Patent US4079333A successfully refreshed from Google Patents.
US4079333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio amplifier
Assignee: Trio KK
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Filing: 1977-01-12
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Granted: 1978-03-14
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Expires: 1997-01-12
Abstract
Abstract An audio amplifier which processes mainly dynamic signals and which is provided with a plurality of amplifying systems each having a preamplifier and a main amplifier. A plurality of power sources are used to separately supply electric power to the respective amplifying systems, resulting in elimination of transient crosstalk.
Inventors
- 👤 Yoichiro Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:25
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A stereo audio amplifier comprising a first amplifying system including a first preamplifier and a first power amplifier responsive to said first preamplifier; a first power supply means including first rectifying means responsive to alternating current applied thereto for supplying power, said first preamplifier and said first power amplifier having power supplied thereto only by said first power supply means; a second amplifying system including a second preamplifier and a second power amplifier responsive to said second preamplifier; and a second power supply means including second rectifying means responsive to alternating current applied thereto for supplying power, said second preamplifier and said second power amplifier having power supplied thereto only by said second power supply means so that cross talk is completely eliminated between said first and second amplifying systems due to the coupling of (1) said first preamplifier and said first power amplifier only to said first power supply means and (2) said second preamplifier and said second power amplifier only to said second power supply means.
Claim 2
Dependent Claim
168 words
A stereo audio amplifier comprising a first amplifying system including a first preamplifier and a first power amplifier responsive to said first preamplifier; a first power supply means including first rectifying means responsive to alternating current applied thereto for supplying power, said first preamplifier and said first power amplifier having power supplied thereto only by said first power supply means; a second amplifying system including a second preamplifier and a second power amplifier responsive to said second preamplifier; and a second power supply means including second rectifying means responsive to alternating current applied thereto for supplying power, said second preamplifier and said second power amplifier having power supplied thereto only by said second power supply means so that cross talk is completely eliminated between said first and second amplifying systems due to the coupling of (1) said first preamplifier and said first power amplifier only to said first power supply means and (2) said second preamplifier and said second power amplifier only to said second power supply means.
References Cited (Backward Citations)
US3394235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |