US3557312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote telephone extension system
Assignee: Chromalloy American Corp
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Filing: 1969-07-22
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Granted: 1971-01-19
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Expires: 1989-07-22
Abstract
Abstract The system allows one to answer his telephone and talk to the caller by means of a remote transceiver which is carried by the person when he is away from his telephone. A base station unit develops and transmits to the transceiver a ringing signal to alert the person that his telephone is ringing. The transceiver is operated to transmit an answering signal which has both a frequency-coded component and a speech-modulated component to answer the telephone. Amplitude comparison and timing circuits are used, together with a frequency analyzer to prevent unwanted answering of the telephone. Means are provided for terminating the call in response to either hanging up the calling telephone, receipt of a dial tone, or receipt of a warning signal on the telephone after hang-up. Also, means are provided for automatic hang-up after a period of time in which no coded signal from the remote transceiver or voice signals from the caller are received. Remote dialing means are provided in which the answering circuitry is used in the initiation of calls from the remote transceiver, as well as in the answering of incoming calls.
Inventors
- 👤 Joseph Herbert Vogelman
- 👤 Kenrick O Stephenson Jr
- 👤 Bernard Feinerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:36
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/72502; H04M1/72505
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
319 words
A telephone extension system providing for conversation between a telephone caller using the telephone lines to a telephone subscriber at a remote station from his telephone base station comprising, means for developing a ring signal in response to the ringing of an incoming call to said base station telephone from a distant telephone, a speech signal representative of the speech from said distant telephone, a speech signal representative of the speech from said distant telephone and hang-up signal after the termination of speech from said distant telephone; base station transmitting and receiving means for transmitting said ring and speech signals to said remote station and for receiving signals transmitted from said remote station, said base station transmitting means including means for feeding speech signals from the telephone lines to the transmitter of said base station having a compression amplifier operatively associated therewith; remote station dialing means for generating dialing signals corresponding to the telephone number of said distant telephone; remote station transmitting and receiving means for receiving said signals transmitted from said base station and for transmitting a code signal and a speech modulation signal; means for modifying the frequency of said code signal in accordance with said dialing signal; and control means initially responsive to said code signal for placing an impedance termination across the lines of said base station telephone lines whereby said telephone number is dialed, said control means being responsive to said code signal subsequent to the answering of said distant telephone for maintaining an impedance termination across said base station telephone lines to couple the speech from said distant telephone to said base station transmitting and receiving means and for coupling the speech of said speech modulation signal to said base station telephone, said control means further being responsive to said hang-up signal for removing said impedance termination from said base station telephone lines after the termination of said speech from said distant telephone.
Claim 2
Dependent Claim
319 words
A telephone extension system providing for conversation between a telephone caller using the telephone lines to a telephone subscriber at a remote station from his telephone base station comprising, means for developing a ring signal in response to the ringing of an incoming call to said base station telephone from a distant telephone, a speech signal representative of the speech from said distant telephone, a speech signal representative of the speech from said distant telephone and hang-up signal after the termination of speech from said distant telephone; base station transmitting and receiving means for transmitting said ring and speech signals to said remote station and for receiving signals transmitted from said remote station, said base station transmitting means including means for feeding speech signals from the telephone lines to the transmitter of said base station having a compression amplifier operatively associated therewith; remote station dialing means for generating dialing signals corresponding to the telephone number of said distant telephone; remote station transmitting and receiving means for receiving said signals transmitted from said base station and for transmitting a code signal and a speech modulation signal; means for modifying the frequency of said code signal in accordance with said dialing signal; and control means initially responsive to said code signal for placing an impedance termination across the lines of said base station telephone lines whereby said telephone number is dialed, said control means being responsive to said code signal subsequent to the answering of said distant telephone for maintaining an impedance termination across said base station telephone lines to couple the speech from said distant telephone to said base station transmitting and receiving means and for coupling the speech of said speech modulation signal to said base station telephone, said control means further being responsive to said hang-up signal for removing said impedance termination from said base station telephone lines after the termination of said speech from said distant telephone.
Claim 3
Dependent Claim
17 words
Apparatus as in claim 1 including a band-pass filter connected in the input to said compression amplifier.
Claim 4
Dependent Claim
21 words
Apparatus as in claim 1 in which the remote transmitter includes a microphone, and a speech compressor connected to said microphone.
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |