Patent US892459A successfully refreshed from Google Patents.
Patent US3636271A successfully refreshed from Google Patents.
US3636271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand microphone for sound recording and reproducing instruments with ac switching
Assignee: Olympia Werke AG
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Filing: 1969-12-09
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Granted: 1972-01-18
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Expires: 1989-12-09
Abstract
Abstract A hand microphone for use with sound recording and reproducing instruments and including a control portion from which various control functions can be initiated in the instrument, one of which control functions involves switching an alternating voltage circuit, the unit for switching such circuit including a transistor having its collector-emitter path connected in series in such alternating voltage circuit and a mechanically stationary electronic switch connected to the base of the transistor for applying thereto, when the electronic switch is closed, a bias voltage which causes the transistor collector-emitter path to conduct current in both directions.
Inventors
- 👤 Jorg Rodenbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:45
CPC Classifications
A; A47; A47B; A47B95/00; A47B95/02; G; G11; G11B; G11B31/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
In a hand microphone for use with, and electrically connectable to, a sound recording and reproducing instrument containing at least one alternating voltage circuit to be controlled from the microphone, the improvement wherein said microphone contains circuit control means comprising: a transistor; connection means connected to the collector and emitter of said transistor and connectable to the machine for connecting the collector-emitter path of said transistor in series with said at least one alternating voltage circuit for permitting the conduction state of said transistor to control the operation of such circuit; mechanically stationary electronic switch means connected to said transistor, said switch means defining a conductive path which is selectively closeable for placing said transistor in a conductive state with respect to all amplitude levels of the alternating voltage in such circuit; and operating means connected to said switch means for controlling the switching state thereof.
Claim 2
Dependent Claim
146 words
In a hand microphone for use with, and electrically connectable to, a sound recording and reproducing instrument containing at least one alternating voltage circuit to be controlled from the microphone, the improvement wherein said microphone contains circuit control means comprising: a transistor; connection means connected to the collector and emitter of said transistor and connectable to the machine for connecting the collector-emitter path of said transistor in series with said at least one alternating voltage circuit for permitting the conduction state of said transistor to control the operation of such circuit; mechanically stationary electronic switch means connected to said transistor, said switch means defining a conductive path which is selectively closeable for placing said transistor in a conductive state with respect to all amplitude levels of the alternating voltage in such circuit; and operating means connected to said switch means for controlling the switching state thereof.
Claim 3
Dependent Claim
50 words
An arrangement as defined in claim 1 wherein said switch means comprises a bias voltage source and is connected to the base of said transistor for applying a base bias voltage which maintains a forward base current for either direction of current flow through the collector-emitter path of said transistor.
Claim 4
Dependent Claim
48 words
An arrangement as defined in claim 2 further comprising additional electronic switch means connectable to control other circuits in the instrument and each defining a conductive path which is selectively closeable, and additional operating means connected to said additional switch means for individually controlling the switching states thereof.
Claim 5
Dependent Claim
102 words
An arrangement as defined in claim 3 wherein said operating means and said additional operating means together comprise a common conductive strip connectable to a voltage source and a plurality of individual conductive coatings spaced from said strip and each forming part of a respective operating means, and wherein said electronic switch means and additional electronic switch means are of a type whose conductive path is closed by the voltage applied thereto when said strip is connected to such voltage source and the gap between said strip and a respective coating is bridged by the finger of an individual using the instrument.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |