US3079463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereo sound system
Assignee: CROSBY ELECTRONICS Inc
•
Filing: 1960-02-10
•
Granted: 1963-02-26
•
Expires: 1980-02-10
Abstract
No abstract record available.
Inventors
- 👤 Feldman Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:07
CPC Classifications
H; H04; H04S; H04S1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A STEREO SYSTEM COMPRISING STEREO AMPLIFIERS HAVING INDIVIDUAL VOLUME CONTROLS, FOR DRIVING STEREO SPEAKERS A AND B, SAID AMPLIFIERS BEING CHANNEL A AND CHANNEL B AMPLIFIERS, EACH HAVING AN INPUT AND AN OUTPUT A NORMALLY OPEN NEGATIVE CROSSOVER FEEDBACK CONNECTION FROM THE OUTPUT OF CHANNEL B AMPLIFIER TO THE INPUT OF CHANNEL A AMPLIFIER, SAID NEGATIVE CROSSOVER FEEDBACK CONNECTION SERVING TO PRODUCE A NULL OR SUBSTANTIALLY NULL OUTPUT FROM CHANNEL A WHEN THE A AND B INPUTS AND OUTPUTS ARE BALANCED, AND MEANS TO TEMPORARILY CLOSE THE SAID CROSSOVER FEEDBACK CONNECTION, WHEREBY THE VOLUME CONTROL OF CHANNEL B MAY BE ADJUSTED UNTIL THERE IS A NULL OR SUBSTANTIALLY NULL OUTPUT FROM AMPLIFIER A IN ORDER TO BALANCE THE AMPLIFIER OUTPUTS.
Claim 2
Dependent Claim
120 words
A STEREO SYSTEM COMPRISING STEREO AMPLIFIERS HAVING INDIVIDUAL VOLUME CONTROLS, FOR DRIVING STEREO SPEAKERS A AND B, SAID AMPLIFIERS BEING CHANNEL A AND CHANNEL B AMPLIFIERS, EACH HAVING AN INPUT AND AN OUTPUT A NORMALLY OPEN NEGATIVE CROSSOVER FEEDBACK CONNECTION FROM THE OUTPUT OF CHANNEL B AMPLIFIER TO THE INPUT OF CHANNEL A AMPLIFIER, SAID NEGATIVE CROSSOVER FEEDBACK CONNECTION SERVING TO PRODUCE A NULL OR SUBSTANTIALLY NULL OUTPUT FROM CHANNEL A WHEN THE A AND B INPUTS AND OUTPUTS ARE BALANCED, AND MEANS TO TEMPORARILY CLOSE THE SAID CROSSOVER FEEDBACK CONNECTION, WHEREBY THE VOLUME CONTROL OF CHANNEL B MAY BE ADJUSTED UNTIL THERE IS A NULL OR SUBSTANTIALLY NULL OUTPUT FROM AMPLIFIER A IN ORDER TO BALANCE THE AMPLIFIER OUTPUTS.
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) | 1966-02-25 | 1966-08-27 | 1967-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-25 | 1970-08-27 | 1971-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-25 | 1974-08-27 | 1975-02-26 | $7700.00 | Window Closed / Lapsed |