US3812489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display device for use in a desk top calculator
Assignee: Canon Inc
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Filing: 1972-09-11
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Granted: 1974-05-21
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Expires: 1992-09-11
Abstract
Abstract A desk top calculator includes a display device which displays the numerical information. This display device consumes considerable power. In order to minimize the power consumption by the display device, display of the numerical information is ceased with the lapse of a predetermined period after once the numerical information is displayed. Instead, a pattern or patterns other than the numerical information is displayed on the display device to indicate that the numerical information is held in the register without displaying.
Inventors
- 👤 R Hirano
- 👤 M Ito
- 👤 J Ishiwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:14
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/14; G06F3/1407; G06F15/00; G06F15/02; G09; G09G; G09G3/00; G09G3/04; G09G3/06; G09G3/12; G09G3/14
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
93 words
A display device for use in a desk top calculator including a. display means capable of displaying the numerical information and other patterns in a plurality of digits; b. power supply means for supplying the power to only said display means; c. switching means comprising a plurality of switching elements through which said power supply means is connected to said display means; d. means for generating a specified signal which indicates to minimize the power consumption; and e. means for interrupting the operation of said switching means in response to said specified signal.
Claim 2
Dependent Claim
93 words
A display device for use in a desk top calculator including a. display means capable of displaying the numerical information and other patterns in a plurality of digits; b. power supply means for supplying the power to only said display means; c. switching means comprising a plurality of switching elements through which said power supply means is connected to said display means; d. means for generating a specified signal which indicates to minimize the power consumption; and e. means for interrupting the operation of said switching means in response to said specified signal.
Claim 3
Dependent Claim
41 words
A display device as defined in claim 1 further including means for causing some specified switching elements of said switching means to close for displaying at least one specified pattern other than the numerical information in response to said specified signal.
Claim 4
Dependent Claim
106 words
A display device for use in a desk top calculator including a. display means capable of displaying the numerical information and other patterns in a plurality of digits; b. power supply means for supplying means for supplying the power to only said display means; c. switching means comprising a plurality of switching elements through which said power supply means is connected to said display means; d. means for measuring a predetermined time after a key signal is applied and giving an output signal; and e. means for interrupting the operation of said switching means in response to said output signal from said predetermined time measuring means.
Claim 5
Dependent Claim
106 words
A display device for use in a desk top calculator including a. display means capable of displaying the numerical information and other patterns in a plurality of digits; b. power supply means for supplying means for supplying the power to only said display means; c. switching means comprising a plurality of switching elements through which said power supply means is connected to said display means; d. means for measuring a predetermined time after a key signal is applied and giving an output signal; and e. means for interrupting the operation of said switching means in response to said output signal from said predetermined time measuring means.
Claim 6
Dependent Claim
47 words
A display device as defined in claim 3 further including means for causing some specified switching elements of said switching means to close for displaying at least one specified pattern other than the numerical information in response to said output signal from said predetermined time measuring means.
Claim 7
Dependent Claim
30 words
A display device as defined in claim 4 further including means for selecting at least one specified digit, whereby to display at least one specified pattern in said specified digit.
Claim 8
Dependent Claim
25 words
A display device as defIned in claim 4 further including means for selecting a least significant digit, whereby to display pattern ''''H'''' in said digit.
Claim 9
Dependent Claim
34 words
A display device as defined in claim 4 further including means for selecting at least one digit in which numerical information was displayed whereby to display at least one specified pattern in said digit.
Claim 10
Dependent Claim
34 words
A display device as defined in claim 4 further including means for selecting at least one digit in which numerical information was displayed, whereby to display at least one decimal point in said digit.
Claim 11
Dependent Claim
107 words
A display device for use in a desk top calculator including a. display means capable of displaying the numerical information and other specified patterns in a plurality of digits; b. power supply means for supplying the power to only said display means; c. switching means comprising a plurality of switching elements through which said power supply means is connected to said display means; d. means for detecting the overflow of a register for holding the numerical information to be displayed and giving an output signal; and e. means for interrupting the operation of said switching means in response to said output signal from said overflow detecting means.
Claim 12
Dependent Claim
107 words
A display device for use in a desk top calculator including a. display means capable of displaying the numerical information and other specified patterns in a plurality of digits; b. power supply means for supplying the power to only said display means; c. switching means comprising a plurality of switching elements through which said power supply means is connected to said display means; d. means for detecting the overflow of a register for holding the numerical information to be displayed and giving an output signal; and e. means for interrupting the operation of said switching means in response to said output signal from said overflow detecting means.
Claim 13
Dependent Claim
46 words
A display device as defined in claim 9 further including means for causing some specified switching elements of said switching means to close for displaying at least one specified pattern other than the numerical information in response to said output signal from said overflow detecting means.
Claim 14
Dependent Claim
30 words
A display device as defined in claim 10 further including means for selecting at least one specified digit, whereby to display at least one specified pattern in said specified digit.
Claim 15
Dependent Claim
25 words
A display device as defined in claim 10 further including means for selecting a most significant digit, whereby to display pattern ''''F'''' in said digit.
Claim 16
Dependent Claim
122 words
A display device for use in a desk top calculator including a. display means capable of displaying the numerical information and other specified patterns in a plurality of digits; b. power supply means for supplying the power to only said display means; c. switching means comprising a plurality of switching elements through which said power supply means is connected to said display means; d. means for measuring a predetermined time after a key signal is applied and giving an measuring output signal; e. means for detecting the overflow of a register for holding the numerical information to be displayed and giving an detecting output signal; and f. means for interrupting the operation of said switching means in response in said output signals.
Claim 17
Dependent Claim
122 words
A display device for use in a desk top calculator including a. display means capable of displaying the numerical information and other specified patterns in a plurality of digits; b. power supply means for supplying the power to only said display means; c. switching means comprising a plurality of switching elements through which said power supply means is connected to said display means; d. means for measuring a predetermined time after a key signal is applied and giving an measuring output signal; e. means for detecting the overflow of a register for holding the numerical information to be displayed and giving an detecting output signal; and f. means for interrupting the operation of said switching means in response in said output signals.
Claim 18
Dependent Claim
39 words
A display device as defined in claim 13 further including means for causing some specified switching elements of said switching means to close for displaying specified patterns other than the numerical information respectively in response to said output signals.
Claim 19
Dependent Claim
31 words
A display device as defined in claim 14 further including means for selecting different digits, whereby to display said patterns in said different digits respectively in response to said output signals.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |