Patent US4434210A successfully refreshed from Google Patents.
US4434210A
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Magnetic recording medium
Assignee: Sony Corp
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Filing: 1981-07-02
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Granted: 1984-02-28
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Expires: 2001-07-02
Abstract
Abstract A magnetic recording medium having a magnetic layer which is cured by irradiating radiation onto the magnetic layer in which magnetic or magnetizable powder material surface-treated with a silicon compound having a silanol group and/or a silanol-forming group upon hydrolysis and a double-bond sensitive to radiation irradiated is present with a binder. The magnetic recording medium having the aforesaid structure has a sufficient durability.
Inventors
- 👤 Kaoru Nakajima
- 👤 Yoshinobu Ninomiya
- 👤 Masashi Somezawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:36
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7023; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
A magnetic recording medium comprising a magnetic layer in which magnetic or magnetizable powder material surface-treated with a silicon compound having a silanol group and/or a silanol-forming group upon hydrolysis and a double-bond sensitive to radiation and a binder are present therein, said silicon compound having been sufficiently irradiated to form an enhanced binding between the magnetic or magnetizable powder material and the binder.
Claim 2
Dependent Claim
64 words
A magnetic recording medium comprising a magnetic layer in which magnetic or magnetizable powder material surface-treated with a silicon compound having a silanol group and/or a silanol-forming group upon hydrolysis and a double-bond sensitive to radiation and a binder are present therein, said silicon compound having been sufficiently irradiated to form an enhanced binding between the magnetic or magnetizable powder material and the binder.
Claim 3
Dependent Claim
86 words
The magnetic recording medium according to claim 1, wherein the silicon compound is represented by the formula: ##STR2## in which each of R 1 , R 2 and R 3 is independently hydrogen, an alkyl group, an alkoxy group, or an alkoxyalkyl group, each having 1 to 4 carbon atoms; R is an alkenyl group, an alkenylaminoalkyl group, an alkenylaminoalkylaminoalkyl group, or the group Y--CO--X--Z--, wherein X is --O-- or --NH--, Y is an alkenyl group, and Z is a single bond or an alkylene group.
Claim 4
Dependent Claim
41 words
The magnetic recording according to claim 2, wherein each of R 1 , R 2 and R 3 is independently methyl and R is the group Y--CO--X--Z--, in which Y is isopropenyl, X is propylene, and Z is a single bond.
References Cited (Backward Citations)
US4271234A
Cited
US4225631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |