Patent US3073901A successfully refreshed from Google Patents.
US3073901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic blend circuit
Assignee: DYNA CO
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Filing: 1958-11-17
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Granted: 1963-01-15
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Expires: 1978-11-17
Abstract
No abstract record available.
Inventors
- 👤 Hafler David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:59
CPC Classifications
H; H04; H04S; H04S7/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
70 words
IN A STEREOPHONIC CHANNEL CONTROL SYSTEM, A FIRST CHANNEL, A SECOND CHANNEL, MEANS FOR APPLYING A FIRST AUDIO SIGNAL TO SAID FIRST CHANNEL, MEANS FOR APPLYING A SECOND AUDIO SIGNAL TO SAID SECOND CHANNEL, SAID SIGNALS BEING STEREOPHONICALLY RELATED, AND A BLEND CONTROL FOR SAID CHANNELS, SAID BLEND CONTROL CONSISTING OF A VARIABLE RESISTANCE AND A SWITCH CONNECTED IN SERIES BETWEEN SAID CHANNELS, SAID VARIABLE RESISTANCE BEING SUBSTANTIALLY LOGARITHMICALLY TAPERED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |