Magnetic powders with improved dispersibility

Patent 4619861 Issued on October 28, 1986. Estimated Expiration Date:

July 19, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

TDK Corporation

Application

No. 06/756933 filed on 07/19/1985

US Classes:

428/220, Physical dimension specified148/100, Magnetic materials148/105, Particulate material252/62.54, Synthetic resin252/62.55, Free metal or alloy containing252/62.56, Iron-oxygen compound containing252/62.58, With boron, aluminum, thallium, or indium252/62.63, Calcium, barium, strontium, or lead360/131, RECORD MEDIUM360/134, Tape365/171, Magnetic thin film427/127, MAGNETIC BASE OR COATING427/128, Magnetic coating427/130, With post-treatment of coating or coating material427/216, Metal base427/220, Organic coating428/339, Including synthetic resin or polymer layer or component428/407, Including synthetic resin or polymer428/457, Of metal428/842.2, Organic compound encapsulated or coated magnetic particles (e.g., polystyrene encapsulated magnetic particles, etc.)428/900, MAGNETIC FEATURE428/928Magnetic

Examiners

Primary: Lechert, Stephen J. Jr.

Attorney, Agent or Firm

Seidel, Gonda, Goldhammer & Abbott

International Classes

B22F 1/02 (20060101)
G11B 5/706 (20060101)

Foreign Application Priority Data

1982-06-18 JP

Abstract

Magnetic powders have a thin film of a nitrogen- or sulfur-containing organic polymer synthesized on the individual particles by plasma polymerization. The film is not more than 100 Å in thickness.