Patent US3178512A successfully refreshed from Google Patents.
US3178512A
Expired / Lapsed
US
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Electrical sound reproducing device
Assignee: Artnell Co
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Filing: 1962-08-23
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Granted: 1965-04-13
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Expires: 1982-08-23
Abstract
No abstract record available.
Inventors
- 👤 William J Ashworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:43
CPC Classifications
H; H04; H04R; H04R23/00; H04R23/02; H04R1/00; H04R1/02; H04R1/021; H04R9/00; H04R9/06; H04R9/066
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
77 words
AN ELECTRICAL SOUND REPRODUCING SYSTEM COMPRISING AN AUDIO AMPLIFIER, AN OUTPUT TRANSFORMER FOR SAID AMPLIFIER ADAPTED TO ACTUATE A RELATIVELY MOVABLE ARMATURE MEMBER AND HAVING A PRIMARY WINDING OPERATIVELY CONNECTED WITH THE OUTPUT STAGE OF SAID AMPLIFIER, A SOUND BOARD, MEANS FOR ATTACHING THE ARMATURE MEMBER TO THE SOUND BOARD, MEANS FOR MOUNTING SAID TRANSFORMER IN OPERATIVE RELATION WITH SAID ARMATURE MEMBER, A SECONDARY WINDING ON SAID TRANSFORMER, AND A SPEAKER OPERATIVELY CONNECTED WITH SAID SECONDARY WINDING.
References Cited (Backward Citations)
US1726533A
Cited
US2127468A
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US2832842A
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US2957053A
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US3015695A
Cited
US3030455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |