US3347337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverberation loudspeaker
Assignee: Nippon Gakki Co Ltd
•
Filing: 1967-02-24
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Granted: 1967-10-17
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Expires: 1987-02-24
Abstract
No abstract record available.
Inventors
- 👤 Mochida Yasunori
- 👤 Ishimura Kazukiyo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:03
CPC Classifications
G; G10; G10K; G10K15/00; G10K15/08; G10K15/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A REVERBERATION FLAT SPEAKER WHEREIN A FLAT DIAPHRAGM IS SECURED AROUND THE PERIPHERY THEREOF TO A SUPPORTING FRAME CHARACTERIZED IN THAT ONE ENDS OF A PLURALITY OF SPRINGS ARE CONNECTED TO THE CENTER OF SAID DIAPHRAGM WHILE THE OTHERS TO THE POSITIONS ON SAID DIAPHRAGM.
Claim 2
Dependent Claim
45 words
A REVERBERATION FLAT SPEAKER WHEREIN A FLAT DIAPHRAGM IS SECURED AROUND THE PERIPHERY THEREOF TO A SUPPORTING FRAME CHARACTERIZED IN THAT ONE ENDS OF A PLURALITY OF SPRINGS ARE CONNECTED TO THE CENTER OF SAID DIAPHRAGM WHILE THE OTHERS TO THE POSITIONS ON SAID DIAPHRAGM.
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |