Patent US4843262A successfully refreshed from Google Patents.
US4843262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pull up or pull down electronic device
Assignee: Canon Inc
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Filing: 1987-07-31
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Granted: 1989-06-27
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Expires: 2007-07-31
Abstract
Abstract An electronic device with an output terminal to be pulled up or down to a predetermined potential has a constant current circuit for use in pulling up or down the output terminal.
Inventors
- 👤 Yoshihiro Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:25
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/01; H03K19/013; H03K19/0136; H03K19/017; H03K19/01707; H03K19/01721
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
65 words
An electronic device comprising: a voltage source of a predetermined potential; first constant current means comprising a first field effect transistor coupled so that it operates within a saturation range; and an output terminal connected to said voltage source through said first constant current means said output terminal being pulled up or down to the predetermined potential, in response to said first constant current means.
Claim 2
Dependent Claim
65 words
An electronic device comprising: a voltage source of a predetermined potential; first constant current means comprising a first field effect transistor coupled so that it operates within a saturation range; and an output terminal connected to said voltage source through said first constant current means said output terminal being pulled up or down to the predetermined potential, in response to said first constant current means.
Claim 3
Dependent Claim
24 words
An electronic device according to claim 1, further comprising a second constant current means connected to a gate of said first field effect transistor.
Claim 4
Dependent Claim
20 words
An electronic device according to claim 2, wherein said second constant current means includes a transistor and a resistor element.
Claim 5
Dependent Claim
22 words
An electronic device according to claim 3, wherein said transistor of said second constant current means is a second field effect transistor.
Claim 6
Dependent Claim
25 words
An electronic device according to claim 4, wherein said first field effect transistor and said second field effect transistor have the same channel conductivity type.
Claim 7
Dependent Claim
17 words
An electronic device according to claim 3, wherein said resistor element comprises a third field effect transistor.
Claim 8
Dependent Claim
89 words
An input/output circuit for either receiving an input from or providing an output signal to an external circuit, said input/output circuit comprising: (a) an input and/or output terminal selectively connected to the external circuit; (b) a first circuit element connected to said input and/or output terminal and providing a second input and/or output terminal; and (c) a first constant current means connected to said input and/or output terminal wherein said first constant current means comprises a first field effect transistor coupled so that it operates within a saturation range.
Claim 9
Dependent Claim
89 words
An input/output circuit for either receiving an input from or providing an output signal to an external circuit, said input/output circuit comprising: (a) an input and/or output terminal selectively connected to the external circuit; (b) a first circuit element connected to said input and/or output terminal and providing a second input and/or output terminal; and (c) a first constant current means connected to said input and/or output terminal wherein said first constant current means comprises a first field effect transistor coupled so that it operates within a saturation range.
Claim 10
Dependent Claim
24 words
An input/output circuit according to claim 7, further comprising a second constant current means connected to a gate of said first field effect transistor.
Claim 11
Dependent Claim
20 words
An input/output circuit according to claim 8, wherein said second constant current means includes a transistor and a resistor element.
Claim 12
Dependent Claim
22 words
An input/output circuit according to claim 9, wherein said transistor of said second constant current means is a second field effect transistor.
Claim 13
Dependent Claim
25 words
An input/output circuit according to claim 10, wherein said first field effect transistor and said second field effect transistor have the same channel conductivity type.
Claim 14
Dependent Claim
17 words
An input/output circuit according to claim 9, wherein said resistor element comprises a third field effect transistor.
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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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |