Patent US4728563A successfully refreshed from Google Patents.
US4728563A
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US
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Magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1986-08-20
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Granted: 1988-03-01
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Expires: 2006-08-20
Abstract
Abstract A magnetic recording medium in the form of tape such as an audio-tape or a video-tape comprising a flexible support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, which is characterized in that said magnetic recording medium has dynamic modulus of not lower than 4.5×10 10 dyne/cm 2 in the longitudinal direction at 110° C.
Inventors
- 👤 Shinji Saito
- 👤 Hiroshi Ogawa
- 👤 Chiaki Mizuno
- 👤 Yasuo Tamai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:56
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2978
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
A magnetic recording medium in the form of tape comprising a flexible support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, which is characterized in that said magnetic recording medium has dynamic modulus of not lower than 4.5×10 10 dyne/cm 2 in the longitudinal direction at 110° C.
Claim 2
Dependent Claim
61 words
A magnetic recording medium in the form of tape comprising a flexible support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, which is characterized in that said magnetic recording medium has dynamic modulus of not lower than 4.5×10 10 dyne/cm 2 in the longitudinal direction at 110° C.
Claim 3
Dependent Claim
33 words
The magnetic recording medium as claimed in claim 1, wherein the dynamic modulus of said magnetic recording medium is not lower than 6.0×10 10 dyne/cm 2 in the longitudinal direction at 110° C.
Claim 4
Dependent Claim
33 words
The magnetic recording medium as claimed in claim 1, wherein the dynamic modulus of said magnetic recording medium is not lower than 8.0×10 10 dyne/cm 2 in the longitudinal direction at 110° C.
Claim 5
Dependent Claim
31 words
The magnetic recording medium as claimed in claim 1, wherein said flexible support has dynamic modulus of not lower than 2.5×10 10 dyne/cm 2 in the longitudinal direction at 110° C.
Claim 6
Dependent Claim
31 words
The magnetic recording medium as claimed in claim 1, wherein the dynamic modulus of said support is not lower than 5.5×10 10 dyne/cm 2 in the longitudinal direction at 110° C.
Claim 7
Dependent Claim
31 words
The magnetic recording medium as claimed in claim 1, wherein the dynamic modulus of said support is not lower than 8.5×10 10 dyne/cm 2 in the longitudinal direction at 110° C.
Claim 8
Dependent Claim
50 words
The magnetic recording medium as claimed in claim 1, wherein the dynamic modulus of said flexible support in the longitudinal direction at 110° C. is not less than 80% and not more than 130% of the dynamic modulus of said magnetic recording medium in the longitudinal direction at 110° C.
Claim 9
Dependent Claim
42 words
The magnetic recording medium as claimed in claim 1, wherein the dynamic modulus of said flexible support in the longitudinal direction at 110° C. is higher than the dynamic modulus of said magnetic recording medium in the longitudinal direction at 110° C.
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) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |