Patent US4196258A successfully refreshed from Google Patents.
US4196258A
Expired / Lapsed
US
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Magnetic recording medium and method of manufacturing same
Assignee: US Philips Corp
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Filing: 1978-01-05
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Granted: 1980-04-01
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Expires: 1998-01-05
Abstract
Abstract The invention relates to a magnetic recording medium, in particular a magnetic tape. It has been found that the addition of a silane compound containing a chlorinated hydrocarbon group, to the coating of a magnetic recording medium considerably improves the mechanical and electromagnetic properties thereof. A particularly suitable silane compound is α-chloropropyltrimethoxy silane.
Inventors
- 👤 Hendrikus F. Huisman
- 👤 Willem J. Cats
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:06
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7023; G11B5/71; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
71 words
A magnetic recording medium comprising a carrier and a magnetizable coating provided thereon said coating comprising a magnetic pigment dispersed in a binder and a silane compound, said silane compound having the formula (RO).sub.3 --Si--R.sub.1 where R is alkyl, cycloalkyl, alkoxy alkyl each of at most 10 carbon atoms, phenyl or benzyl and R 1 is chloroalkyl, chlorocycloalkyl or chlorophenylalkyl of which each alkyl radical contains at most 10 carbon atoms.
Claim 2
Dependent Claim
71 words
A magnetic recording medium comprising a carrier and a magnetizable coating provided thereon said coating comprising a magnetic pigment dispersed in a binder and a silane compound, said silane compound having the formula (RO).sub.3 --Si--R.sub.1 where R is alkyl, cycloalkyl, alkoxy alkyl each of at most 10 carbon atoms, phenyl or benzyl and R 1 is chloroalkyl, chlorocycloalkyl or chlorophenylalkyl of which each alkyl radical contains at most 10 carbon atoms.
Claim 3
Dependent Claim
35 words
A magnetic recording medium of claim 1, wherein the silane compound has the formula (R.sub.2 O).sub.3 --Si--R.sub.3, where R 2 is alkyl of 1-4 carbon atoms and R 3 is chloroalkyl of 1-6 carbon atoms.
Claim 4
Dependent Claim
14 words
A magnetic recording medium of claim 2 wherein the silane compound is a α-chloropropyltrimethoxysilane.
Claim 5
Dependent Claim
27 words
A magnetic recording medium of claim 1, wherein the magnetic recording medium contains 0.5-2% by weight of the silane compound calculated on the quantity of magnetic pigment.
References Cited (Backward Citations)
US3996407A
Cited
US4007313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |