US4881129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Facsimile interface device for land-mobile telephones
Assignee: Keihin Co Ltd
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Filing: 1988-09-02
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Granted: 1989-11-14
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Expires: 2008-09-02
Abstract
Abstract A facsimile interface device for a land-mobile telephone system includes a changeover circuit for connecting and disconnecting a facsimile device with a land-mobile telephone circuit, and a matching circuit for electrically matching the facsimile device to the telephone circuit. The interface device further includes a control circuit for determining based on the position of a mode select switch whether a signal received is for the telephone circuit or the facsimile device, and for controlling the changeover circuit accordingly.
Inventors
- 👤 Yasuhiro Mitsuhashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:21
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04N; H04N1/00; H04N1/00095; H04N1/00103; H04N1/00106; H04N1/00127; H04N1/00281; H04N1/32; H04N1/327; H04N1/32704; H04N1/32706; H04N1/32708; H04N1/32715; H04N1/32721; H04N1/32728; H04N1/32747; H04N1/32752; H04N1/32756; H04N2201/00; H04N2201/0008; H04N2201/0034; Y; Y10; Y10S; Y10S379/00; Y10S379/902
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
161 words
An interface device for connection to a radio transmitter/receiver, a telephone set, and a facsimile device, said interface device comprising: a mode select means for selecting an operational mode of said interface device; a changeover means for selectively connecting one of the telephone set and the facsimile device to the radio transmitter/receiver in accordance with a changeover signal supplied thereto; a matching means connected to said changeover means for electrically matching the radio transmitter/receiver with the facsimile device; a control means connected to said changeover means for determining based on said operational mode whether a signal received from said radio transmitter/receiver is to be transmitted to said telephone set or said facsimile device, and for outputting said changeover signal to said changeover means in accordance with the determination as to whether a signal received from said radio transmitter/receiver is to be transmitted to said telephone set or said facsimile device, and for setting said facsimile device into an automatic receiving mode.
Claim 2
Dependent Claim
161 words
An interface device for connection to a radio transmitter/receiver, a telephone set, and a facsimile device, said interface device comprising: a mode select means for selecting an operational mode of said interface device; a changeover means for selectively connecting one of the telephone set and the facsimile device to the radio transmitter/receiver in accordance with a changeover signal supplied thereto; a matching means connected to said changeover means for electrically matching the radio transmitter/receiver with the facsimile device; a control means connected to said changeover means for determining based on said operational mode whether a signal received from said radio transmitter/receiver is to be transmitted to said telephone set or said facsimile device, and for outputting said changeover signal to said changeover means in accordance with the determination as to whether a signal received from said radio transmitter/receiver is to be transmitted to said telephone set or said facsimile device, and for setting said facsimile device into an automatic receiving mode.
Claim 3
Dependent Claim
47 words
An interface device as claimed in claim 1, wherein said control means further comprises a means for supplying power to said facsimile device when said facsimile device is in said automatic receiving mode and a signal is being transmitted from said radio transmitter/receiver to said facsimile device.
Claim 4
Dependent Claim
36 words
An interface device as claimed in claim 1, wherein said control means further includes a means for sending a off-hook signal to said radio transmitter/receiver in response to a detected off-hook signal from said telephone set.
Claim 5
Dependent Claim
36 words
An interface device as claimed in claim 2, wherein said control means further includes a means for sending a hook signal to said radio transmitter/receiver in response to a detected hook signal from said telephone set.
Claim 6
Dependent Claim
38 words
An interface device as claimed in claim 1, wherein said matching means comprises a hybrid circuit which is connected to said changeover circuit and a matching transformer which is connected between said hybrid circuit and said facsimile device.
Claim 7
Dependent Claim
38 words
An interface device as claimed in claim 2, wherein said matching means comprises a hybrid circuit which is connected to said changeover circuit and a matching transformer which is connected between said hybrid circuit and said facsimile device.
Claim 8
Dependent Claim
38 words
An interface device as claimed in claim 3, wherein said matching means comprises a hybrid circuit which is connected to said changeover circuit and a matching transformer which is connected between said hybrid circuit and said facsimile device.
Claim 9
Dependent Claim
38 words
An interface device as claimed in claim 4, wherein said matching means comprises a hybrid circuit which is connected to said changeover circuit and a matching transformer which is connected between said hybrid circuit and said facsimile device.
Claim 10
Dependent Claim
49 words
An interface device as claimed in claim 5, wherein said control means further includes a means for generating an alternating signal to be supplied to said matching transformer via said changeover circuit, wherein said matching transformer superposes said alternating signal with a facsimile signal received from said radio transmitter/receiver.
Claim 11
Dependent Claim
49 words
An interface device as claimed in claim 6, wherein said control means further includes a means for generating an alternating signal to be supplied to said matching transformer via said changeover circuit, wherein said matching transformer superposes said alternating signal with a facsimile signal received from said radio transmitter/receiver.
Claim 12
Dependent Claim
49 words
An interface device as claimed in claim 7, wherein said control means further includes a means for generating an alternating signal to be supplied to said matching transformer via said changeover circuit, wherein said matching transformer superposes said alternating signal with a facsimile signal received from said radio transmitter/receiver.
Claim 13
Dependent Claim
49 words
An interface device as claimed in claim 8, wherein said control means further includes a means for generating an alternating signal to be supplied to said matching transformer via said changeover circuit, wherein said matching transformer superposes said alternating signal with a facsimile signal received from said radio transmitter/receiver.
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) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |