US4029171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Membrane for electroacoustic converter systems
Assignee: Individual
•
Filing: 1975-08-11
•
Granted: 1977-06-14
•
Expires: 1995-08-11
Abstract
Abstract A diaphragm having a flat multi-layer body with at least one layer of viscoelastic material.
Inventors
- 👤 Josef Wilhelm Manger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:14
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/04; H04R7/06; H04R7/10; B; B32; B32B; B32B27/00; B32B27/06; B32B25/00; B32B25/04; B32B25/08; B32B27/30; B32B27/304; B32B27/36; B32B27/365; H04R9/00; H04R9/06; H04R9/063; B32B2327/00; B32B2327/12; B32B2367/00; B32B2369/00; B32B2457/00; H04R2440/00; H04R2440/01
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
70 words
Diaphragm having substantial viscoelastic properties for an electroacoustic transducer system and coupled to a driving means therefor, consisting of a flat multi-layer body which has at least one layer of a substantially viscoelastic material with a substantially constant maximum damping factor over a temperature range of substantially more than 10° C and at least one layer of foil with a modulus of elasticity of more than 10,000 kg/cm 2 .
Claim 2
Dependent Claim
70 words
Diaphragm having substantial viscoelastic properties for an electroacoustic transducer system and coupled to a driving means therefor, consisting of a flat multi-layer body which has at least one layer of a substantially viscoelastic material with a substantially constant maximum damping factor over a temperature range of substantially more than 10° C and at least one layer of foil with a modulus of elasticity of more than 10,000 kg/cm 2 .
Claim 3
Dependent Claim
20 words
Diaphragm as in claim 1, wherein said viscoelastic material consists of a graft-type polymer of methacrylic-acid methylester on vinylacetate/2-ethyl-hexyl-acrylate/dibutyl-maleate/crotonic-acid copolymer.
Claim 4
Dependent Claim
21 words
Diaphragm as in claim 1, wherein said viscoelastic material consists of a graft-type polymer of methacrylic-acid methylester/acrylic acid on vinylacetate/2-ethyl-hexyl-acrylate/dibutyl-maleate/crotonic-acid copolymer.
Claim 5
Dependent Claim
12 words
Diaphragm as in claim 1, wherein said foil consists of a polyester-film.
Claim 6
Dependent Claim
12 words
Diaphragm as in claim 1, wherein said foil consists of a polycarbonate-film.
Claim 7
Dependent Claim
12 words
Diaphragm as in claim 1, wherein said foil consists of a polyvinylfluoride-film.
Claim 8
Dependent Claim
23 words
Diaphragm as in claim 1, the multi-layer body containing a middle layer of viscoelastic material and outer layers of foil on both sides.
Claim 9
Dependent Claim
29 words
Diaphragm as in claim 7, wherein said middle layer has a layer-thickness of 0.2 to 0.4 mm and each outer layer has a layer-thickness of 0.01 to 0.04 mm.
Claim 10
Dependent Claim
75 words
Electroacoustic transducer system with a flat diaphragm having substantial viscoelastic properties secured to a fixed part and coupled to a moving coil, wherein the diaphragm consists of a multi-layer body which has at least one diaphragm-coupled layer of foil with a modulus of elasticity of more than 10,000 kg/cm 2 , and at least one layer of viscoelastic material with a substantially constant maximum damping factor over a temperature range of more than 10° C.
Claim 11
Dependent Claim
75 words
Electroacoustic transducer system with a flat diaphragm having substantial viscoelastic properties secured to a fixed part and coupled to a moving coil, wherein the diaphragm consists of a multi-layer body which has at least one diaphragm-coupled layer of foil with a modulus of elasticity of more than 10,000 kg/cm 2 , and at least one layer of viscoelastic material with a substantially constant maximum damping factor over a temperature range of more than 10° C.
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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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |