US4861619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing magnetic recording medium
Assignee: Panasonic Holdings Corp
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Filing: 1987-05-04
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Granted: 1989-08-29
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Expires: 2007-05-04
Abstract
Abstract A magnetic field orientation for producing a magnetic recording medium is made by using plural moving magnet which are driven in a direction parallel to the running direction of a nonmagnetic base film having a magnetic layer thereon; thus the time period during which the magnetic particles in the magnetic paint coated on the nonmagnetic base receive orientation can be varied independent from coating velocity.
Inventors
- 👤 Tetsuo Satake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:09
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A method for producing a magnetic recording medium comprising: providing a nonmagnetic substrate; mounting said nonmagnetic substrate for movement along a conveyance path; conveying said nonmagnetic substrate at a predetermined velocity along said conveyance path; coating said nonmagnetic substrate with a magnetic paint as said nonmagnetic substrate is being conveyed at said predetermined velocity; providing at least one pair of magnets in spaced apart facing relation such that the poles of the magnets that are in facing relation are of the same polarity; conveying said pair of magnets along a path parallel to said conveyance path at a velocity which is lower than said predetermined velocity of said nonmagnetic substrate; orienting magnetic particles in said magnetic paint coated on said nonmagnetic substrate by conveying said nonmagnetic substrate between the magnets of said at least one pair; and drying said magnetic paint coated on said nonmagnetic substrate as said substrate is being conveyed.
Claim 2
Independent Claim
152 words
A method for producing a magnetic recording medium comprising: providing a nonmagnetic substrate; mounting said nonmagnetic substrate for movement along a conveyance path; conveying said nonmagnetic substrate at a predetermined velocity along said conveyance path; coating said nonmagnetic substrate with a magnetic paint as said nonmagnetic substrate is being conveyed at said predetermined velocity; providing at least one pair of magnets in spaced apart facing relation such that the poles of the magnets that are in facing relation are of the same polarity; conveying said pair of magnets along a path parallel to said conveyance path at a velocity which is lower than said predetermined velocity of said nonmagnetic substrate; orienting magnetic particles in said magnetic paint coated on said nonmagnetic substrate by conveying said nonmagnetic substrate between the magnets of said at least one pair; and drying said magnetic paint coated on said nonmagnetic substrate as said substrate is being conveyed.
References Cited (Backward Citations)
US3117065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |