Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Document authentication by means of exchange-anisotropic magnetic material

Document authentication by means of exchange-anisotropic magnetic material

US Patent 4396886 · Granted Aug 2, 1983

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Transfer film with magnetic layer1996
Transfer film having magnetic layers1993
Disk-shaped magnetic recording media, their production and information stores co1992
Method and arrangement for reducing wear in a magnetic storage means1991
Naphtholactam dyes and optical recording medium containing these dyes1990
Magnetic recording media1990
Naphtholactam dyes and optical recording medium containing these days1989
Protective jacket for a disk-shaped recording medium1989
Magnetic recording media1987
Tape cassette containing echo-erasing means1987
Positioning device for scanning means in a disk drive unit1986
Method and arrangement for detecting error signals in a disk-drive, and a magnet1986