US3351719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker assembly
Assignee: ELECTRONIC RES ASSOCIATES Inc
•
Filing: 1964-02-05
•
Granted: 1967-11-07
•
Expires: 1984-02-05
Abstract
No abstract record available.
Inventors
- 👤 Schoengold Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:36
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/06; H04R9/063; H04R7/00; H04R7/02; H04R7/04; H04R7/12; H04R7/16; H04R7/18; H04R7/20; H04R9/02; H04R9/04; H04R9/045; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49005
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
35 words
IN A LOUDSPEAKER A DIAPHRAGM, AND A FRAME SUPPORTING THE DIAPHRAGM ADJACENT THE PERIPHERY ONLY OF THE DIAPHRAGM THEREOF, SAID DIAPHRAGM AND FRAME BEING A UNITARY STRUCTURE COMPOSED SUBSTANTIALLY ENTIRELY OF STIFF CELLULAR PLASTIC MATERIAL.
References Cited (Backward Citations)
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US2124834A
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US2396825A
Cited
US2789161A
Cited
US3236958A
Cited
US3172498A
Cited
FR1326414A
Cited
US3143183A
Cited
US3284581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |