Research/Patents/US 4580497
US 4580497

MUNITION

Assignee

HONEYWELL INC., A DE CORP

Filed

Feb 21, 1984

Granted

Apr 8, 1986

Location

HOPKINS MN US

Abstract

In combination: an air core coil; a passive detector connected to said coil for giving a first output in response to change in the ambient magnetic field due to movement of a magnetic body near the coil; an active detector connected to the same coil and operable to create a local magnetic field about the coil and to give a second output in response to changes in the local field due to the movement of the body; apparatus energizing the active detector in response to the output of the passive detector; and apparatus giving a further output in response to simultaneous outputs from both the detectors.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Jul 13, 1984

Rescinded

Sep 10, 1985

Duration

1 year, 1 month

Inventor

  • 1DAVID P. ERDMANN

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Back to patent indexSource: USPTO 35 USC §181 secrecy order records