Patent US3790708A successfully refreshed from Google Patents.
US3790708A
Expired / Lapsed
US
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Communication method and apparatus
Assignee: Telectrotype Corp America
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Filing: 1972-10-12
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Granted: 1974-02-05
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Expires: 1992-10-12
Abstract
Abstract The present disclosure is directed to a communication system employing two typewriters of the electromechanical type each of which is equipped to be both a transmitter and receiver for twoway communication. When employed as a transmitter the first typewriter, upon depression of each keyboard device, initiates an electrical pulse which is passed through an encoding matrix which is responsive and definitive of only one keyboard character and which through a recycling chain counter places the representative pulse, having its identity discernable by its polarity, current or frequency level, on the conductive link between the first and second typewriter. At the second typewriter the incoming signal is received through an electrically selective matrix of switching devices which decode the incoming signal by polarity, current level or frequency. The pulse format is then directed to a second matrix where electrical means responsive to the individual coded characters activate the print out mechanism of the second typewriter to print the message.
Inventors
- 👤 V Bugg
- 👤 F Bugg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:48
CPC Classifications
H; H04; H04L; H04L17/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
160 words
A communication system comprising a transmitting typewriter of the electromechanical type and a receiving typewriter of the electromechanical type, conductive link means interconnecting said transmitting and receiving typewriters, means responsive to the depression of each key on the keyboard of the transmitting typewriter to initiate an electrical impulse; a switching matrix in circuit with each of said transmitting and receiving typewriters and having a plurality of units, each being responsive to only one character initiated by the keyboard of tHe transmitting typewriter and received by the receiving typewriter, means in said matrix, selectively in circuit with said electrically conductive means between said transmitting and receiving typewriters, for impressing upon and decoding from the conductive line the appropriate polarity, current or frequency level of a pulse format representative of the character selected to be transmitted by the transmitting typewriter and received by the receiving typewriter to cause print out of a message at the receiving typewriter transmitted from the transmitting typewriter.
Claim 2
Dependent Claim
160 words
A communication system comprising a transmitting typewriter of the electromechanical type and a receiving typewriter of the electromechanical type, conductive link means interconnecting said transmitting and receiving typewriters, means responsive to the depression of each key on the keyboard of the transmitting typewriter to initiate an electrical impulse; a switching matrix in circuit with each of said transmitting and receiving typewriters and having a plurality of units, each being responsive to only one character initiated by the keyboard of tHe transmitting typewriter and received by the receiving typewriter, means in said matrix, selectively in circuit with said electrically conductive means between said transmitting and receiving typewriters, for impressing upon and decoding from the conductive line the appropriate polarity, current or frequency level of a pulse format representative of the character selected to be transmitted by the transmitting typewriter and received by the receiving typewriter to cause print out of a message at the receiving typewriter transmitted from the transmitting typewriter.
Claim 3
Dependent Claim
68 words
A communication system as claimed in claim 1, wherein the pulse format, being received by the receiving typewriter, is passed through a discriminator matrix where the pulse is graded as to polarity, current or frequency level and thence directed to said switching matrix where electrical means, responsive to the individual characters, actuate the receiving typewriter''s print out mechanism to print out the message transmitted from the transmitting typewriter.
Claim 4
Dependent Claim
37 words
A communication system as claimed in claim 2 wherein said pulse format of said transmitting typewriter leaving said switching matrix, is subjected to a re-cycling chain counter prior to being placed in circuit with the receiving typewriter.
Claim 5
Dependent Claim
19 words
A communication system as claimed in claim 3 wherein said re-cycling chain counter has a return to zero function.
Claim 6
Independent Claim
123 words
The method of communicating in a communication system having a transmitting and receiving electromechanical typewriter in which encoded intelligence is transmitted by the transmitting typewriter and received and decoded and printed by the receiving typewriter over a conductor linking same; comprising, generating an electrical impulse upon selection of characters on the transmitting typewriter said impulse having a discreet polarity, current or frequency level representative of only the selected character, impressing said impulse on the conductor linking said transmitting typewriter to said receiving typewriter, receiving the transmitted pulse at the receiving typewriter and decoding by screening and grading the pulse as to polarity, current or frequency and pulse format, and activating the receiving typewriter to print out the decoded message at the receiving typewriter.
Claim 7
Independent Claim
123 words
The method of communicating in a communication system having a transmitting and receiving electromechanical typewriter in which encoded intelligence is transmitted by the transmitting typewriter and received and decoded and printed by the receiving typewriter over a conductor linking same; comprising, generating an electrical impulse upon selection of characters on the transmitting typewriter said impulse having a discreet polarity, current or frequency level representative of only the selected character, impressing said impulse on the conductor linking said transmitting typewriter to said receiving typewriter, receiving the transmitted pulse at the receiving typewriter and decoding by screening and grading the pulse as to polarity, current or frequency and pulse format, and activating the receiving typewriter to print out the decoded message at the receiving typewriter.
References Cited (Backward Citations)
US1562457A
Cited
US2113611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |