US4839531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Computer network interconnecting apparatus
Assignee: Boeing Co
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Filing: 1987-10-14
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Granted: 1989-06-13
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Expires: 2007-10-14
Abstract
Abstract An interconnect device permits use of 150 ohm twisted pair transmission lines to interconnect computers designed for use with 75 ohm coaxial cable. The device includes a pair of toroidal transformers mounted in an aluminum housing and separated by a Faraday shield. The primary winding of each transformer is connected to a separate coaxial connector. The second winding of each transformer is connected over a separate a twisted conductor pair to one terminal of a balanced data connector assembly.
Inventors
- 👤 Duane G. Stemmons
- 👤 John P. Noonan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:33
CPC Classifications
H; H02; H02J; H02J3/00; H03; H03H; H03H7/00; H03H7/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
Apparatus for interconnecting a computer to a network comprising: a housing of conductive material; a pair of toroidal transformers mounted in said housing, each of said transformers comprising a toroidal core of ferrite material, a balanced winding, and an unbalanced winding; a pair of first connection means for receiving a balanced conductor, each of said first connection means being connected to a separate one of said balanced windings; and a pair of second connection means mounted on said housing for receiving an unbalanced conductor, each of said second connection means being connected to a separate one of said unbalanced windings.
Claim 2
Dependent Claim
100 words
Apparatus for interconnecting a computer to a network comprising: a housing of conductive material; a pair of toroidal transformers mounted in said housing, each of said transformers comprising a toroidal core of ferrite material, a balanced winding, and an unbalanced winding; a pair of first connection means for receiving a balanced conductor, each of said first connection means being connected to a separate one of said balanced windings; and a pair of second connection means mounted on said housing for receiving an unbalanced conductor, each of said second connection means being connected to a separate one of said unbalanced windings.
Claim 3
Dependent Claim
16 words
Apparatus as recited in claim 1 wherein said housing comprises a Faraday shield between said transformers.
Claim 4
Dependent Claim
12 words
Apparatus as recited in claim 1 wherein said windings are helically wound.
Claim 5
Dependent Claim
19 words
Apparatus as recited in claim 1 wherein said pair of second connection means comprises a pair of coaxial connectors.
Claim 6
Dependent Claim
33 words
Apparatus as recited in claim 4 wherein said pair of first connection means each have a characteristic impedance of 150 ohms and said coaxial connectors each have a characteristic impedance of 75 ohms.
Claim 7
Dependent Claim
22 words
Apparatus as recited in claim 5 wherein said balanced windings each have 20 turns and said unbalanced windings each have 14 turns.
Claim 8
Dependent Claim
26 words
Apparatus as recited in claim 6 wherein said balanced windings are each formed of 30-gauge wire and said unbalanced windings are each formed of 26-gauge wire.
References Cited (Backward Citations)
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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) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |