US3586148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard apparatus switchable between teletype and typewriter operation
Assignee: Computer Transceiver Systems Inc
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Filing: 1968-08-06
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Granted: 1971-06-22
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Expires: 1988-08-06
Abstract
Abstract A keyboard includes a plurality of key-operated graphic indicia (characters, symbols, numerics, etc.) switches, a Qwerty shift lock switch and a case shift switch. Normally, the keyboard transmits coded combinations of signals representing lower case characters unless the case shift switch is operated. In the ''''Qwerty'''' position, i.e. when the shift lock switch is thrown, the keyboard normally transmits upper case characters unless the case shift switch is operated. In either event, certain symbols are transmitted according to the normal operation, i.e. the ''''Qwerty'''' shift switch does not effect the normal transmission of symbols. A Qwerty field on a keyboard is that row of keys associated with the characters Q, W, E, R, T, Y, U, I, O, P. On conventional office typewriters and some Teletypewriters it is the second row of keys.
Inventors
- 👤 Allen G Jacobson
- 👤 Theodore Schieber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:14
CPC Classifications
H; H03; H03M; H03M11/00; H03M11/22; B; B41; B41J; B41J5/00; B41J5/08; H03M11/02; H03M11/04; H03M11/14; H03M11/18; H04; H04L; H04L17/00; H04L17/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
270 words
A keyboard apparatus for generatinG coded combinations of signals representing a set of graphic indicia including at least upper case alphabetic characters, lower case alphabetic characters and a plurality of symbols, each graphic indicium being represented by a unique binary coded combination of signals T1, T2, T3, T4, T5, T6 and T7, said apparatus comprising: a keyoperable signal encoding means including a plurality of graphic indicia switches each associated with a pair of indicia wherein each one of the switches of a first group of said switches is associated with the upper and lower case representations of the same one of the alphabetic characters, respectively, and each one of the switches of a second group of said switches is associated with two different symbols, each one of said switches when operated generating a different binary coded combination of signals B1, B2, B3, B4, B5, B6 and B7, each having a particular positional significance; a user-operable shift lock switch for generating a control signal QS for indicating which graphic indicium of a pair of graphic indicia is to be represented as a binary coded combination of signals; a key-operable case shift switch for generating a control signal SH for indicating a case shift; and a signal processing means connected to said keyoperable signal encoding means, said user-operable shift lock switch and said key-operable case shift switch for receiving signals therefrom and generating binary coded combinations of signals T1, T2, T3, T4, T5, T6 and T7, each having a particular positional significance, said signal processing means including logical elements for processing the received signals in accordance with the following Boolean logic equations:
Claim 2
Dependent Claim
270 words
A keyboard apparatus for generatinG coded combinations of signals representing a set of graphic indicia including at least upper case alphabetic characters, lower case alphabetic characters and a plurality of symbols, each graphic indicium being represented by a unique binary coded combination of signals T1, T2, T3, T4, T5, T6 and T7, said apparatus comprising: a keyoperable signal encoding means including a plurality of graphic indicia switches each associated with a pair of indicia wherein each one of the switches of a first group of said switches is associated with the upper and lower case representations of the same one of the alphabetic characters, respectively, and each one of the switches of a second group of said switches is associated with two different symbols, each one of said switches when operated generating a different binary coded combination of signals B1, B2, B3, B4, B5, B6 and B7, each having a particular positional significance; a user-operable shift lock switch for generating a control signal QS for indicating which graphic indicium of a pair of graphic indicia is to be represented as a binary coded combination of signals; a key-operable case shift switch for generating a control signal SH for indicating a case shift; and a signal processing means connected to said keyoperable signal encoding means, said user-operable shift lock switch and said key-operable case shift switch for receiving signals therefrom and generating binary coded combinations of signals T1, T2, T3, T4, T5, T6 and T7, each having a particular positional significance, said signal processing means including logical elements for processing the received signals in accordance with the following Boolean logic equations:
Claim 3
Dependent Claim
265 words
A keyboard apparatus for generating coded combinations of signals representing a set of graphic indicia including at least upper case alphabetic characters, lower case alphabetic characters and a plurality of symbols, each graphic indicium being represented by a unique binary coded combination of signals T1, T2, T3, T4, T5, T6, T7 and T8, each having a particular positional significance, said apparatus comprising: a plurality of key-operable graphic indicia switches each associated with a pair of indicia wherein each one of the switches of a first group of said switches is associated with the upper and lower case representations of the same one of the alphabetic characters, respectively, and each one of the switches of a second group of said switches is associated with two different symbols, each one of said switches generating a different indicium signal when operated; an encoding matrix receiving the indicium signals generated by said graphic indicia switches for generating a unique binary coded combination of signals B1, B2, B3, B4, B5, B6, B7 and B8, each having a particular positional significance, in accordance with the indicia signal received; a user-operable Qwerty shift lock switch for generating a control signal QS for indicating which graphic indicium of a pair of graphic indicia is to be represented as a binary-coded combination of signals; a logic network means connected to said encoding matrix and said user-operable Qwerty shift lock switch and including logical elements for processing received signals and generating signals P1, P2, P3, P4, P5, P6, P7 and P8, each having a particular positional significance, in accordance with the following Boolean logic equations:
Claim 4
Dependent Claim
265 words
A keyboard apparatus for generating coded combinations of signals representing a set of graphic indicia including at least upper case alphabetic characters, lower case alphabetic characters and a plurality of symbols, each graphic indicium being represented by a unique binary coded combination of signals T1, T2, T3, T4, T5, T6, T7 and T8, each having a particular positional significance, said apparatus comprising: a plurality of key-operable graphic indicia switches each associated with a pair of indicia wherein each one of the switches of a first group of said switches is associated with the upper and lower case representations of the same one of the alphabetic characters, respectively, and each one of the switches of a second group of said switches is associated with two different symbols, each one of said switches generating a different indicium signal when operated; an encoding matrix receiving the indicium signals generated by said graphic indicia switches for generating a unique binary coded combination of signals B1, B2, B3, B4, B5, B6, B7 and B8, each having a particular positional significance, in accordance with the indicia signal received; a user-operable Qwerty shift lock switch for generating a control signal QS for indicating which graphic indicium of a pair of graphic indicia is to be represented as a binary-coded combination of signals; a logic network means connected to said encoding matrix and said user-operable Qwerty shift lock switch and including logical elements for processing received signals and generating signals P1, P2, P3, P4, P5, P6, P7 and P8, each having a particular positional significance, in accordance with the following Boolean logic equations:
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |