Patent US4931250A successfully refreshed from Google Patents.
US4931250A
Expired / Lapsed
US
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Multimode modem
Assignee: CIF LICENSING LLC
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Filing: 1988-05-12
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Granted: 1990-06-05
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Expires: 2008-05-12
Abstract
Abstract The modem communicates with a variety of modem types employing differing initial handshake signals. The multimode modem sends a sequence of signals corresponding to the variety of modem type handshake signals and the sequence terminates when the multimode modem receives an appropriate response identifying a particular one of the variety of modem types.
Inventors
- 👤 John A. Greszczuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:24
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
82 words
A multimode modem for communicating with a variety of modem types employing different initial handshake signals, comprising: circuitry for sending a sequence of signals corresponding to the variety of modem type handshake signals and for transmitting the sequence when the multimode modem receives a response that identifies a particular one of the variety of modem types; and circuitry for determining the particular type of modem from the received response, said determining being made simultaneously for at least two of said modem types.
Claim 2
Dependent Claim
82 words
A multimode modem for communicating with a variety of modem types employing different initial handshake signals, comprising: circuitry for sending a sequence of signals corresponding to the variety of modem type handshake signals and for transmitting the sequence when the multimode modem receives a response that identifies a particular one of the variety of modem types; and circuitry for determining the particular type of modem from the received response, said determining being made simultaneously for at least two of said modem types.
Claim 3
Dependent Claim
16 words
The multimode modem of claim 1 wherein the variety of modem types include V.32 and V.22bis.
Claim 4
Dependent Claim
20 words
The multimode modem of claim 2 where a handshake signal for the V.32 modem type is the first one transmitted.
Claim 5
Dependent Claim
39 words
The multimode modem of claim 1 further adapted to cause the sequence of handshake signals to be sent at a predetermined time after said connection is made so that the operating mode of said multimode modem can be changed.
Claim 6
Dependent Claim
62 words
The multimode modem of claim 1 wherein said multimode modem is a calling modem and said response that identifies a particular modem type is received from an answering modem, and further comprising circuitry for causing said multimode modem to establish a connection with said answering modem, and to operate in a mode that corresponds to said particular type of said answering modem.
Claim 7
Dependent Claim
24 words
The multimode modem of claim 1 wherein said circuitry for determining determines said particular type of modem simultaneously for all of said modem types.
Claim 8
Dependent Claim
28 words
The multimode modem of claim 1 wherein said circuitry for determining determines said particular type of modem simultaneously with said sending of said sequence and receiving said response.
Claim 9
Dependent Claim
45 words
The multimode modem of claim 1 wherein said circuitry for determining comprises at least two filters, which correspond to said at least two modem types, that are adapted to simultaneously receive said response, said filters producing output signals that indicate said particular type of modem.
Claim 10
Independent Claim
80 words
A method for operating a multimode modem of the kind that communicates with a variety of modem types employing different initial handshake signals, comprising: sending a sequence of signals corresponding to the variety of modem type handshake signals and terminating the sequence when the multimode modem receives a response that identifies a particular one of the variety of modem types; and determining, simultaneously for at least two of said modem types, the particular type of modem from the received response.
Claim 11
Independent Claim
80 words
A method for operating a multimode modem of the kind that communicates with a variety of modem types employing different initial handshake signals, comprising: sending a sequence of signals corresponding to the variety of modem type handshake signals and terminating the sequence when the multimode modem receives a response that identifies a particular one of the variety of modem types; and determining, simultaneously for at least two of said modem types, the particular type of modem from the received response.
Claim 12
Dependent Claim
15 words
The method of claim 9 wherein the variety of modem types include V.32 and V.22bis.
Claim 13
Dependent Claim
26 words
The method of claim 10 further comprising transmitting a handshake signal for the V.32 modem type before transmitting a handshake signal for the V.22bis modem type.
Claim 14
Dependent Claim
59 words
The method of claim 9 wherein said multimode modem is a calling modem and said response that identifies a particular modem type is received from an answering modem, and further comprising causing said multimode modem to establish a connection with said answering modem, and to operate in a mode that corresponds to said particular type of said answering modem.
Claim 15
Dependent Claim
37 words
The method of claim 12 further comprising causing the sequence of handshake signals to be sent at a predetermined time after said connection is made so that the operating mode of said multimode modem can be changed.
Claim 16
Dependent Claim
17 words
The method of claim 9 wherein said determining is made simultaneously for all of said modem types.
Claim 17
Dependent Claim
21 words
The method of claim 9 wherein said determining is made simultaneously with said sending of said sequence and receiving said response.
Claim 18
Dependent Claim
39 words
The method of claim 9 wherein said determining comprises simultaneously applying said response to at least two filters, which correspond to said at least two modem types, said filters producing output signals that indicate said particular type of modem.
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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) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |