said portions; said first transducer exciting within said tubular waveguide both shear and compressional vibrations having displacements coplanar with said axis and propagating towards said second transducer; the wall of said waveguide having between said end portions a thickness smaller than the ratio of the bulk shear velocity of the material of said waveguide to three times the upper frequency of the frequency range of said vibrations.
Claim 3
Dependent Claim
37 words
A dispersive delay line as claimed in claim 1, wherein said transducers comprise a cylinder of electrostrictive material; said cylinder having two opposite faces respectively carrying a free electrode and another electrode coupled to said end portions.
Claim 4
Dependent Claim
23 words
A dispersive delay line as claimed in claim 1 further comprising mechanical impedance matching devices inserted between said transducers and said end portions.
Claim 5
Dependent Claim
19 words
A dispersive delay line according to claim 1, wherein said transducers are mounted in prolongation of said end portions.
Claim 6
Dependent Claim
14 words
A dispersive delay line as claimed in claim 1, wherein said axis is rectilinear.
Claim 7
Dependent Claim
14 words
A dispersive delay line as claimed in claim 1, wherein said axis is curvilinear.
Claim 8
Dependent Claim
15 words
A dispersive delay line according to claim 1, wherein said transducers surround said end portions.
Claim 9
Dependent Claim
18 words
A dispersive delay line as claimed in claim 7 further comprising absorbing means carried by said end portions.
Claim 10
Dependent Claim
21 words
A dispeRsive delay line as claimed in claim 1, wherein said waveguide has a constant annular section between said end portions.
Claim 11
Dependent Claim
23 words
A dispersive delay line as claimed in claim 9, wherein said end portions have the same inner and outer radii as said waveguide.
Claim 12
Dependent Claim
28 words
A dispersive delay line as claimed in claim 10, wherein at least one of said radii is gradually decreasing towards said transducers thus building up tapered end portions.
References Cited (Backward Citations)
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Cited
US2795709A
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US2910656A
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US3041556A
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US3264583A
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US3273146A
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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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |