Patent US2648539A successfully refreshed from Google Patents.
Patent US3726004A successfully refreshed from Google Patents.
US3726004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making printed circuit magnetic field coils
Assignee: BAE Systems Electronics Ltd
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Filing: 1970-12-28
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Granted: 1973-04-10
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Expires: 1990-12-28
Abstract
Abstract A printed circuit coil consisting of two portions to be made in cylindrical form is manufactured by joining the adjoining edges of the portions in the region of the end turns of the coil.
Inventors
- 👤 E Holland
- 👤 L Sadler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:17
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/2804; H01F5/00; H01F5/003; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/72; H01J29/76; H01J29/762; H01J29/768; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
133 words
A method of manufacturing a printed circuit magnetic field coil in two portions wherein each of said portions forms at least one half of said coil, said method comprising the steps of: forming a first one of said portions on at least one circumferential half of a cylindrical surface on which said coil is to be used such that circumferentially extending conductor portions of the coil terminate at points spaced substantially longitudinally along the axis of said cylindrical surface and along lines substantially diametrically opposed on said surface; and forming a second one of said Portions on the remaining half of the cylindrical surface such that circumferentially extending conductor portions of the second portion connect with corresponding ones of the first mentioned conductor portions along said substantially diametrically opposed lines on said surface.
Claim 2
Independent Claim
133 words
A method of manufacturing a printed circuit magnetic field coil in two portions wherein each of said portions forms at least one half of said coil, said method comprising the steps of: forming a first one of said portions on at least one circumferential half of a cylindrical surface on which said coil is to be used such that circumferentially extending conductor portions of the coil terminate at points spaced substantially longitudinally along the axis of said cylindrical surface and along lines substantially diametrically opposed on said surface; and forming a second one of said Portions on the remaining half of the cylindrical surface such that circumferentially extending conductor portions of the second portion connect with corresponding ones of the first mentioned conductor portions along said substantially diametrically opposed lines on said surface.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 8 wherein the coil is formed upon a cylindrical former by a photoetching process.
Claim 4
Dependent Claim
61 words
A method as claimed in claim 2 and which includes the steps of coating a cylindrical insulating former with conductive material, coating the conductive material with a layer of light sensitive photo-resist, exposing said layer to light through a photomaster in accordance with the desired coil pattern and developing said layer and etching the conductive material to produce the coil pattern.
Claim 5
Dependent Claim
70 words
A method as claimed in claim 3 and which includes photographing a photomaster corresponding to one coil portion upon a photo-resist coating on a conductive layer on a cylindrical insulating former so that the photograph embraces substantially one half of the surface of the cylindrical insulating former; similarly photographing said photomaster on the other half of the former and utilizing the photographs to produce a printed coil on the former.
Claim 6
Dependent Claim
61 words
A method as claimed in claim 4 wherein one half of the surface of the cylindrical insulating former is exposed to light for photographing whilst the other half is shielded from light, the cylindrical insulating former is then turned through 180* and the process repeated to produce a photograph on the other half of the surface of the cylindrical insulating former.
Claim 7
Dependent Claim
39 words
A method as claimed in claim 2 wherein the coil portions are rectangular and joining is effected in the region where the individual conductors forming the coil portions are perpendicular to the longitudinal axis of the cylindrical insulating former.
Claim 8
Dependent Claim
14 words
A method as claimed in claim 2 wherein the conductive layer is of copper.
Claim 9
Independent Claim
225 words
The method of manufacturing a printed circuit magnetic field coil having an electrically conductive strip lying on a tubular surface and being continuous between its opposite ends to define the coil, said coil including a first portion defined by discontinuous sections of said coil and a second portion defined by other discontinuous sections of said coil, the discontinuous sections of said first portion having end portions terminating at points spaced longitudinally on the tubular surface in predetermined fashion and said end portions extending circumferentially in one direction on said tubular surface and the discontinuous sections of said second portion having end portions terminating at points spaced longitudinally on the tubular surface and extending circumferentially in the other direction on said tubular surface with the spacing of said points of the second portion corresponding with that of the first portion thereby allowing corresponding end portions of the two sections to join and define said coil, which comprises the steps of: a. printing said first portion on an electrically conductive tubular surface within one circumferentially extending area thereof; b. printing said second portion on said electrically conductive tubular surface within a circumferentially extending area thereof adjoining said first area with the end portions of the sections of the second portion aligned with and in electrical continuity with corresponding end portions of the sections of said first portion.
Claim 10
Independent Claim
225 words
The method of manufacturing a printed circuit magnetic field coil having an electrically conductive strip lying on a tubular surface and being continuous between its opposite ends to define the coil, said coil including a first portion defined by discontinuous sections of said coil and a second portion defined by other discontinuous sections of said coil, the discontinuous sections of said first portion having end portions terminating at points spaced longitudinally on the tubular surface in predetermined fashion and said end portions extending circumferentially in one direction on said tubular surface and the discontinuous sections of said second portion having end portions terminating at points spaced longitudinally on the tubular surface and extending circumferentially in the other direction on said tubular surface with the spacing of said points of the second portion corresponding with that of the first portion thereby allowing corresponding end portions of the two sections to join and define said coil, which comprises the steps of: a. printing said first portion on an electrically conductive tubular surface within one circumferentially extending area thereof; b. printing said second portion on said electrically conductive tubular surface within a circumferentially extending area thereof adjoining said first area with the end portions of the sections of the second portion aligned with and in electrical continuity with corresponding end portions of the sections of said first portion.
Claim 11
Independent Claim
159 words
The method of manufacturing a tubular magnetic field coil assembly having a pair of circumferentially side-by-side coils of identical configuration and together occupying substantially the entire circumference of a tubular surface, each coil having parallel conductor portions at its opposite ends extending circumferentially of said tubular surface, which comprises the steps of: a. forming on one-half of an electrically conductive tubular surface first portions of each said pair of coils, the first portion of one coil terminating alonG a first line passing through said parallel conductor portions of said one coil and the first portion of the other coil terminating along a second line passing through said parallel conductor portions of said other coil and diametrically opposed to said first line; b. forming on the remaining half of said tubular surface said first portions of the two coils with the parallel conductor portions thereof aligned to connect with corresponding ones of the parallel conductor portions formed in step (a).
Claim 12
Independent Claim
159 words
The method of manufacturing a tubular magnetic field coil assembly having a pair of circumferentially side-by-side coils of identical configuration and together occupying substantially the entire circumference of a tubular surface, each coil having parallel conductor portions at its opposite ends extending circumferentially of said tubular surface, which comprises the steps of: a. forming on one-half of an electrically conductive tubular surface first portions of each said pair of coils, the first portion of one coil terminating alonG a first line passing through said parallel conductor portions of said one coil and the first portion of the other coil terminating along a second line passing through said parallel conductor portions of said other coil and diametrically opposed to said first line; b. forming on the remaining half of said tubular surface said first portions of the two coils with the parallel conductor portions thereof aligned to connect with corresponding ones of the parallel conductor portions formed in step (a).
Claim 13
Dependent Claim
66 words
The method as defined in claim 9 wherein the forming of steps (a) and (b) is achieved by printing which printing is done with a common mask and including the steps of exposing said electrically conductive tubular surface through the mask to perform step (a) and then rotating said electrically conductive surface through an angle of 180* with respect to said mask to perform step (b).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |