US4847863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable modular data modem
Assignee: QUADRAM LP A OF LP
•
Filing: 1985-10-03
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Granted: 1989-07-11
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Expires: 2005-10-03
Abstract
Abstract Expandable data modem for data transmission of digital data at certain defined data rates which includes a base for mounting those components of the modem which are data-rate independent and a sub-base for mounting all data-rate-dependent components, and a two-part plug-in connector for detachably plugging the sub-base into the base. In this way the modem can be expanded to higher data rates by simply replacing the sub-base with its data rate-dependent components instead of replacing the entire modem. In a preferred embodiment the base and the sub-base are two printed circuit boards joined by a card-edge connector.
Inventors
- 👤 Bruce W. Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:26
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
63 words
A data-rate-expandable data modem for data transmission of digital data at defined data rates which comprises: a modem component mounting base including data line interconnection components, and computer interface components mounted thereon; a data rate expansion board including data modulation and demodulation components mounted thereon; manually detachable connecting means for detachably attaching said data rate expansion board to the modem component mounting base.
Claim 2
Dependent Claim
63 words
A data-rate-expandable data modem for data transmission of digital data at defined data rates which comprises: a modem component mounting base including data line interconnection components, and computer interface components mounted thereon; a data rate expansion board including data modulation and demodulation components mounted thereon; manually detachable connecting means for detachably attaching said data rate expansion board to the modem component mounting base.
Claim 3
Dependent Claim
17 words
An expandable modem according to claim 1 wherein said expansion-board-mounted components include a modulator and a demodulator.
Claim 4
Dependent Claim
15 words
An expandable modem according to claim 2 wherein said expansion-board-mounted components include a clock generator.
Claim 5
Dependent Claim
15 words
An expandable modem according to claim 2 wherein said expansion-board-mounted components include power supply components.
Claim 6
Dependent Claim
15 words
An expandable modem according to claim 2 wherein said expansion-board-mounted components include line equalizing components.
Claim 7
Dependent Claim
21 words
An expandable modem according to claim 2 wherein said expansion-board-mounted components include a microcomputer with memory for storing a control program.
Claim 8
Dependent Claim
19 words
An expandable modem according to claim 3, wherein said expansion-board-mounted components include power supply components and line equalizing components.
Claim 9
Dependent Claim
19 words
An expandable modem according to claim 1 wherein said modem component mounting base is a printed circuit mother board.
Claim 10
Dependent Claim
16 words
An expandable modem according to claim 8 wherein said sub-base includes a printed circuit daughter board.
Claim 11
Dependent Claim
41 words
An expandable modem according to claim 1 wherein said connecting means further comprise: a first plug-in connector attached to said base, a second plug-in connector attached to said expansion board; said first and second plug-in connectors matingly connectable to one another.
Claim 12
Dependent Claim
17 words
An expandable modem according to claim 9 wherein said connecting means include two matingly connectable card-edge conectors.
Claim 13
Dependent Claim
20 words
An expandable modem according to claim 8 wherein said mother board is a drop-in circuit board for a personal computer.
Claim 14
Dependent Claim
12 words
An expandable modem according to claim 1 further comprising a line monitor.
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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) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |