Patent US3812301A successfully refreshed from Google Patents.
US3812301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spherical loudspeaker
Assignee: Individual
•
Filing: 1973-03-06
•
Granted: 1974-05-21
•
Expires: 1993-03-06
Abstract
Abstract A loudspeaker including a radiating cone speaker in a spherical flexible sealed enclosure which is capable of radiating sound in response to variations of internal acoustic waves, and having an inverted impedance matching horn located between the radiating cone and the external environment and radiating via an opening in the enclosure.
Inventors
- 👤 U Lahti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:33
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/02; H04R1/021; G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/28
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
124 words
A loudspeaker having a rimmed diaphragm having a concave side, a spider supporting said diaphragm and a motor for driving said diaphragm, a substantially spherical enclosure, said enclosure having a thin resilient and acoustically radiative but acoustically imperforate wall, a horn extending from the rim of said diaphragm to said wall, said horn being an exponential horn and having its smaller end at said wall and its larger opening at said diaphragm, said larger opening being approximately the size of said diaphragm and said small opening having substantially the size of an opening in said wall and mating with said opening in said wall, said enclosure being substantially undamped internally and radiating acoustic energy substantially omnidirectionally in response to acoustic vibrations of said diaphragm.
Claim 2
Dependent Claim
124 words
A loudspeaker having a rimmed diaphragm having a concave side, a spider supporting said diaphragm and a motor for driving said diaphragm, a substantially spherical enclosure, said enclosure having a thin resilient and acoustically radiative but acoustically imperforate wall, a horn extending from the rim of said diaphragm to said wall, said horn being an exponential horn and having its smaller end at said wall and its larger opening at said diaphragm, said larger opening being approximately the size of said diaphragm and said small opening having substantially the size of an opening in said wall and mating with said opening in said wall, said enclosure being substantially undamped internally and radiating acoustic energy substantially omnidirectionally in response to acoustic vibrations of said diaphragm.
Claim 3
Dependent Claim
17 words
The combination according to claim 1, wherein said horn and said spherical enclosure are fabricated of plastic.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |