Patent US3075852A successfully refreshed from Google Patents.
Patent US3787879A successfully refreshed from Google Patents.
US3787879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic ink recording system
Assignee: Mishima Kosan Co Ltd
•
Filing: 1971-05-28
•
Granted: 1974-01-22
•
Expires: 1991-05-28
Abstract
Abstract Recording of magnetic ink on a continuous moving recording paper inserted between magnetic ink supply nozzles and opposed magnetic heads is performed by producing a magnetic field sufficient to attract magnetic ink. Magnetic ink supply nozzles each contain magnetic ink and have a first coil wound thereon to assist the magnetic field and a second coil thereon to oscillate the magnetic ink in the nozzles. Magnetic ink supply means can be a honeycomb mesh and magnetic heads are integrated to produce a dense recording.
Inventors
- 👤 S Ichioka
- 👤 S Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:23
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/04; B41J2/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
183 words
A magnetic recording device comprising a plurality of magnetic heads disposed in at least one row and each head having a core and a first coil wound about said core, a plurality of independent nozzles one opposed to each of said magnetic heads and each containing liquid magnetic ink which will flow out of the nozzles only under the effect of a magnetic force, a second coil wound around each nozzle for increasing the magnetic force acting on the ink, control means connected with said first and second coils for selectively supplying pulse signals to said coils to form a magnetic field for each head and nozzle sufficient to eject sufficient ink from the nozzle to form a dot, a third coil wound around each nozzle, an alternating current supply source connected with the third coils for supplying an alternating force sufficient only to oscillate the magnetic ink contained in the nozzles, a recording paper positioned between said nozzles and magnetic heads, and drive means driving the paper at a constant speed, whereby images formed by dots are recorded on the recording paper.
Claim 2
Dependent Claim
183 words
A magnetic recording device comprising a plurality of magnetic heads disposed in at least one row and each head having a core and a first coil wound about said core, a plurality of independent nozzles one opposed to each of said magnetic heads and each containing liquid magnetic ink which will flow out of the nozzles only under the effect of a magnetic force, a second coil wound around each nozzle for increasing the magnetic force acting on the ink, control means connected with said first and second coils for selectively supplying pulse signals to said coils to form a magnetic field for each head and nozzle sufficient to eject sufficient ink from the nozzle to form a dot, a third coil wound around each nozzle, an alternating current supply source connected with the third coils for supplying an alternating force sufficient only to oscillate the magnetic ink contained in the nozzles, a recording paper positioned between said nozzles and magnetic heads, and drive means driving the paper at a constant speed, whereby images formed by dots are recorded on the recording paper.
Claim 3
Dependent Claim
159 words
A magnetic recording device comprising a plurality of magnetic heads disposed in at least one row and each head having a core and a coil wound about said core, a plurality of independent nozzles one opposed to each of said magnetic heads and each containing liquid magnetic ink which will flow out of the nozzles only under the effect of a magnetic force, control means connected with said coils for selectively supplying pulse signals to said coils to form a magnetic field for each head sufficient to eject sufficient ink from the nozzle to form a dot, a recording paper positioned between said nozzles and magnetic heads, a first drive means driving the paper at a constant speed, and a further drive means on which said nozzles and magnetic coils are mounted to move said nozzles and magnetic coils simultaneously in a direction transverse of said recording paper, whereby images formed by dots are recorded on the recording paper.
Claim 4
Dependent Claim
159 words
A magnetic recording device comprising a plurality of magnetic heads disposed in at least one row and each head having a core and a coil wound about said core, a plurality of independent nozzles one opposed to each of said magnetic heads and each containing liquid magnetic ink which will flow out of the nozzles only under the effect of a magnetic force, control means connected with said coils for selectively supplying pulse signals to said coils to form a magnetic field for each head sufficient to eject sufficient ink from the nozzle to form a dot, a recording paper positioned between said nozzles and magnetic heads, a first drive means driving the paper at a constant speed, and a further drive means on which said nozzles and magnetic coils are mounted to move said nozzles and magnetic coils simultaneously in a direction transverse of said recording paper, whereby images formed by dots are recorded on the recording paper.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |