Patent US2789431A successfully refreshed from Google Patents.
US4947423A
Expired / Lapsed
US
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Communication apparatus with facilities for changing to a pulse or dial mode
Assignee: Canon Inc
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Filing: 1988-12-29
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Granted: 1990-08-07
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Expires: 2008-12-29
Abstract
Abstract A communication apparatus includes a pulse dial signal generator, a tone dial signal generator, a switching circuit including a self-return switch and a self-non-return switch, for switching the pulse dial generator and the tone dial generator, a plurality of input keys such as a ten-key pad for inputting data, and a dialer circuit for switching at least one of the input keys in synchronism with an operation of the switching circuit.
Inventors
- 👤 Tsunehiro Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:17
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
A communication apparatus comprising: dialing means having a first mode for dialing a pulse dial signal and a second mode for sending a tone dial signal; switching means for changing over a mode of said dialing means between said first and second modes; key input means; and control means for temporarily changing over the first mode to the second mode in response to a key input by said key input means when the first mode is selected, and for conducting a control different from mode changeover in response to a key input by said key input means when the second mode is selected.
Claim 2
Dependent Claim
103 words
A communication apparatus comprising: dialing means having a first mode for dialing a pulse dial signal and a second mode for sending a tone dial signal; switching means for changing over a mode of said dialing means between said first and second modes; key input means; and control means for temporarily changing over the first mode to the second mode in response to a key input by said key input means when the first mode is selected, and for conducting a control different from mode changeover in response to a key input by said key input means when the second mode is selected.
Claim 3
Dependent Claim
38 words
An apparatus according to claim 1, wherein said control means discriminates a condition of said switching means and conducts a control in response to a key input by said key input means in accordance with the discriminated condition.
Claim 4
Dependent Claim
33 words
An apparatus according to claim 1, wherein the temporary mode changeover in response to the key input means is released in response to an on-hook condition of a line of said communication apparatus.
Claim 5
Dependent Claim
23 words
An apparatus according to claim 1, wherein said control means performs redialing control in response to a key input in the second mode.
Claim 6
Dependent Claim
19 words
An apparatus according to claim 1, wherein a key input is changed in linkage connection with said switching means.
Claim 7
Dependent Claim
142 words
A communication apparatus comprising: dialing means having a first mode for sending a pulse dial signal and a second mode for sending a tone dial signal; switching means for changing over a mode of said dialing means between said first and second modes; key input means for temporarily changing over the first mode to the second mode in response when the first mode is selected; detecting means for detecting an off-hook condition of a line of said communication apparatus; and control means for temporarily changing over the first mode to the second mode in response to a key input by said key input means when both the first mode is selected and the off-hook condition of the line is detected, wherein the temporary changing-over in response to said key input means is released in response to an on-hook condition of said line.
Claim 8
Dependent Claim
142 words
A communication apparatus comprising: dialing means having a first mode for sending a pulse dial signal and a second mode for sending a tone dial signal; switching means for changing over a mode of said dialing means between said first and second modes; key input means for temporarily changing over the first mode to the second mode in response when the first mode is selected; detecting means for detecting an off-hook condition of a line of said communication apparatus; and control means for temporarily changing over the first mode to the second mode in response to a key input by said key input means when both the first mode is selected and the off-hook condition of the line is detected, wherein the temporary changing-over in response to said key input means is released in response to an on-hook condition of said line.
Claim 9
Dependent Claim
38 words
An apparatus according to claim 6, wherein said control means discriminates a condition of said switching means and conducts a control in response to a key input by said key input means in accordance with the discriminated condition.
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) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |