Patent US5473675A successfully refreshed from Google Patents.
US5473675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Call establishment for simultaneous analog and digital communications
Assignee: SOLMIRA COMMUNICATIONS LLC
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Filing: 1993-11-12
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Granted: 1995-12-05
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Expires: 2013-11-12
Abstract
Abstract A modem, capable of simultaneously coupling voice and data signals, connects local digital terminal equipment (DTE) and a local telephone to a communications link. To prevent the local DTE from responding to a communications containing only voice signals, the local DTE is notified of an incoming communication only after detection of calling tone signals on the communications link. Such signals indicate a remote DTE desires to establish a data communications path with the local DTE. This operation advantageously prevents the modem from transmitting an annoying answer tone to a calling party.
Inventors
- 👤 Joseph Q. Chapman
- 👤 Kurt E. Holmquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:27
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
Apparatus for use with first data terminal equipment deposited at a first end of a communications link, said apparatus comprising: a port for connecting to said communications link; switch means connected to said port; a hybrid coupled to said switch means; a modulator/demodulator coupled to said hybrid; first means for coupling to said hybrid, through said modulator/demodulator, a communication device, which communication device has an "off-hook" signaling means; and second means for coupling said "off-hook" signaling means to said switch means.
Claim 2
Dependent Claim
81 words
Apparatus for use with first data terminal equipment deposited at a first end of a communications link, said apparatus comprising: a port for connecting to said communications link; switch means connected to said port; a hybrid coupled to said switch means; a modulator/demodulator coupled to said hybrid; first means for coupling to said hybrid, through said modulator/demodulator, a communication device, which communication device has an "off-hook" signaling means; and second means for coupling said "off-hook" signaling means to said switch means.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 further comprising means for coupling to said modulator/demodulator, a second data terminal equipment.
Claim 4
Dependent Claim
12 words
The apparatus of claim 1 wherein said communication device is a telephone.
Claim 5
Dependent Claim
23 words
The apparatus of claim 1 wherein said means for coupling said "off-hook" signalling means to said switch means comprises an "off-hook" detection means.
Claim 6
Dependent Claim
62 words
The apparatus of claim 2 wherein said means for coupling said second data terminal equipment to said modulator/demodulator includes: means for detecting the presence of predetermined signals on said port following ringing signals on said port; and means responsive to the detected presence of said predetermined signals for communicating protocol signals to said port for transmission to said first data terminal equipment.
Claim 7
Dependent Claim
13 words
The apparatus of claim 5 wherein said predetermined signals are calling tone signals.
Claim 8
Dependent Claim
14 words
The apparatus of claim 5 wherein said protocol signals form a predetermined digital message.
Claim 9
Dependent Claim
48 words
The apparatus of claim 7 wherein said predetermined digital message initiates a predetermined sequence of communications between said second data terminal equipment and said first data terminal equipment when coupled to said port to establish a data communication connection between said first and said second data terminal equipment.
Claim 10
Dependent Claim
24 words
The apparatus of claim 2 wherein said communication device and said second data terminal equipment can alternate their use in a single communication session.
Claim 11
Dependent Claim
24 words
The apparatus of claim 2 wherein a communication session uses either said communication device or said second data communication equipment pursuant to user selection.
Claim 12
Dependent Claim
25 words
The apparatus of claim 2 wherein said modulator/demodulator is of the type which can simultaneously transmit analog and digital signals during a single communication session.
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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) | 1998-12-04 | 1999-06-05 | 1999-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-04 | 2003-06-05 | 2003-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-04 | 2007-06-05 | 2007-12-05 | $7700.00 | Window Closed / Lapsed |