US3761640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone dialer with two different pulse rates
Assignee: Alcatel CIT SA
•
Filing: 1970-11-13
•
Granted: 1973-09-25
•
Expires: 1990-11-13
Abstract
Abstract A pulse source, primarily for use with a keyboard in a telephone network, for providing a pulse output compatible with both keyboard and dial telephone networks. The telephone keyboard activates a pulse generator which produces an output compatible with keyboard telephone networks. If the network is of the keyboard type then the output of the generator is applied directly to the telephone network. If the network is of the dial type then the output of the pulse generator is applied to a memory device which stores the output of the pulse generator and generates in response thereto a pulse train at a second rate compatible with a dial network and which corresponds to the output of the keyboard.
Inventors
- 👤 C Monin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:22
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/02; H; H03; H03K; H03K3/00; H03K3/64; H03K3/72; H03K3/78; H04; H04M; H04M1/00; H04M1/26; H04M1/27; H04M1/272; H04M1/2725; H04M1/30
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
195 words
A keyboard network for use in an automatic telephone network, said keyboard network comprising, a. pulse generating means for supplying a decimal coded pulse signal at a first repetition rate; b. switch means connected to the output of said pulse generating means, said switch means having a first and second state, whereby when said switch means are in said first state said pulse generating means is coupled directly to a telephone line to provide the output of said keyboard network; c. memory means, connected to said pulse generating means when said switch means are in said second state, for receiving and storing said pulse signal at said first repetition rate and for generating in response to said pulse signal at said first repetition rAte a decimal coded pulse signal at a second repetition rate, said first repetition rate being high relative to said second repetition rate; and d. means coupled to said memory for interrupting at said second rate the current in said line whereby when said switch means are in said second state said memory means controls the connection of the output of said keyboard network to said line through said means for interrupting.
Claim 2
Dependent Claim
195 words
A keyboard network for use in an automatic telephone network, said keyboard network comprising, a. pulse generating means for supplying a decimal coded pulse signal at a first repetition rate; b. switch means connected to the output of said pulse generating means, said switch means having a first and second state, whereby when said switch means are in said first state said pulse generating means is coupled directly to a telephone line to provide the output of said keyboard network; c. memory means, connected to said pulse generating means when said switch means are in said second state, for receiving and storing said pulse signal at said first repetition rate and for generating in response to said pulse signal at said first repetition rAte a decimal coded pulse signal at a second repetition rate, said first repetition rate being high relative to said second repetition rate; and d. means coupled to said memory for interrupting at said second rate the current in said line whereby when said switch means are in said second state said memory means controls the connection of the output of said keyboard network to said line through said means for interrupting.
Claim 3
Dependent Claim
15 words
A keyboard network as claimed in claim 1, wherein said first repetition rate is constant.
Claim 4
Dependent Claim
16 words
A pulse source as claimed in claim 2, wherein said first repetition rate is 500 Hz.
Claim 5
Dependent Claim
20 words
A keyboard network as claimed in claim 1 wherein said memory means comprises a second logic circuit including a buffer.
Claim 6
Dependent Claim
23 words
A keyboard network as claimed in claim 4, wherein the second logic circuit is constructed as a metal oxide silicon (MOS) integrated circuit.
Claim 7
Dependent Claim
63 words
A keyboard network as claimed in claim 1, wherein each input of said pulse generating means is connected to receive a respective control signal and said pulse generating means provides at its output, in response to the receipt of a control signal at its input, a pulse train in which the number of pulses is significant of the signal received at its input.
Claim 8
Dependent Claim
39 words
A keyboard network as claimed in claim 6, wherein said first repetition rate is chosen to ensure that a pulse train having a predetermined maximum length can be formed during a predetermined minimum duration of the corresponding control signal.
Claim 9
Dependent Claim
26 words
A keyboard network as claimed in claim 1, wherein each pulse provided by said pulse generating means comprises a predetermined and fixed number of elementary pulses.
Claim 10
Dependent Claim
77 words
A keyboard network as claimed in claim 6 wherein said interrupting means includes a first relay connected to said memory means said first relay having its contacts arranged to be connected in a line of said network said first relay being operated by pulses from said memory means such that its contacts open and close synchronously with said pulses at said second repetition rate to transfer said pulses to the telephone line by interrupting the line current.
Claim 11
Dependent Claim
36 words
A keyboard network as claimed in claim 9, including a capacitor means connected across the telephone lines for maintaining energization, of said keyboard network and an associated telephone instrument, during the interruptions of the line current.
Claim 12
Dependent Claim
31 words
A keyboard network as claimed in claim 9, including an accumulator means for maintaining energization, of said keyboard network and an associated telephone instrument, during the interruptions of the line current.
Claim 13
Dependent Claim
60 words
A keyboard network as claimed in claim 9, including a second relay means connected to said memory for providing a loop in the telephone line during transmission of the calling pulses on the line whereby a handset of the associated telephone instrument is isolated from the line so that it is not affected by the interrruptions of the line current.
Claim 14
Dependent Claim
52 words
A keyboard network as claimed in claim 9, further comprising a keyboard with a plurality of keys wherein each input of the pulse generating means is connected to receive a respective control signal from a respective key of said keyboard of an associated telephone instrument thereby selecting a number to be called.
Claim 15
Dependent Claim
42 words
A keyboard network as set forth in claim 9 further including diode bridge means connected between said telephone line and said pulse generating means and memory means, thus rendering immaterial the direction in which said keyboard network is connected to said line.
References Cited (Backward Citations)
US2777945A
Cited
US3376391A
Cited
US3329775A
Cited
US3362014A
Cited
DE1193114B
Cited
US3409742A
Cited
DE1512037A1
Cited
US3457368A
Cited
US3434117A
Cited
US3601552A
Cited
US3543295A
Cited
US3579118A
Cited
US3629715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |