Patent US3456755A successfully refreshed from Google Patents.
US3456755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic loudspeakers
Assignee: Individual
•
Filing: 1963-07-29
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Granted: 1969-07-22
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Expires: 1983-07-29
Abstract
No abstract record available.
Inventors
- 👤 John Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:58
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/42; H04R7/00; H04R7/02; H04R7/12; H04R9/00; H04R9/06; H04R9/063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A LOUDSPEAKER COMPRISING A DRIVING MOTOR HAVING ACOUSTIC ENERGY-PRODUCING MEANS, A DIAPHRAGM RESILIENTLY CONNECTED TO SAID LOUDSPEAKER AND HYDRAULIC MEANS ADAPTED TO TRANSFER THE ENERGY FROM SAID PRODUCING MEANS TO SAID DIAPHRAGM, THE INNER SURFACE OF SAID DIAPHRAGM
Claim 2
Dependent Claim
38 words
A LOUDSPEAKER COMPRISING A DRIVING MOTOR HAVING ACOUSTIC ENERGY-PRODUCING MEANS, A DIAPHRAGM RESILIENTLY CONNECTED TO SAID LOUDSPEAKER AND HYDRAULIC MEANS ADAPTED TO TRANSFER THE ENERGY FROM SAID PRODUCING MEANS TO SAID DIAPHRAGM, THE INNER SURFACE OF SAID DIAPHRAGM
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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) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |