Patent US4480021A successfully refreshed from Google Patents.
Patent US4596305A successfully refreshed from Google Patents.
US4596305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker box in the shape of a shell construction
Assignee: JAGBORN KURT
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Filing: 1982-12-06
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Granted: 1986-06-24
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Expires: 2002-12-06
Abstract
Abstract The invention relates to a loudspeaker box designed as a shell construction, where the outer and inner peripheral surfaces of the box are made of reinforced plastic and are preferably twin-curved with a continuously varying radius of curvature, where the distance between the outer and the inner shell is not constant and where the space between the shells is filled with a light material with good adhesion to the shells, preferably foam plastic. This design principle is intended to avoid natural resonances while at the same time ensuring low weight and high strength.
Inventors
- 👤 Tommy K. Jagborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:19
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/02; H04R1/021
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
A loudspeaker box comprising an inner plastic shell and an outer plastic shell, said shells being twin-curved, said shells being maintained in a spaced relationship wherein the radius of curvature of said shells is continuously varied so that the distance between the outer and inner shells is not constant, and being linked by a plastic foam material which adheres to the inner and outer shells and fills the space between them.
Claim 2
Dependent Claim
71 words
A loudspeaker box comprising an inner plastic shell and an outer plastic shell, said shells being twin-curved, said shells being maintained in a spaced relationship wherein the radius of curvature of said shells is continuously varied so that the distance between the outer and inner shells is not constant, and being linked by a plastic foam material which adheres to the inner and outer shells and fills the space between them.
Claim 3
Dependent Claim
28 words
The loudspeaker box in accordance with claim 1 wherein the shells are made of polyester or epoxy resin, wherein said resin is reinforced with glass or carbon fibers.
Claim 4
Dependent Claim
89 words
A loudspeaker box comprising an inner plastic shell and an outer plastic shell, said shells being maintained in a spaced relationship so that the distance between the outer and inner shells is not constant, and being linked by a plastic foam material which adheres to the inner and outer shells and fills the space between them, wherein the foam material within the shells of the box consists of a condensation polymer, wherein a gaseous substance which causes the material to foam is formed in the course of the condensation.
Claim 5
Dependent Claim
89 words
A loudspeaker box comprising an inner plastic shell and an outer plastic shell, said shells being maintained in a spaced relationship so that the distance between the outer and inner shells is not constant, and being linked by a plastic foam material which adheres to the inner and outer shells and fills the space between them, wherein the foam material within the shells of the box consists of a condensation polymer, wherein a gaseous substance which causes the material to foam is formed in the course of the condensation.
Claim 6
Dependent Claim
78 words
A loudspeaker box comprising an inner plastic shell and an outer plastic shell, said shells being maintained in a spaced relationship so that the distance between the outer and inner shells is not constant, and being linked by a plastic foam material which adheres to the inner and outer shells and fills the space between them, wherein the foam material within the shells of the box consists of an addition polymer to which a fermenting agent is added.
Claim 7
Dependent Claim
78 words
A loudspeaker box comprising an inner plastic shell and an outer plastic shell, said shells being maintained in a spaced relationship so that the distance between the outer and inner shells is not constant, and being linked by a plastic foam material which adheres to the inner and outer shells and fills the space between them, wherein the foam material within the shells of the box consists of an addition polymer to which a fermenting agent is added.
Claim 8
Dependent Claim
71 words
A loudspeaker box comprising an inner plastic shell and an outer plastic shell, said shells being maintained in a spaced relationship so that the distance between the outer and inner shells is not constant, and being linked by a plastic foam material which adheres to the inner and outer shells and fills the space between them, wherein the foam material within the shells of the box consists of a syntactic foam.
Claim 9
Dependent Claim
71 words
A loudspeaker box comprising an inner plastic shell and an outer plastic shell, said shells being maintained in a spaced relationship so that the distance between the outer and inner shells is not constant, and being linked by a plastic foam material which adheres to the inner and outer shells and fills the space between them, wherein the foam material within the shells of the box consists of a syntactic foam.
Claim 10
Dependent Claim
103 words
A loudspeaker box comprising an inner plastic shell and an outer plastic shell, said shells being maintained in a spaced relationship so that the distance between the outer and inner shells is not constant, and being linked by a plastic foam material which adheres to the inner and outer shells and fills the space between them, wherein the foam material within the walls of the box consists of a condensation polymer, wherein a gaseous substance which causes the material to foam is formed in the course of the condensation; an addition polymer to which a fermenting agent is added; or a syntactic foam.
Claim 11
Dependent Claim
103 words
A loudspeaker box comprising an inner plastic shell and an outer plastic shell, said shells being maintained in a spaced relationship so that the distance between the outer and inner shells is not constant, and being linked by a plastic foam material which adheres to the inner and outer shells and fills the space between them, wherein the foam material within the walls of the box consists of a condensation polymer, wherein a gaseous substance which causes the material to foam is formed in the course of the condensation; an addition polymer to which a fermenting agent is added; or a syntactic foam.
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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) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |