US3816731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion apparatus utilized with an electronic calculator
Assignee: Kerby & Moos
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Filing: 1973-02-20
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Granted: 1974-06-11
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Expires: 1993-02-20
Abstract
Abstract The apparatus of the present invention comprises a conversion circuit used in combination with a conventional electronic calculator for converting distance in units in one system to an equivalent distance in units in another system. Also, the conversion circuit converts the magnitude of an angle to the magnitude of its complementary angle. More specifically, the conversion circuit converts nautical miles to statute miles, statute miles to nautical miles, and the degrees of an angle to the degrees of its complementary angle. The conversion circuit supplies input signals to the arithmetic circuit of the calculator, which signals are equivalent to key input signals from the calculator''s input switch matrix. The number to be converted is first entered on the calculator''s keyboard and then an appropriate switch corresponding to the desired conversion is closed. The input signals to the arithmetic circuit of the calculator are generated by a logic circuit which is responsive to the closure of one of the conversion selection switches. A sequencer circuit controls the logic circuit to supply the desired signals corresponding to either an arithmetic function or a numeral in proper sequence to the calculator. An angle detector circuit determines the magnitude of the angle entered in degrees on the calculator''s keyboard. If it is less than 180*, the logic circuit effectively enters an addition function and then 180*. If it is 180* or more, the logic circuit effectively enters a subtraction function and then 180*. The conversion between statute miles and nautical miles is performed by either multiplying or dividing by a factor of 0.87. Each cycle is automatically terminated after the logic circuit enters a signal corresponding to an equal sign into the arithmetic circuit of the calculator.
Inventors
- 👤 R Jennings
- 👤 R Teets
- 👤 P Kerby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:13
CPC Classifications
H; H03; H03M; H03M7/00; G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/544; G06F7/548
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
229 words
Conversion apparatus including: A. a calculator comprising: a. a keyboard, b. an input circuit for generating signals corresponding to numerals to be operated on and functions to be performed as entered on the keyboard, c. an arithmetic circuit responsive to such signals for arithmetically operating on data represented thereby, said arithmetic circuit operating sequentially on each signal applied thereto for generating a busy signal, d. an output circuit responsive to an output of said arithmetic circuit including a display to provide an indication of the result of the arithmetic operation performed therein; and B. a conversion circuit in combination therewith, said conversion circuit comprising: a. first means for providing a signal corresponding to a conversion function to be performed, b. second means connected to said input circuit and said first means and said arithmetic circuit for entering a signal in said arithmetic circuit corresponding to a numeral to be operated on and entering into said arithmetic circuit a signal corresponding to a conversion function to be performed, c. third means connected to said second means and said arithmetic circuit for controlling the operation of said second means in response to said busy signals from said arithmetic circuit to sequentially enter into said arithmetic circuit through said second means a signal corresponding to a numeral to be operated on and a signal corresponding to the conversion function to be performed.
Claim 2
Dependent Claim
229 words
Conversion apparatus including: A. a calculator comprising: a. a keyboard, b. an input circuit for generating signals corresponding to numerals to be operated on and functions to be performed as entered on the keyboard, c. an arithmetic circuit responsive to such signals for arithmetically operating on data represented thereby, said arithmetic circuit operating sequentially on each signal applied thereto for generating a busy signal, d. an output circuit responsive to an output of said arithmetic circuit including a display to provide an indication of the result of the arithmetic operation performed therein; and B. a conversion circuit in combination therewith, said conversion circuit comprising: a. first means for providing a signal corresponding to a conversion function to be performed, b. second means connected to said input circuit and said first means and said arithmetic circuit for entering a signal in said arithmetic circuit corresponding to a numeral to be operated on and entering into said arithmetic circuit a signal corresponding to a conversion function to be performed, c. third means connected to said second means and said arithmetic circuit for controlling the operation of said second means in response to said busy signals from said arithmetic circuit to sequentially enter into said arithmetic circuit through said second means a signal corresponding to a numeral to be operated on and a signal corresponding to the conversion function to be performed.
Claim 3
Dependent Claim
77 words
Conversion apparatus as claimed in claim 1, wherein the input circuit of the calculator is an input switch matrix having a plurality of outputs each corresponding to either an arithmetic function to be performed or a numeral to be arithmetically operated on and connected to corresponding inputs of the arithmetic circuit, and wherein said second means of said conversion circuit is connected to said inputs of the arithmetic circuit and said outputs of said input switch matrix.
Claim 4
Dependent Claim
155 words
Conversion apparatus as claimed in claim 1, wherein the input circuit of the calculator comprises input switch matrix having a plurality of input lines which have potentials applied thereto in succession by the arithmetic circuit, a plurality of output lines connected to corresponding inputs of the arithmetic circuit, and a plurality of switches each corresponding to either an arithmetic function to be performed or a numeral to be arithmetically operated on and connected to a corresponding one of the input lines, such that the arithmetic circuit senses either a particular function or a particular numeral in accordance with the particular input line which has a potential applied thereto and the particular switch which is closed, and wherein said second means of said conversion circuit is responsive to the potential on a respective one of the input lines of the input circuit and to said third means for providing a corresponding input to said arithmetic circuit.
Claim 5
Dependent Claim
50 words
Conversion apparatus as claimed in claim 1 and further comprising means responsive to an output signal of the arithmetic circuit for entering into said second means a conversion function to be performed in accordance with the magnitude of a number entered into the input circuit by way of the keyboard.
Claim 6
Dependent Claim
176 words
Conversion apparatus including: A. a calculator comprising: a. a keyboard, b. an input circuit for generating signals corresponding to numerals to be operated on and functions to be performed as entered on the keyboard, c. an arithmetic circuit responsive to such signals for arithmetically operating on data represented thereby, d. an output circuit responsive to an output of said arithmetic circuit including a display to provide an indication of the result of the arithmetic operation performed therein; and B. a conversion circuit in combination therewith, said conversion circuit comprising: a. first means responsive to an output signal of the arithmetic circuit for providing a conversion function to be performed in accordance with the magnitude of a number entered into the input circuit by way of the keyboard, and b. second means connected to said input circuit and said first means and said arithmetic circuit for entering a signal in said arithmetic circuit corresponding to a numeral to be operated on and entering into said arithmetic circuit a signal corresponding to the conversion function to be performed.
Claim 7
Dependent Claim
176 words
Conversion apparatus including: A. a calculator comprising: a. a keyboard, b. an input circuit for generating signals corresponding to numerals to be operated on and functions to be performed as entered on the keyboard, c. an arithmetic circuit responsive to such signals for arithmetically operating on data represented thereby, d. an output circuit responsive to an output of said arithmetic circuit including a display to provide an indication of the result of the arithmetic operation performed therein; and B. a conversion circuit in combination therewith, said conversion circuit comprising: a. first means responsive to an output signal of the arithmetic circuit for providing a conversion function to be performed in accordance with the magnitude of a number entered into the input circuit by way of the keyboard, and b. second means connected to said input circuit and said first means and said arithmetic circuit for entering a signal in said arithmetic circuit corresponding to a numeral to be operated on and entering into said arithmetic circuit a signal corresponding to the conversion function to be performed.
Claim 8
Dependent Claim
61 words
Conversion apparatus as claimed in claim 5 and further comprising third means in said conversion circuit connected to said second means for controlling the operation of said second means for sequentially advancing to said arithmetic circuit through said second means a signal corresponding to a numeral to be operated on and a signal corresponding to the conversion function to be performed.
Claim 9
Dependent Claim
84 words
Conversion apparatus as claimed in claim 6 wherein said arithmetic circuit operates sequentially on each signal applied thereto for generating a busy signal and wherein said third means being connected to said arithmetic circuit for controlling the operation of said second means in response to said busy signals from said arithmetic circuit to sequentially enter to said arithmetic circuit through said second means a signal corresponding to a numeral to be operated on and a signal corresponding to the conversion function to be performed.
References Cited (Backward Citations)
US3654449A
Cited
US3715746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |