Patent US2345533A successfully refreshed from Google Patents.
Patent US4475946A successfully refreshed from Google Patents.
US4475946A
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US
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Ferromagnetic metal particles of iron alloyed with Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Si, P, Mo, Sn, Sb and Ag coated with mono- or dialkoxysilanes
Assignee: Fujifilm Holdings Corp
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Filing: 1983-09-08
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Granted: 1984-10-09
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Expires: 2003-09-08
Abstract
Abstract Ferromagnetic metal particles are disclosed, which have a silane compound on the surface thereof. The silane compound is represented by the formula: R.sub.n --Si--(OR').sub.4-n wherein R and R' each represent an alkyl group and n represents 2 or 3. The ferromagnetic metal particles have excellent oxidation stability and corrosion resistance. Furthermore, the ferromagnetic metal particles have good dispersibility within a binder when used in connection with producing a magnetic recording medium.
Inventors
- 👤 Akihiro Matsufuji
- 👤 Shizuo Umemura
- 👤 Masashi Aonuma
- 👤 Hajime Miyatsuka
- 👤 Tatsuji Kitamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:38
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/061; B; B22; B22F; B22F1/00; B22F1/16; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
33 words
Ferromagnetic metal particles having on the surface thereof a silane compound represented by the general formula: R.sub.n --Si--(OR').sub.4-n wherein R and R' each represent an alkyl group, and n represents 2 or 3.
Claim 2
Dependent Claim
33 words
Ferromagnetic metal particles having on the surface thereof a silane compound represented by the general formula: R.sub.n --Si--(OR').sub.4-n wherein R and R' each represent an alkyl group, and n represents 2 or 3.
Claim 3
Dependent Claim
18 words
Ferromagnetic metal particles as claimed in claim 1, wherein the alkyl group contains 1 to 20 carbon atoms.
Claim 4
Dependent Claim
30 words
Ferromagnetic metal particles as claimed in claim 2, wherein the silane compound is a compound selected from the group consisting of dimethyldimethoxysilane, trimethylmethoxysilane, dimethyldiethoxysilane, trimethylethoxysilane, diethyldiethoxysilane, triethylethoxysilane, bis-(2-chloroethyl)dimethoxysilane and bis-(2-chloroethyl)diethoxysilane.
Claim 5
Dependent Claim
17 words
Ferromagnetic metal particles as claimed in claim 2, wherein the ferromagnetic metal particles are comprised of iron.
Claim 6
Dependent Claim
48 words
Ferromagnetic metal particles as claimed in claim 2, wherein the ferromagnetic metal particles are comprised of an iron alloy wherein the iron is combined with a metal selected from the group consisting of Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Si, P, Mo, Sn, Sb and Ag.
Claim 7
Dependent Claim
34 words
Ferromagnetic metal particles as claimed in claim 2, wherein the silane compound is present in an amount in the range of 0.1 to 20 wt% based on the weight of the ferromagnetic metal particles.
Claim 8
Dependent Claim
34 words
Ferromagnetic metal particles as claimed in claim 6, wherein the silane compound is present in an amount in the range of 0.5 to 5 wt% based on the weight of the ferromagnetic metal particles.
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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |