Patent US3235675A successfully refreshed from Google Patents.
US3235675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic material and sound reproducing device constructed therefrom
Assignee: Leyman Corp
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Filing: 1954-12-23
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Granted: 1966-02-15
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Expires: 1974-12-23
Abstract
No abstract record available.
Inventors
- 👤 Walter S Blume
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:33
CPC Classifications
H; H04; H04R; H04R13/00; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/08; H01F1/083; H04R15/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A SOUND REPRODUCING DEVICE COMPRISING A GENERALLY HOLLOW CYLINDRICAL HOUSING OPEN AT ONE FACE AND CLOSED AT THE OTHER FACE THEREOF, A CENTRAL CORE EXTENDING INWARDLY FROM SAID CLOSED FACE, A DIAPHRAGM IN ENGAGEMENT WITH THE PERIPHERAL EDGES OF SAID OPEN FACE IN SPACED RELATION TO SAID CORE, AND A COIL OF INSULATED WIRE SURROUNDING SAID CORE WITHIN SAID HOUSING AND ADAPTED TO CONDUCT ELECTRIC CURRENT THERETHROUGH, SAID HOUSING, CORE AND DIAPHRAGM COMPRISING MOLDINGS OF A RESILIENTLY DEFORMABLE DISPERSION OF PARTICLES IN A PLASTIC MATRIX, IN WHICH DISPERSION A SUBSTANTIAL PORTION OF SAID PARTICLES ARE SHORT RIGHT CYLINDERS OF A PERMANENT MAGNETIC MATERIAL.
Claim 2
Dependent Claim
103 words
A SOUND REPRODUCING DEVICE COMPRISING A GENERALLY HOLLOW CYLINDRICAL HOUSING OPEN AT ONE FACE AND CLOSED AT THE OTHER FACE THEREOF, A CENTRAL CORE EXTENDING INWARDLY FROM SAID CLOSED FACE, A DIAPHRAGM IN ENGAGEMENT WITH THE PERIPHERAL EDGES OF SAID OPEN FACE IN SPACED RELATION TO SAID CORE, AND A COIL OF INSULATED WIRE SURROUNDING SAID CORE WITHIN SAID HOUSING AND ADAPTED TO CONDUCT ELECTRIC CURRENT THERETHROUGH, SAID HOUSING, CORE AND DIAPHRAGM COMPRISING MOLDINGS OF A RESILIENTLY DEFORMABLE DISPERSION OF PARTICLES IN A PLASTIC MATRIX, IN WHICH DISPERSION A SUBSTANTIAL PORTION OF SAID PARTICLES ARE SHORT RIGHT CYLINDERS OF A PERMANENT MAGNETIC MATERIAL.
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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) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |