US5069949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium
Assignee: Konica Minolta Inc
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Filing: 1989-07-11
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Granted: 1991-12-03
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Expires: 2009-07-11
Abstract
Abstract A magnetic recording medium having a support and provided thereon a magnetic layer is disclosed. The support of the medium concerned comprises physical properties of: a. a thickness: not more than 15.5 μm, b. a number of a protuberance having a height of not lower than 0.1 μm: not more than 30/mm 2 , c. a surface roughness: 0.04 to 0.09 μm, d. a Young's modulus in a machine direction: not less than 550 kg/mm 2 , e. a fracture strength in a machine direction: not less than 30 kg/mm 2 , and f. an elongation: not less than 60%, and the magnetic layer comprises physical properties of: g. a surface roughness: not more than 0.09 μm, h. a Young's modulus in a machine direction: not less than 400 kg/mm 2 .
Inventors
- 👤 Atsuko Matsuda
- 👤 Narito Goto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:31
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; G11B5/73935; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/26; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
A magnetic recording medium having a support and provided thereon a magnetic layer, wherein said support comprises physical properties of: a. a thickness: not more than 15.5 μm, b. a number of a protuberance having a height of not lower than 0.1 μm: not more than 30/mm 2 , c. a surface roughness (Rz): 0.04 to 0.09 μm, d. a Young's modulus in a machine direction: not less than 550 kg/mm 2 , e. a fracture strength in a machine direction: not less than 30 kg/mm 2 , and f. an elongation: not less than 60%, said magnetic layer comprising ferromagnetic particles dispersed in a binder comprises physical properties of: g. a surface roughness (Rz): not more than 0.09 μm, h. a Young's modulus in a machine direction: not less than 400 kg/mm 2 .
Claim 2
Dependent Claim
135 words
A magnetic recording medium having a support and provided thereon a magnetic layer, wherein said support comprises physical properties of: a. a thickness: not more than 15.5 μm, b. a number of a protuberance having a height of not lower than 0.1 μm: not more than 30/mm 2 , c. a surface roughness (Rz): 0.04 to 0.09 μm, d. a Young's modulus in a machine direction: not less than 550 kg/mm 2 , e. a fracture strength in a machine direction: not less than 30 kg/mm 2 , and f. an elongation: not less than 60%, said magnetic layer comprising ferromagnetic particles dispersed in a binder comprises physical properties of: g. a surface roughness (Rz): not more than 0.09 μm, h. a Young's modulus in a machine direction: not less than 400 kg/mm 2 .
Claim 3
Dependent Claim
16 words
The medium of claim 1, wherein said thickness of the support is 7.5 to 15.5 μm.
References Cited (Backward Citations)
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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) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |