US3594515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound reflecting telephone casing
Assignee: Associated Electrical Industries Ltd
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Filing: 1968-07-12
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Granted: 1971-07-20
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Expires: 1988-07-12
Abstract
Abstract A telephone instrument in which either the microphone or the receiver transducer is used in the ''''on-hook'''' condition to emit tone calling signals. The instrument casing is shaped to provide recesses for the microphone and receiver housings such as to define, with the housing of the tone-emitting transducer, a cavity which provides acoustic enhancement of the emitted tone. The transistor amplifier within the casing is connected to act as an oscillator to generate the calling tone in the ''''on-hook'''' condition and as a speech current amplifier in the ''''off-hook'''' condition.
Inventors
- 👤 Ronald Ernest Charles Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:44
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M19/00; H04M19/02; H04M19/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
A telephone instrument comprising a base including casing and a handset which in the on-hook condition rests on said casing and which includes a microphone transducer and microphone housing, a receiver transducer and receiver housing and a handgrip portion extending between said housings, speech signal amplifier means mounted within said casing, means for connecting said amplifier means, in the on-hook condition, in an oscillatory circuit arranged to supply an oscillatory signal to one of said transducers, means for energizing said oscillatory circuit in dependence upon signals received by said instrument, said oscillatory signal being emitted by said one transducer as a tone calling signal, and means for providing acoustic enhancement of said tone calling signal, said acoustic enhancement providing means including a recess in said casing for defining, in the onhook condition, a substantially wedge-shaped cavity between the housing of said one of said transducers and said casing.
Claim 2
Dependent Claim
148 words
A telephone instrument comprising a base including casing and a handset which in the on-hook condition rests on said casing and which includes a microphone transducer and microphone housing, a receiver transducer and receiver housing and a handgrip portion extending between said housings, speech signal amplifier means mounted within said casing, means for connecting said amplifier means, in the on-hook condition, in an oscillatory circuit arranged to supply an oscillatory signal to one of said transducers, means for energizing said oscillatory circuit in dependence upon signals received by said instrument, said oscillatory signal being emitted by said one transducer as a tone calling signal, and means for providing acoustic enhancement of said tone calling signal, said acoustic enhancement providing means including a recess in said casing for defining, in the onhook condition, a substantially wedge-shaped cavity between the housing of said one of said transducers and said casing.
Claim 3
Dependent Claim
69 words
A telephone instrument in accordance with claim 1 wherein the casing is formed with a second recess in which the housing of the other transducer of the handset is located when the handset rests on said casing in the normal position, this second recess being so shaped that if the handset is placed the wrong way round on the casing acoustic enhancement of tone calling signals is again provided.
Claim 4
Dependent Claim
59 words
A telephone instrument in accordance with claim 2 wherein the second recess has inwardly sloping and rounded sidewalls such that if the handset is placed askew on the casing that part of the handset which is in engagement with said sidewalls will tend to slide so that the handset will tend to align itself centrally on the instrument casing.
References Cited (Backward Citations)
US2392321A
Cited
US2699469A
Cited
US2850583A
Cited
DE1058562B
Cited
US2972021A
Cited
US3073911A
Cited
US3459899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |