Patent US3898595A successfully refreshed from Google Patents.
US3898595A
Expired / Lapsed
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Magnetic printed circuit
Assignee: CUNNINGHAM CORP
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Filing: 1972-03-30
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Granted: 1975-08-05
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Expires: 1992-03-30
Abstract
Abstract A printed magnetic circuit board comprises a thin layer or sheet of magnetically permeable material (such as steel) laminated to an insulating baseboard which, after photo-etching, forms different desired magnetic circuit patterns. At least the exposed surface of the magnetic circuit is electroplated with copper or other material to prevent oxidation and to provide a degree of electrical shielding for the magnetic circuit. An electrical printed circuit is also available on the other side of the baseboard for use in forming electrical circuits cooperating with the magnetic printed circuits on the first side to result in a desired electromagnetic device. Specific printed magnetic circuit patterns are provided for use in a matrix of individually operable reed relays, a multiple pole reed relay, a relay or choke core and a transformer core.
Inventors
- 👤 Larry L Launt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:03
CPC Classifications
H; H01; H01H; H01H36/00; H01H36/0006; H01H36/0033; H01F; H01F27/00; H01F27/28; H01F27/2804; H01F3/00; H01F3/10; H01F3/12; H01H51/00; H01H51/28; H05; H05K; H05K1/00; H05K1/16; H05K1/165; H05K9/00; H05K9/0007; H05K9/002; H05K9/0039; H01F17/00; H01F17/0006; H01F17/0033; H01H50/00; H01H50/10; H05K1/02; H05K1/09; H05K2201/00; H05K2201/08; H05K2201/083; H05K2201/086; H05K2201/09; H05K2201/09209; H05K2201/09654; H05K2201/097; H05K2201/10; H05K2201/10007; H05K2201/10053; H05K3/00; H05K3/02; H05K3/06; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12389; Y10T428/12396; Y10T428/12493; Y10T428/12535; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/12917; Y10T428/12924
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
A magnetic printed circuit board in combination with a matrix of electrical reed relays, said matrix including at least one reed switch having a pair of magnetic switch elements and at least one electromagnetic coil with a pair of magnetic pole units extending from each end thereof for actuating said reed switch elements, said magnetic printed circuit board comprising: a baseboard of insulating material, and a pattern of magnetically permeable material laminated in a thin layer to one side of said baseboard, said magnetic layer forming at least one cell pattern corresponding to each electromagnetic coil and the reed switch to be actuated thereby, each said cell pattern including a pair of spaced-apart pole piece areas disposed so that each pole piece area is in magnetic connection with a respective magnetic pole unit of said actuating coil and with one respective magnetic element of each said reed switch.
Claim 2
Dependent Claim
148 words
A magnetic printed circuit board in combination with a matrix of electrical reed relays, said matrix including at least one reed switch having a pair of magnetic switch elements and at least one electromagnetic coil with a pair of magnetic pole units extending from each end thereof for actuating said reed switch elements, said magnetic printed circuit board comprising: a baseboard of insulating material, and a pattern of magnetically permeable material laminated in a thin layer to one side of said baseboard, said magnetic layer forming at least one cell pattern corresponding to each electromagnetic coil and the reed switch to be actuated thereby, each said cell pattern including a pair of spaced-apart pole piece areas disposed so that each pole piece area is in magnetic connection with a respective magnetic pole unit of said actuating coil and with one respective magnetic element of each said reed switch.
Claim 3
Dependent Claim
55 words
A magnetic printed circuit board as in claim 1 further comprising: a printed electrical circuit pattern on the other side of said insulating baseboard opposite said magnetic circuit for use in completing electrical circuits associated with said reed switches, and connecting means for connecting electrical leads from said reed switches to said printed electrical circuit.
Claim 4
Dependent Claim
42 words
A magnetic printed circuit board as in claim 1 further comprising: a very thin coating of copper over at least the exposed surface of said thin layer of magnetic material to provide electrical shielding and to prevent oxidation of said magnetic layer.
Claim 5
Dependent Claim
46 words
A magnetic printed circuit board as in claim 1 wherein: said spaced-apart pole piece areas are elongated to receive a plurality of reed switches disposed therebetween for common switching by one electromagnetic coil having its respective pole units in magnetic circuit with said pole piece areas.
Claim 6
Dependent Claim
31 words
A magnetic printed circuit board as in claim 4 further comprising a similar printed magnetic circuit similarly disposed on the opposite side of said reed switches and of said pole units.
Claim 7
Dependent Claim
121 words
A magnetic printed circuit board as in claim 1 wherein said pattern of said magnetic material further comprises a matrix of said cells in adjacent and interconnected relationship, each cell including a pair of said spaced-apart pole piece areas for connecting magnetically with a respective actuating coil and with the magnetic elements of reed switches disposed thereacross, and at least one thin leg connecting each of said pole piece areas with said matrix of cells, the leg providing an effective electrical connection for electrical shielding purposes but so thin that it results in a relatively high magnetic reluctant such that the selective operation of the magnetic reed switch in one cell will not inadvertently operate other reed switches in other cells.
Claim 8
Dependent Claim
61 words
A magnetic printed circuit board as in claim 6 wherein: said matrix of cells comprises a honeycomb pattern of six-sided cells, said pole piece areas comprise generally rectilinear areas disposed in line between two directly opposing apices of said six-sided cells, and said thin leg comprises a thin connection between each of said pole piece areas and its associated cellular apex.
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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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |