US4639708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parallelogram electric coil helically wound
Assignee: Development Finance Corp of New Zealand
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Filing: 1985-02-19
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Granted: 1987-01-27
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Expires: 2005-02-19
Abstract
Abstract An electric coil is printed onto a flexible sheet so that it can be bent into any desired shape to create a complex magnetic field. A flexible parallelogram substrate, having a two-coil pattern printed thereon, can be bent into a cylinder so that the coil pattern at the ends of the cylinder generate an axial magnetic field while the remainder of the coil pattern on the cylinder can generate a transverse field varying continuously through 90°.
Inventors
- 👤 John D. Weatherly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:57
CPC Classifications
H; H01; H01F; H01F5/00; H01F5/003; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
A cylindrical coil, with electrically conductive elements arranged to create a magnetic field therein, said magnetic field having an axial component and a transverse component, wherein the said transverse component rotates through 90° over at least part of the length of the coil; said coil being formed from a substrate having said electrically conductive elements thereon, said electrically conductive elements comprising at least one spiral of electrically conductive material in the shape of a parallelogram on a planar surface of the substrate, said at least one spiral being in turn wound around the cylinder as at least one helix.
Claim 2
Dependent Claim
99 words
A cylindrical coil, with electrically conductive elements arranged to create a magnetic field therein, said magnetic field having an axial component and a transverse component, wherein the said transverse component rotates through 90° over at least part of the length of the coil; said coil being formed from a substrate having said electrically conductive elements thereon, said electrically conductive elements comprising at least one spiral of electrically conductive material in the shape of a parallelogram on a planar surface of the substrate, said at least one spiral being in turn wound around the cylinder as at least one helix.
Claim 3
Dependent Claim
53 words
A cylindrical coil as claimed in claim 1, said coil being formed from a flat flexible substrate, having said electrically conductive elements printed thereon in the shape of at least one spiral parallelogram, said substrate being rolled to form a cylinder, on which said electrically conductive elements appear as at least one helix.
Claim 4
Dependent Claim
70 words
A cylindrical coil, with electrically conductive elements arranged to create a magnetic field therein, said coil being formed from a substrate having said electrically conductive elements thereon, said electrically conductive elements comprising at least one spiral of electrically conductive material in the shape of a parallelogram on a planar surface of the substrate, said at least one spiral being in turn wound around the cylinder as at least one helix.
Claim 5
Dependent Claim
70 words
A cylindrical coil, with electrically conductive elements arranged to create a magnetic field therein, said coil being formed from a substrate having said electrically conductive elements thereon, said electrically conductive elements comprising at least one spiral of electrically conductive material in the shape of a parallelogram on a planar surface of the substrate, said at least one spiral being in turn wound around the cylinder as at least one helix.
Claim 6
Dependent Claim
32 words
A cylindrical coil as claimed in claim 3, said electrically conductive elements being in the shape of at least one quadrangular parallelogram having two opposite acute angles and two opposite obtuse angles.
Claim 7
Dependent Claim
42 words
A cylindrical coil as claimed in claim 4, in which two opposite sides of said at least one quadrangular parallelogram are parallel to the ends of the cylinder and the other two opposite sides of the parallelogram have the shape of helices.
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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) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |