US4686643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic equipment selectively storing a frequently used conversion function
Assignee: Canon Inc
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Filing: 1985-07-01
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Granted: 1987-08-11
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Expires: 2005-07-01
Abstract
Abstract An electronic desk-top calculator with a unit conversion function comprises an input key for inputting a type of unit conversion, an execution unit for executing unit conversion, a first memory for storing a conversion rate for the unit conversion and a second memory for storing the type of unit conversion. The execution unit carries out the unit conversion based on the conversion rate stored in the first memory and the type of unit conversion stored in the second memory.
Inventors
- 👤 Junichi Ishiwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:00
CPC Classifications
G; G06; G06F; G06F15/00; G06F15/02; G06F15/025; G06F15/0258
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
168 words
Electronic equipment with a unit conversion function, comprising: input means having key means for selectively inputting a type of unit conversion and numerical information; first memory means for storing a conversion rate for the type of unit conversion input by said input means; second memory means for storing a type of unit conversion input by said input means; conversion memory set means for loading the type of unit conversion input by said input means in said second memory means; and instruction means, responsive to actuation of said key means and in cooperation with said first and second memory means, for repeatedly executing the type of unit conversion stored in said second memory means on numerical information repeatedly input by said input means on the basis of the conversion rate stored in said first memory means when said conversion memory set means has stored a type of unit conversion in said second memory means from a previously executed conversion and the conversion rate stored in said first memory means.
Claim 2
Dependent Claim
168 words
Electronic equipment with a unit conversion function, comprising: input means having key means for selectively inputting a type of unit conversion and numerical information; first memory means for storing a conversion rate for the type of unit conversion input by said input means; second memory means for storing a type of unit conversion input by said input means; conversion memory set means for loading the type of unit conversion input by said input means in said second memory means; and instruction means, responsive to actuation of said key means and in cooperation with said first and second memory means, for repeatedly executing the type of unit conversion stored in said second memory means on numerical information repeatedly input by said input means on the basis of the conversion rate stored in said first memory means when said conversion memory set means has stored a type of unit conversion in said second memory means from a previously executed conversion and the conversion rate stored in said first memory means.
Claim 3
Dependent Claim
27 words
Electronic equipment with a unit conversion function according to claim 1 further comprising means for clearing the type of unit conversion stored in said second memory means.
Claim 4
Dependent Claim
33 words
Electronic equipment with a unit conversion function according to claim 1 further including means for replacing the type of unit conversion stored in said second memory means with another type of unit converion.
Claim 5
Dependent Claim
30 words
Electronic equipment with a unit conversion function according to claim 1 further comprising indication means for indicating when a type of unit conversion is stored in said second memory means.
Claim 6
Dependent Claim
28 words
Electronic equipment with a unit conversion function according to claim 1 wherein said second memory means includes a memory for storing information representing different types of unit conversion.
Claim 7
Dependent Claim
109 words
Electronic equipment with a unit conversion function, comprising: first memory means for storing various conversion rates for unit conversion; input means having key means for specifying a direction of unit conversion and means for inputting numerical information; second memory means for storing a type of unit conversion; and means responsive to actuation of said key means for executing unit conversion of numerical information input by said means for inputting by referring to the direction of unit conversion specified by said key means, the type of unit conversion stored in said second memory means from a previously executed unit conversion and a conversion rate stored in said first memory means.
Claim 8
Dependent Claim
109 words
Electronic equipment with a unit conversion function, comprising: first memory means for storing various conversion rates for unit conversion; input means having key means for specifying a direction of unit conversion and means for inputting numerical information; second memory means for storing a type of unit conversion; and means responsive to actuation of said key means for executing unit conversion of numerical information input by said means for inputting by referring to the direction of unit conversion specified by said key means, the type of unit conversion stored in said second memory means from a previously executed unit conversion and a conversion rate stored in said first memory means.
Claim 9
Dependent Claim
20 words
Electronic equipment with a unit conversion function according to claim 6 wherein said second memory means is a readable/writable memory.
Claim 10
Dependent Claim
170 words
Electronic equipment with a unit conversion function, comprising: input means having key means for selectively inputting a type of unit conversion and numerical information; first memory means for storing a conversion rate for the type of unit conversion input by said input means, wherein said first memory means is a read-only memory; second memory means for storing a type of unit conversion input by said input means, wherein said second memory means is a readable/writable memory; conversion memory set means for loading the type of unit conversion input by said input means in said second memory means; and instruction means, responsive to actuation of said key means and in cooperation with said first and second memory means, for repeatedly executing the type of unit conversion stored in said second memory means on numerical information repeatedly input by said input means on the basis of the conversion rate stored in said first memory means when said conversion memory set means has stored a type of unit conversion in said memory means.
Claim 11
Dependent Claim
170 words
Electronic equipment with a unit conversion function, comprising: input means having key means for selectively inputting a type of unit conversion and numerical information; first memory means for storing a conversion rate for the type of unit conversion input by said input means, wherein said first memory means is a read-only memory; second memory means for storing a type of unit conversion input by said input means, wherein said second memory means is a readable/writable memory; conversion memory set means for loading the type of unit conversion input by said input means in said second memory means; and instruction means, responsive to actuation of said key means and in cooperation with said first and second memory means, for repeatedly executing the type of unit conversion stored in said second memory means on numerical information repeatedly input by said input means on the basis of the conversion rate stored in said first memory means when said conversion memory set means has stored a type of unit conversion in said memory means.
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) | 1990-08-10 | 1991-02-09 | 1991-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-10 | 1995-02-09 | 1995-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-10 | 1999-02-09 | 1999-08-11 | $7700.00 | Window Closed / Lapsed |