Patent US3308237A successfully refreshed from Google Patents.
US3308237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Columnar loudspeaker system
Assignee: International Jensen Inc
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Filing: 1963-05-31
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Granted: 1967-03-07
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Expires: 1983-05-31
Abstract
No abstract record available.
Inventors
- 👤 James F Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:09
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/40; H04R1/403
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A LOUDSPEAKER SYSTEM COMPRISING A LINEAR ARRAY OF A PLURALITY OF LOUDSPEAKERS AND AN ELECTRICAL SYSTEM ASSOCIATED THEREWITH, SAID ELECTRICAL SYSTEM COMPRISING A PLURALITY OF FILTER NETWORKS SO MODIFYING THE INDIVIDUAL SIGNAL CURRENTS APPLIED TO SAID LOUDSPEAKERS THAT THE SIGNAL CURRENT DISTRIBUTION ACROSS SAID ARRAY FROM CENTER TO EACH END SUBSTANTIALLY CONFORMS TO THE PROPERTIES OF THE TCHEBYSCHEFF POLYNOMIALS.
Claim 2
Dependent Claim
59 words
A LOUDSPEAKER SYSTEM COMPRISING A LINEAR ARRAY OF A PLURALITY OF LOUDSPEAKERS AND AN ELECTRICAL SYSTEM ASSOCIATED THEREWITH, SAID ELECTRICAL SYSTEM COMPRISING A PLURALITY OF FILTER NETWORKS SO MODIFYING THE INDIVIDUAL SIGNAL CURRENTS APPLIED TO SAID LOUDSPEAKERS THAT THE SIGNAL CURRENT DISTRIBUTION ACROSS SAID ARRAY FROM CENTER TO EACH END SUBSTANTIALLY CONFORMS TO THE PROPERTIES OF THE TCHEBYSCHEFF POLYNOMIALS.
References Cited (Backward Citations)
US3138667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |