U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Icon_funbox Bizarre Patents

Patent No. 5307162

Cloaking System Using Optoelectronically Controlled Camouflage

A Cloaking System designed to operate in the visible light spectrum, utilizes optoelectronics and/or photonic components to conceal an object within it.

Newsletter  PatentStorm News

Make the Most of Our Site

See this month's Top Inventors and Most Cited Patents.

Stay on top of the latest innovations by subscribing to an RSS feed.

Registered users: Manage your profile.

 

Class 428/844.1 - Only single-type nonmagnetic particle


Subclass of Class 428 - Stock material or miscellaneous articles
Definition: Subject matter in which the medium magnetic layer has
No. of patents: 32
Last issue date: 04/14/2009


NumberTitleIssue Date
7517598Magnetic recording medium utilizing specified non-magnetic particles in the magnetic layer
A magnetic recording medium having a non-magnetic support and a magnetic layer formed thereon, wherein the magnetic layer comprises a ferromagnetic powder, a binder and a non-magnetic inorganic powder, and wherein at least 95% of the non-magnetic powder particles co...
04/14/2009
7175927Magnetic recording medium utilizing specified non-magnetic particles in the magnetic layer
A magnetic recording medium having a non-magnetic support and a magnetic layer formed thereon, wherein the magnetic layer comprises a ferromagnetic powder, a binder and a non-magnetic inorganic powder, and wherein at least 95% of the non-magnetic powder particles co...
02/13/2007
6703106Magnetic recording and reproducing method and magnetic recording medium for use in the method
A magnetic recording and reproducing method comprising recording and reproducing a signal with a magnetic head in a track width (A) of less than 5 μm on a magnetic recording medium comprising a support having provided thereon a magnetic layer containing ...
03/09/2004
6299973Acicular hematite particles having a low sodium content and their use in a magnetic recording medium
The present invention provides particles for a non-magnetic undercoat layer of a magnetic recording medium, which comprises particular hematite particles having an average major axial diameter of not more than 0.3 .mu.m, a geometrical standard deviation i...
10/09/2001
5512350Magnetic recording medium having a magnetic layer with a specified surface roughness and which contains ferromagnetic powder, binder, and an abrasive
A magnetic recording medium comprises a magnetic layer containing a ferromagnetic powder, a binder and an abrasive material having a Mohs hardness of 8 or more on a non-magnetic support, wherein the average protrusion height, which represents the length b...
04/30/1996
5503922Magnetic recording medium
In the magnetic recording medium, the spherical particles are added in the surface magnetic layer of the magnetic film having multilayer configuration (structure). And the spherical particles have a diameter in the range of from 0.5 to 1.5 times as large ...
04/02/1996
5256497Magnetic tape containing abrasives
It has been found that a magnetic tape which may be used in particular for video recording and which has excellent abrasive and cleaning properties for all those parts of the cassette or rather the recording and play-back unit which come into contact with...
10/26/1993
5122414Magnetic recording medium and method for making
In a magnetic recording medium comprising a magnetic layer containing a magnetic powder, 5 to 20% by weight based on the weight of the magnetic powder of a non-magnetic abrasive having a Mohs hardness of at least 6, and a binder on a non-magnetic substrat...
06/16/1992
5106683Magnetic recording medium
In a magnetic recording medium comprising a magnetic layer of a ferromagnetic powder dispersed in a resin binder and a nonmagnetic substrate for the layer, the magnetic layer contains zine aluminate (ZnAl2 O4) powder. The ferromagnet...
04/21/1992
5079085Magnetic recording medium containing a binder which is chemically bonded to crosslinked resin fine particles contained in the magnetic layer
A magnetic recording medium comprising a nonmagnetic support having provided thereon a magnetic layer comprising ferromagnetic fine powder dispersed in a binder, wherein said magnetic layer contains crosslinked resin fine particles to which a polymer cont...
01/07/1992
5057364Magnetic recording medium
A magnetic recording medium comprising a non-magnetic support having thereon at least one magnetic layer is disclosed, comprising a dispersion of ferromagnetic particles in a binder; said at least one magnetic layer comprising: (a) a surface comprising ab...
10/15/1991
4801505Magnetic recording medium
A magnetic recording medium contains in its magnetic recording layer a ferromagnetic metal powder containing an aluminum component in an amount of 1 to 6% by weight as alumnum metal, and an extremely hard abrasive such as ଱-alumina, chrome oxide, si...
01/31/1989
4797321Magnetic recording medium
A magnetic recording disc having a high durability and good electromagnetic conversion characteristics which comprises a non-magnetic support and a magnetic layer provided on at least one surface of the support, wherein the magnetic layer comprises magnet...
01/10/1989
4778714Nonabrasive magnetic recording tape
Magnetic recording tape is suitable for data recording mechanisms equipped with brass or other soft heads when its magnetizable layer is based on ferromagnetic iron oxide particles and contains titanium dioxide or other soft head cleaning agent which has ...
10/18/1988
4731278Magnetic recording medium
A magnetic recording medium is described, comprising a magnetic layer containing ferromagnetic fine particles and a binder coated on one side of a non-magnetic support and a backing layer coated on the opposite side of the non-magnetic support, wherein sa...
03/15/1988
4729922Magnetic recording medium
A magnetic recording medium comprises a non-magnetic support having provided thereon a magnetic layer containing magnetic particles dispersed in a binder. The magnetic layer contains acicular Cr2 O3 having an average length in the lo...
03/08/1988
4707403Magnetic recording medium having an improved magnetic recording layer
A magnetic recording medium in the form of a tape or a disk comprising a non-magnetic support and a magnetic recording layer formed on at least one side of the support. The magnetic recording layer is made of a dispersion, in a resin binder, of an acicula...
11/17/1987
4689265Magnetic recording medium
A magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, characterized in that said magnetic recording laye...
08/25/1987
4671993Magnetic recording medium
A magnetic recording medium comprising a substrate and a magnetic layer formed on the substrate and comprising an inorganic powder having an average primary particle size of 0.35 μm or less, an angle of repose of 40° or more and a Mors hardness of 5 or ...
06/09/1987
4670337Magnetic recording medium
In a magnetic recording medium comprising a base and a magnetic coating layer formed thereon which consists of ferromagnetic particles dispersed in a binder, the magnetic layer contains from 3 to 15 percent by weight, on the basis of the magnetic powder w...
06/02/1987
4656088Magnetic recording medium
A magnetic recording medium is disclosed. The medium comprises a non-magnetic support having provided thereon a magnetic layer comprising a binder, a magnetic powder and a powder of an oxide represented by the formula: wherein M-1 is at least one of bariu...
04/07/1987
4656089Magnetic recording medium
A magnetic recording medium comprising a non-magnetic base and a magnetic layer attached thereto consisting essentially of magnetic powders and a binder. Included within the binder are spherical small sized particles of a benzoguanamine-formaldehyde resin...
04/07/1987
4632870Magnetic recording medium
A magnetic recording medium comprising a plastic base of polyester film or the like having a magnetic coat formed on one side, the magnetic coat consisting of a dispersion of a ferromagnetic powder in a resin binder, characterized in that the magnetic coa...
12/30/1986
4609588Magnetic recording medium
A magnetic recording medium comprises a magnetic layer coated on a substrate and composed of ferromagnetic powder dispersed in a binder, wherein the magnetic layer contains TiO2 having an average particle size of at most 8 μm and a surface are...
09/02/1986
4547425Magnetic recording media
Magnetic recording media are described which are characterized by a recording layer formed on at least one side of a support and made of magnetic particles and a TiO powder dispersed throughout a resin binder. The TiO powder is used in an amount of 0.1 to...
10/15/1985
4521480Magnetic recording media of the high recording density type comprising both titanium monoxide and magnetic alloy powders in a magnetic layer
A magnetic recording medium of the high recording density type is disclosed, which comprises a support, and a magnetic recording layer formed on at least one side of the support. The magnetic recording layer is made of a dispersion, in a binder, of magnet...
06/04/1985
4469758Magnetic recording materials
Aluminum titanate is disclosed as an additive in coatings for magnetic recording media....
09/04/1984
4446205Magnetic recording tape having a leader tape
A leader tape for use in connection with a magnetic recording tape is disclosed. The leader tape is connected to one or both ends of a magnetic recording tape in order to clean components of the recorder such as the head of the recorder in which the tape ...
05/01/1984
4420531Magnetic recording medium
A magnetic recording medium is composed of a base and a magnetic coating which comprises a binder and a magnetic powder dispersed therein. The magnetic powder, in turn, contains a nonmagnetic powder having an average particle size of not more than 2 μm a...
12/13/1983
4356232Method for producing magnetic recording medium
A method for producing a magnetic recording medium which comprises preparing a dispersion containing a ferromagnetic powder and a binder in the presence of non-alkali beads and coating the resulting dispersion on a non-magnetic support, and a magnetic rec...
10/26/1982
4284684Magnetic recording medium and method of manufacturing the same
A magnetic recording medium, consisting of a base coated with a magnetic coating material, contains finely divided particles of at least either nickel or copper uniformly dispersed in the magnetic coating, in the form of primary particles obtained by pulv...
08/18/1981
4074002Magnetic recording media having a low coefficient of friction
Magnetic recording media comprising a base and, applied thereto, at least one firmly adhering magnetic layer based on magnetic particles dispersed in a mixture of organic binders, wherein at least the uppermost magnetic layer additionally contains non-mag...
02/14/1978
 
Sign InRegister
Username  
Password   
forgot password?