US3597600A
Expired / Lapsed
US
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Electronic desk top calculator having a dual function keyboard logic means
Assignee: Singer Co
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Filing: 1969-05-05
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Granted: 1971-08-03
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Expires: 1989-05-05
Abstract
Abstract An electronic desk top calculator is disclosed which has a plurality of digit keys for entering numeric data into a storage portion and a plurality of function keys for specifying data handling operations to be performed on entered numeric data. One of the function keys is coupled to a dual function logic circuit which is controlled by a single key. When this single key is actuated after the actuation of one or more digit keys, the circuit acts as an entry circuit and produces a signal which indicates that entry of a number is complete. When this single key is actuated after the actuation of a function key, including itself, the circuit acts as a change sign circuit and produces a signal for incrementing the sign bit of the number in an entry register.
Inventors
- 👤 Carl E Herendeen
- 👤 Robert A Ragen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:21
CPC Classifications
H; H03; H03M; H03M11/00; H03M11/02; H03M11/04; H03M11/14; H03M11/16; G; G06; G06F; G06F15/00; G06F15/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
171 words
In an electronic desk top calculator having a keyboard means for generating numeric data including a sign bit specifying the algebraic sign of said data and function signals denoting operations to be performed on said numeric data, storage means for storing said numeric data, and processing means coupled to said keyboard means and said storage means for performing data handling operations on said data, said processing means including entry means for placing keyboard generated numeric data into said storage means and arithmetic and control means for performing operations on said numeric data in accordance with said function signals, the improvement wherein said keyboard means includes manually actuatable dual function logic means having a single key for generating an entry complete function signal indicating completion of the entry of a number when actuated after entry of at least one digit into said storage means and for generating an increment sign bit function signal for incrementing the value of said sign bit when actuated after the generation of any of said function signals.
Claim 2
Dependent Claim
171 words
In an electronic desk top calculator having a keyboard means for generating numeric data including a sign bit specifying the algebraic sign of said data and function signals denoting operations to be performed on said numeric data, storage means for storing said numeric data, and processing means coupled to said keyboard means and said storage means for performing data handling operations on said data, said processing means including entry means for placing keyboard generated numeric data into said storage means and arithmetic and control means for performing operations on said numeric data in accordance with said function signals, the improvement wherein said keyboard means includes manually actuatable dual function logic means having a single key for generating an entry complete function signal indicating completion of the entry of a number when actuated after entry of at least one digit into said storage means and for generating an increment sign bit function signal for incrementing the value of said sign bit when actuated after the generation of any of said function signals.
Claim 3
Dependent Claim
98 words
The apparatus of claim 1 wherein said dual function logic means includes a first bistable device coupled to said single key for producing a first output signal in response to the actuation of said single key, a second bistable device for producing a second output signal in response to the generation of any of said function signals and an AND gate coupled to said single key, said first bistable device, and said second bistable device for producing said sign bit incrementing signal in response to the actuation of said single key and the concurrence of said output signals.
Claim 4
Dependent Claim
53 words
The apparatus of claim 1 wherein said keyboard means includes a plurality of digit keys for specifying individual digits of said numeric data and said entry means comprises means for placing the corresponding representation of a specified digit into said storage means before the next succeeding digit is specified by said keyboard means.
Claim 5
Dependent Claim
34 words
The apparatus of claim 1 wherein said storage means comprises a memory device arranged in a plurality of registers including an entry register with each said register having a corresponding algebraic sign bit location.
Claim 6
Dependent Claim
14 words
The apparatus of claim 4 wherein said memory device comprises an acoustic delay line.
Claim 7
Dependent Claim
25 words
The apparatus of claim 4 wherein said entry means includes means for serially accessing said memory device to enter said numeric data in interlaced fashion.
Claim 8
Dependent Claim
33 words
The apparatus of claim 4 wherein said dual function logic means includes means for incrementing only the said sign bit in said entry register when actuated after a function signal has been generated.
Claim 9
Dependent Claim
117 words
A keyboard device for use in an electronic desk top calculator comprising a plurality of digit keys, a plurality of function keys, and a manually actuatable dual function logic circuit coupled to said keys, said circuit including a single key, means responsive to the actuatIon of said single key after the action of at least one of said digit keys for generating an entry complete signal for indicating completion of the entry of a number into said calculator, and means responsive to the actuation of said single key after the actuation of any one of said function keys for generating an increment sign bit signal for incrementing the value of the sign bit associated with said number.
Claim 10
Dependent Claim
117 words
A keyboard device for use in an electronic desk top calculator comprising a plurality of digit keys, a plurality of function keys, and a manually actuatable dual function logic circuit coupled to said keys, said circuit including a single key, means responsive to the actuatIon of said single key after the action of at least one of said digit keys for generating an entry complete signal for indicating completion of the entry of a number into said calculator, and means responsive to the actuation of said single key after the actuation of any one of said function keys for generating an increment sign bit signal for incrementing the value of the sign bit associated with said number.
Claim 11
Dependent Claim
105 words
The apparatus of claim 8 wherein said single key is adapted to generate a first output signal and wherein said dual function logic circuit further includes a first bistable device coupled to said single key for producing a second output signal in response to the actuation of said single key, a second bistable device for producing a third output signal in response to the actuation of one of said function keys, and an AND gate coupled to said single key, said first bistable device, and said second bistable device for producing a sign bit incrementing signal in response to the concurrence of said output signals.
Claim 12
Dependent Claim
68 words
The apparatus of claim 9 wherein said dual function logic circuit further includes a third bistable device coupled to said digit keys for producing a fourth output signal in response to the actuation of one of said digit keys, the output of said third bistable device being coupled to said second bistable device to prevent the occurrence of said third output signal after said fourth output signal occurs.
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |