US4027295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic bubble device
Assignee: Fujitsu Ltd
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Filing: 1974-11-29
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Granted: 1977-05-31
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Expires: 1994-11-29
Abstract
Abstract A magnetic bubble device has a flat faced drive coil consisting of electrically conductive material having flat windings. The magnetic bubble chip of the device is positioned in the magnetic field produced by the flat faced coil.
Inventors
- 👤 Harumi Maegawa
- 👤 Junzo Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:16
CPC Classifications
H; H01; H01F; H01F5/00; H01F5/003; G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; H01F13/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
208 words
A magnetic bubble device having a plurality of magnetic bubble chips each consisting of magnetic material for producing a magnetic bubble under the effect of a bias magnetic field, each of said magnetic bubble chips having a surface, said magnetic bubble device comprising, a plurality of drive coils for producing a rotating magnetic field substantially parallel to the surfaces of the magnetic bubble chips, said plurality of drive coils including a flat faced coil consisting of electrically conductive material having flat windings, said flat faced coil producing a magnetic field substantially in its own plane, each of the magnetic bubble chips being positioned in a corresponding one of a plurality of areas where each direction of rotation of the magnetic field produced by the drive coils and acting on the magnetic bubble chip is different, selected ones of the magnetic bubble chips being positioned in areas where the rotating magnetic field acts clockwise and selected others of the magnetic bubble chips being positioned in areas where the rotating magnetic field acts counterclockwise, said ones of the magnetic bubble chips and said others of the magnetic bubble chips being in juxtaposition whereby the magnetic bubble produced by each of the magnetic bubble chips is shiftable in a positive direction.
Claim 2
Dependent Claim
208 words
A magnetic bubble device having a plurality of magnetic bubble chips each consisting of magnetic material for producing a magnetic bubble under the effect of a bias magnetic field, each of said magnetic bubble chips having a surface, said magnetic bubble device comprising, a plurality of drive coils for producing a rotating magnetic field substantially parallel to the surfaces of the magnetic bubble chips, said plurality of drive coils including a flat faced coil consisting of electrically conductive material having flat windings, said flat faced coil producing a magnetic field substantially in its own plane, each of the magnetic bubble chips being positioned in a corresponding one of a plurality of areas where each direction of rotation of the magnetic field produced by the drive coils and acting on the magnetic bubble chip is different, selected ones of the magnetic bubble chips being positioned in areas where the rotating magnetic field acts clockwise and selected others of the magnetic bubble chips being positioned in areas where the rotating magnetic field acts counterclockwise, said ones of the magnetic bubble chips and said others of the magnetic bubble chips being in juxtaposition whereby the magnetic bubble produced by each of the magnetic bubble chips is shiftable in a positive direction.
Claim 3
Dependent Claim
150 words
A magnetic bubble device having a magnetic bubble chip consisting of magnetic material for producing a magnetic bubble, said magnetic bubble chip having a surface, said magnetic bubble device comprising, drive coil means for producing a rotating magnetic field substantially parallel to the surface of the magnetic bubble chip, said drive coil means including a flat faced coil consisting of electrically conductive material having flat windings, said flat faced coil producing a magnetic field substantially in its own plane, and said magnetic bubble chip being positioned in the magnetic field produced by said flat faced coil, said drive coil means comprising a pair of flat faced coils in substantially parallel planes and crossing each other; and a conductive plate of electrically conductive material substantially parallel to the flat faced coils and in facing relation therewith, said magnetic bubble chip being positioned between the flat faced coils and the conductive plate.
Claim 4
Dependent Claim
150 words
A magnetic bubble device having a magnetic bubble chip consisting of magnetic material for producing a magnetic bubble, said magnetic bubble chip having a surface, said magnetic bubble device comprising, drive coil means for producing a rotating magnetic field substantially parallel to the surface of the magnetic bubble chip, said drive coil means including a flat faced coil consisting of electrically conductive material having flat windings, said flat faced coil producing a magnetic field substantially in its own plane, and said magnetic bubble chip being positioned in the magnetic field produced by said flat faced coil, said drive coil means comprising a pair of flat faced coils in substantially parallel planes and crossing each other; and a conductive plate of electrically conductive material substantially parallel to the flat faced coils and in facing relation therewith, said magnetic bubble chip being positioned between the flat faced coils and the conductive plate.
References Cited (Backward Citations)
US3836896A
Cited
US3848209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |