US4376274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit transformers
Assignee: Communications Patents Ltd
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Filing: 1981-09-29
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Granted: 1983-03-08
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Expires: 2001-09-29
Abstract
Abstract A printed circuit transformer comprises one primary track and two secondary tracks, the three tracks being located adjacent and substantially parallel to each other with one side of one of the secondary tracks and the other secondary track being connected to a common source of potential. The primary track is located between the secondary tracks and all the tracks are printed wholly on one side of the circuit board.
Inventors
- 👤 Daniel H. Smart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:32
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/2804; H05; H05K; H05K1/00; H05K1/16; H05K1/165; H05K1/02; H05K1/0286; H05K1/0293; H05K2201/00; H05K2201/03; H05K2201/0302; H05K2201/0305; H05K2201/09; H05K2201/09209; H05K2201/09218; H05K2201/09236; H05K2201/0929; H05K2201/093; H05K2201/09654; H05K2201/09663; H05K2203/00; H05K2203/17; H05K2203/171
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
76 words
A printed circuit transformer comprising one primary track and two secondary tracks, the three tracks being located adjacent and substantially parallel to each other with one end of one of the secondary tracks and the other end of the other secondary track being connected to a common source of potential, characterised in that the primary track is located between the secondary tracks and all the tracks are printed wholly on one side of the circuit board.
Claim 2
Dependent Claim
76 words
A printed circuit transformer comprising one primary track and two secondary tracks, the three tracks being located adjacent and substantially parallel to each other with one end of one of the secondary tracks and the other end of the other secondary track being connected to a common source of potential, characterised in that the primary track is located between the secondary tracks and all the tracks are printed wholly on one side of the circuit board.
Claim 3
Dependent Claim
107 words
A printed circuit transformer according to claim 1, characterised in that the secondary tracks are connected to a common printed conductive area extending to adjacent the ends of all of the tracks, the printed conductive area also extending parallel to at least a proportion of each of the secondary tracks such that an elongate gap is defined between the printed conductive area and at least part of the length of each secondary track, whereby the effective length of one or both of the secondary tracks may be reduced by bridging a portion of the gap between that track and the printed conductive area with a conductive material.
References Cited (Backward Citations)
DE2230587A1
Cited
JPS54110424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |