US4780366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium for image recording
Assignee: TDK Corp
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Filing: 1986-08-26
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Granted: 1988-10-25
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Expires: 2006-08-26
Abstract
Abstract A ferromagnetic alloy image recording tape, wherein the stiffness of the entire tape is represented by the formula: ##EQU1## where w: load (g) a: radius (mm) of the tape ring b: width (mm) of the tape d: deformation (mm) of the tape ring
Inventors
- 👤 Masaharu Nishimatsu
- 👤 Hiroyuki Arioka
- 👤 Keiji Koga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:42
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/708; G11B5/7085; G11B5/73; G11B5/735; G11B5/7356; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A ferromagnetic alloy image recording tape characterized by having a magnetic layer of a ferromagnetic alloy powder in a binder on a non-magnetic base film as a substrate, and which contains an inorganic pigment having an average particle size of at most 0.7 μm and a Mohs hardness of at least 6 in the magnetic layer, which tape has a back coating layer containing an inorganic pigment, and which tape has a flexible undercoating beneath the back coating layer and a pigment of average particle size of at most 500 Å in the flexible underocoating; wherein the stiffness of the entire tape is represented by the formula ##EQU5## wherein w: load (g) a: radius (mm) of the tape ring b: width (mm) of the tape d: deformation (mm) fo the tape ring.
Claim 2
Dependent Claim
132 words
A ferromagnetic alloy image recording tape characterized by having a magnetic layer of a ferromagnetic alloy powder in a binder on a non-magnetic base film as a substrate, and which contains an inorganic pigment having an average particle size of at most 0.7 μm and a Mohs hardness of at least 6 in the magnetic layer, which tape has a back coating layer containing an inorganic pigment, and which tape has a flexible undercoating beneath the back coating layer and a pigment of average particle size of at most 500 Å in the flexible underocoating; wherein the stiffness of the entire tape is represented by the formula ##EQU5## wherein w: load (g) a: radius (mm) of the tape ring b: width (mm) of the tape d: deformation (mm) fo the tape ring.
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) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |