US4470037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Input device for electronic apparatus
Assignee: Canon Inc
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Filing: 1981-09-22
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Granted: 1984-09-04
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Expires: 2001-09-22
Abstract
Abstract An input device for electronic apparatus includes key signal output lines each having plural key switches connected thereto and circuitry for identifying the same key signal under the control of plural keys.
Inventors
- 👤 Hiroshi Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:08
CPC Classifications
H; H03; H03M; H03M11/00; H03M11/02; H03M11/04; H03M11/14; H03M11/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
An input device for an electronic apparatus, comprising: a plurality of input keys; a first key signal line to which said input keys are connected; a plurality of first AND gate means each having at least two inputs, one said input being connected to said first key signal line, each of said first AND gates also having an output for providing an instruction signal; and setting means for selecting one of said first AND gate means, said setting means including memory means, connected to another input of each of said first AND gate means for producing output signals for selectively enabling any of said first AND gate means, said setting means further including a plurality of switches connected to said memory means for selecting the output signals to be produced by said memory means.
Claim 2
Dependent Claim
134 words
An input device for an electronic apparatus, comprising: a plurality of input keys; a first key signal line to which said input keys are connected; a plurality of first AND gate means each having at least two inputs, one said input being connected to said first key signal line, each of said first AND gates also having an output for providing an instruction signal; and setting means for selecting one of said first AND gate means, said setting means including memory means, connected to another input of each of said first AND gate means for producing output signals for selectively enabling any of said first AND gate means, said setting means further including a plurality of switches connected to said memory means for selecting the output signals to be produced by said memory means.
Claim 3
Dependent Claim
95 words
An input device for an electronic apparatus according to claim 1, wherein said memory means has input means and wherein said setting means further includes a plurality of second AND gate means for changing the output signals produced by said memory means, each of said second AND gate means having at least one input and an output connected to said input means of said memory means, and wherein said setting means also includes a second key signal line connected between each of said switches and an input of each of said second AND gate means.
Claim 4
Dependent Claim
19 words
An input device for electronic apparatus according to claim 1, wherein one of said switches includes a clear key.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |