US4761874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making magnetic recording medium
Assignee: Fujifilm Holdings Corp
•
Filing: 1987-04-01
•
Granted: 1988-08-09
•
Expires: 2007-04-01
Abstract
Abstract A method of making a magnetic recording medium comprises a first step of polishing a surface of a strip-like magnetic recording medium composed of a substrate and a magnetic layer formed on a surface of the substrate by coating a magnetic material onto the surface of the substrate and drying the coated magnetic material, a second step of inspecting the polished surface of the magnetic recording medium for defects, and a third step of punching out the magnetic recording medium, on which the inspection for defects is finished, into a predetermined shape. The first step, the second step and the third step are carried out on the continuous strip-like material.
Inventors
- 👤 Masaaki Utsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:09
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
139 words
A method of making a magnetic recording medium, which comprises a first step of polishing a surface of a strip-like magnetic recording medium in continuous strip form composed of a substrate and a magnetic layer formed on a surface of said substrate by coating a magnetic material onto said surface of said substrate and drying said coated magnetic material, a second step of carrying out inspection of the polished surface of said magnetic recording medium for defects, and a third step of punching out said magnetic recording medium, and a third step of punching out said magnetic recording medium, on which the inspection for defects is finished, into a predetermined shape, wherein said first step, said second step and said third step are carried out in order on the continuous strip, moved sequentially through polishing, inspection and punching stations.
Claim 2
Independent Claim
139 words
A method of making a magnetic recording medium, which comprises a first step of polishing a surface of a strip-like magnetic recording medium in continuous strip form composed of a substrate and a magnetic layer formed on a surface of said substrate by coating a magnetic material onto said surface of said substrate and drying said coated magnetic material, a second step of carrying out inspection of the polished surface of said magnetic recording medium for defects, and a third step of punching out said magnetic recording medium, and a third step of punching out said magnetic recording medium, on which the inspection for defects is finished, into a predetermined shape, wherein said first step, said second step and said third step are carried out in order on the continuous strip, moved sequentially through polishing, inspection and punching stations.
Claim 3
Dependent Claim
37 words
A method as defined in claim 1 wherein only the acceptable pieces punched out from portions of said magnetic recording medium detected to be acceptable in said second step are separated and stacked in said third step.
Claim 4
Dependent Claim
37 words
A method as defined in claim 1 wherein operation of said third step is momentarily terminated when a portion of said magnetic recording medium detected to be defective in said second step arrives at said third step.
Claim 5
Dependent Claim
34 words
A method as defined in claim 1 wherein said magnetic recording medium in continuous strip form is a flexible magnetic recording medium, and flexible magnetic disks are punched out from said magnetic recording medium.
References Cited (Backward Citations)
GB1415799A
Cited
JPS5168207A
Cited
JPS58111131A
Cited
JPS58169012A
Cited
JPS58196625A
Cited
JPS58196626A
Cited
JPS5952775A
Cited
JPS59129941A
Cited
JPS59168934A
Cited
JPS60151838A
Cited
US4525759A
Cited
JPS6265871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |