US3236958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker system
Assignee: ELECTRONIC RES ASSOCIATES Inc
•
Filing: 1961-04-25
•
Granted: 1966-02-22
•
Expires: 1981-04-25
Abstract
No abstract record available.
Inventors
- 👤 Abraham B Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:38
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/04; H04R7/06; H04R7/10; H04R9/00; H04R9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
IN A LOUDSPEAKER SYSTEM, A MAGNETIC STRUCTURE AND SUPPORT THEREFORE COMPRISING A SUPPORT MEMBER HAVING AN ORIFICE THEREIN, A RING MAGNET SYMMETRICALLY SITUATED IN SAID ORIFICE, TOP AND BOTTOM PLATES OF FERROMAGNETIC MATERIAL AND HAVING MAJOR DIMENSIONS WHICH EXCEED THE DIAMETER OF SAID ORIFICE, MEANS FOR SECURING SAID PLATES TOGETHER ON OPPOSITE SIDES OF SAID ORIFICE SUCH THAT SAID RING MAGNET IS CLAMPED THEREBETWEEN, SAID TOP PLATE HAVING AN ORIFICE THEREIN, A CYLINDRICAL POLE PIECE SECURED TO SAID BOTTOM PLATE SUCH THAT IT SYMMETRICALLY EXTENDS THROUGH SAID RING MAGNET INTO SAID TOP PLATE ORIFICE, A VOICE COIL RETAINED ON A VOICE COIL FORM, AND A SPIDER SECURED TO SAID VOICE COIL FORM AND TO SAID TOP PLATE TO SYMMETRICALLY SUPPORT SAID VOICE COIL IN THE GAP FORMED BY THE ORIFICE IN SAID TOP PLATE AND SAID POLE PIECE.
Claim 2
Dependent Claim
138 words
IN A LOUDSPEAKER SYSTEM, A MAGNETIC STRUCTURE AND SUPPORT THEREFORE COMPRISING A SUPPORT MEMBER HAVING AN ORIFICE THEREIN, A RING MAGNET SYMMETRICALLY SITUATED IN SAID ORIFICE, TOP AND BOTTOM PLATES OF FERROMAGNETIC MATERIAL AND HAVING MAJOR DIMENSIONS WHICH EXCEED THE DIAMETER OF SAID ORIFICE, MEANS FOR SECURING SAID PLATES TOGETHER ON OPPOSITE SIDES OF SAID ORIFICE SUCH THAT SAID RING MAGNET IS CLAMPED THEREBETWEEN, SAID TOP PLATE HAVING AN ORIFICE THEREIN, A CYLINDRICAL POLE PIECE SECURED TO SAID BOTTOM PLATE SUCH THAT IT SYMMETRICALLY EXTENDS THROUGH SAID RING MAGNET INTO SAID TOP PLATE ORIFICE, A VOICE COIL RETAINED ON A VOICE COIL FORM, AND A SPIDER SECURED TO SAID VOICE COIL FORM AND TO SAID TOP PLATE TO SYMMETRICALLY SUPPORT SAID VOICE COIL IN THE GAP FORMED BY THE ORIFICE IN SAID TOP PLATE AND SAID POLE PIECE.
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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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |