US3767004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeakers
Assignee: Individual
•
Filing: 1971-03-19
•
Granted: 1973-10-23
•
Expires: 1991-03-19
Abstract
Abstract A loudspeaker is provided in which a thin surround is employed for the speaker cone of impervious foam material, the surround being characterized by omni-directional elastic tension and being secured between the cone and the support.
Inventors
- 👤 A Liebscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:28
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/06; H04R7/00; H04R7/16; H04R7/18; H04R7/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
90 words
In a loudspeaker having a frame, a speaker cone, driving means for said cone in said frame, and supporting means in said frame for said cone and said driving means and providing substantially the entire support therefor, the improvement which comprises a thin surround of stabilized impervious closed pore silicone rubber foam characterized by omni-directional elastic tension secured to the periphery of the cone and to said frame, said surround being disposed in non-supporting and non-stressing relation to said cone and providing front to back air separation for said cone.
Claim 2
Dependent Claim
90 words
In a loudspeaker having a frame, a speaker cone, driving means for said cone in said frame, and supporting means in said frame for said cone and said driving means and providing substantially the entire support therefor, the improvement which comprises a thin surround of stabilized impervious closed pore silicone rubber foam characterized by omni-directional elastic tension secured to the periphery of the cone and to said frame, said surround being disposed in non-supporting and non-stressing relation to said cone and providing front to back air separation for said cone.
Claim 3
Dependent Claim
38 words
A loudspeaker as defined in claim 1 in which said surround is in a flat non-stressed mode when inactive and stretches to accommodate equally forward or backward motion substantially free from stress on the periphery of the cone.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |