Patent US4544805A successfully refreshed from Google Patents.
US4544805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plane speaker
Assignee: Individual
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Filing: 1982-09-17
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Granted: 1985-10-01
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Expires: 2002-09-17
Abstract
Abstract A plane speaker comprises a frame having an opening; a diaphragm facing said opening and having secured its peripheral edge portion to the frame; an actuating plate attached perpendicularly to the back of said diaphragm; a coil mounted on the surface of said actuating plate; and magnets attached to the frame opposite to each other in relation to said coil.
Inventors
- 👤 Tadashi Sawafuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:57
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/04; H04R9/00; H04R9/06; H04R9/063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A plane speaker comprises a frame having an opening portion; a plane diaphragm which has its peripheral edge portion secured to said frame facing said opening portion of the frame and has been provided with a number of parallel cone-shaped projections; a folded actuating plate which is formed separately from said diaphragm and attached perpendicularly to the back only of said diaphragm; a coil printed on both surfaces of the actuating plate; and a magnet disposed on the frame oppositely to said coil, said actuating plate made by repeatedly folding a piece of flexible web zigzag in the longitudinal direction and attaching one edge thereof to the back of the diaphragm.
Claim 2
Dependent Claim
111 words
A plane speaker comprises a frame having an opening portion; a plane diaphragm which has its peripheral edge portion secured to said frame facing said opening portion of the frame and has been provided with a number of parallel cone-shaped projections; a folded actuating plate which is formed separately from said diaphragm and attached perpendicularly to the back only of said diaphragm; a coil printed on both surfaces of the actuating plate; and a magnet disposed on the frame oppositely to said coil, said actuating plate made by repeatedly folding a piece of flexible web zigzag in the longitudinal direction and attaching one edge thereof to the back of the diaphragm.
References Cited (Backward Citations)
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Cited
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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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |