US3213209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker
Assignee: Individual
•
Filing: 1962-08-07
•
Granted: 1965-10-19
•
Expires: 1982-08-07
Abstract
No abstract record available.
Inventors
- 👤 Eduart R Doelitzsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:36
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/122
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
IN A LOUDSPEAKER HAVING A DRIVER, A VOICE COIL IN THE FIELD OF SAID DRIVER, A WOOFER CONE, AND A SUPPORT FRAME FOR SAID CONE MOUNTED ON SAID DRIVER; AN ELONGATED TUBE CARRYING AT ITS REAR END SAID VOICE COIL, A SPIDER ATTACHED TO SAID DRIVER AND TO SAID TUBE NEXT TO SAID VOICE COIL, MEANS SECURING THE APEX END OF SAID WOOFER CONE TO SAID TUBE NEXT TO SAID SPIDER, AND A TWEETER CONE CARRIED BY SAID TUBE AT THE FORWARD END THEREOF, AND A REVERSE CONE
Claim 2
Dependent Claim
88 words
IN A LOUDSPEAKER HAVING A DRIVER, A VOICE COIL IN THE FIELD OF SAID DRIVER, A WOOFER CONE, AND A SUPPORT FRAME FOR SAID CONE MOUNTED ON SAID DRIVER; AN ELONGATED TUBE CARRYING AT ITS REAR END SAID VOICE COIL, A SPIDER ATTACHED TO SAID DRIVER AND TO SAID TUBE NEXT TO SAID VOICE COIL, MEANS SECURING THE APEX END OF SAID WOOFER CONE TO SAID TUBE NEXT TO SAID SPIDER, AND A TWEETER CONE CARRIED BY SAID TUBE AT THE FORWARD END THEREOF, AND A REVERSE 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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |