US4001569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
General purpose calculator having selective data storage, data conversion and time-keeping capabilities
Assignee: HP Inc
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Filing: 1975-04-08
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Granted: 1977-01-04
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Expires: 1995-04-08
Abstract
Abstract A battery powered hand-held calculator is disclosed which includes a built-in metric to U.S. conversion function for converting units from one system to the other; a degrees-minutes-seconds conversion function for converting angles or units of time from degrees-minutes-seconds to the decimal system and conversely.
Inventors
- 👤 Peter D. Dickinson
- 👤 Thomas E. Osborne
- 👤 France Rode
- 👤 Allen J. Baum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:23
CPC Classifications
G; G06; G06F; G06F15/00; G06F15/02; G06F15/025; G06F15/0258; G06F15/0225
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
301 words
An electronic calculator comprising: an input unit including a plurality of manually operable non-numeric and numeric keys for entering information and numbers into the calculator; a first memory unit coupled to the input unit and including a first storage register for storing a first number in units of decimal degrees having an integer portion and a decimal portion received therefrom, said integer portion referring to all digits to the left of the decimal in conventional decimal notation and said decimal portion referring to all digits to the right of the decimal in conventional decimal notation; a processing unit coupled to the input unit and the first memory unit and including means for converting the first number to a second number having first, second, and third parts representing said first number in units of degrees, minutes, and seconds respectively by multiplying the decimal portion of the first number by a preselected factor to provide a first result having an integer portion and a decimal portion and for multiplying the decimal portion of the first result by said preselected factor to provide a second result having an integer portion and a decimal portion; and an output display unit coupled to the processing unit for providing a visual display of the second number; said first part of the second number being the integer portion of the first number and appearing to the left of the decimal in said visual display; said second part of the second number being the integer portion of the first result and appearing in said visual display as the first two digits to the right of the decimal; said third part of the second number being the integer portion of the second result and appearing in said visual display as the second two digits to the right of the decimal.
Claim 2
Dependent Claim
301 words
An electronic calculator comprising: an input unit including a plurality of manually operable non-numeric and numeric keys for entering information and numbers into the calculator; a first memory unit coupled to the input unit and including a first storage register for storing a first number in units of decimal degrees having an integer portion and a decimal portion received therefrom, said integer portion referring to all digits to the left of the decimal in conventional decimal notation and said decimal portion referring to all digits to the right of the decimal in conventional decimal notation; a processing unit coupled to the input unit and the first memory unit and including means for converting the first number to a second number having first, second, and third parts representing said first number in units of degrees, minutes, and seconds respectively by multiplying the decimal portion of the first number by a preselected factor to provide a first result having an integer portion and a decimal portion and for multiplying the decimal portion of the first result by said preselected factor to provide a second result having an integer portion and a decimal portion; and an output display unit coupled to the processing unit for providing a visual display of the second number; said first part of the second number being the integer portion of the first number and appearing to the left of the decimal in said visual display; said second part of the second number being the integer portion of the first result and appearing in said visual display as the first two digits to the right of the decimal; said third part of the second number being the integer portion of the second result and appearing in said visual display as the second two digits to the right of the decimal.
Claim 3
Dependent Claim
14 words
An electronic calculator as in claim 1 wherein the preselected is the number 60.
Claim 4
Dependent Claim
193 words
An electronic calculator as in claim 1 wherein: said first number has first, second, and third parts representing units of degrees, minutes, and second, respectively; said second number has an integer portion and a decimal portion representing units of decimal degrees; and said means are effective for converting the first number to the second number by dividing the second part of the first number by the preselected factor to provide the first result and for dividing the third part of the first number by the preselected factor to provide the second result; said integer portion of the second number being the first part of the first number and appearing to the left of the decimal in said visual display; said first two digits of the decimal portion of the second number being the integer portion of the first result and appearing in said visual display as the first two digits to the right of the decimal; said second two digits of the decimal portion of the second number being the integer portion of the second result and appearing in said visual display as the second two digits to the right of the decimal.
Claim 5
Dependent Claim
15 words
An electronic calculator as in claim 3 wherein the preselected factor is the number 60.
Claim 6
Dependent Claim
91 words
An electronic calculator as in claim 3 for converting a first number in units of inches to a second number in units of centimeters wherein: first memory unit further includes a second storage register for storing a first preselected conversion factor; and the processing unit includes means responsive to actuation of one or more of the keys of the input unit for automatically multiplying the first number by said first preselected conversion factor to obtain the second number, and for causing the output display unit to provide a visual display thereof.
Claim 7
Dependent Claim
14 words
An electronic calculator as in claim 5 wherein the first preselected factor is 2.540000000.
Claim 8
Dependent Claim
92 words
An electronic calculator as in claim 3 for converting a first number in units of gallons to a second number in units of liters wherein: the first memory unit further includes a second storage register for storing a second preselected conversion factor; and the processing unit includes means reponsive to actuation of one or more of the keys of the input unit for automatically multiplying the first number by said second preselected conversion factor to obtain the second number, and for causing the output display unit to provide a visual display thereof.
Claim 9
Dependent Claim
14 words
An electronic claculator as in claim 7 wherein the second preselected factor is 0.453592370.
Claim 10
Dependent Claim
92 words
An electronic calculator as in claim 3 for converting a first number in units of pounds to a second number in units of centimeters wherein: the first memory unit further includes a second storage register for storing a third preselected conversion factor; and the processing unit includes means responsive to actuation of one or more of the keys of the input unit for automatically multiplying the first number by said third preselected conversion factor to obtain the second number, and for causing the output display unit to provide a visual display thereof.
Claim 11
Dependent Claim
14 words
An electronic calculator as in claim 9 wherein the third preselected factor is 3.785411784.
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) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |