The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 30, 1991
Filed:
Dec. 15, 1989
Dale A Grant, Marinette, WI (US);
Wormald U.S., Inc., Marinette, WI (US);
Abstract
A bi-stable electromagnet operator having an armature plate which is held in a first position by a permanent magnet and in a second position by a spring. An electromagnet is provided to enable the armature plate to move from the first position to the second position. The magnet has high coercivity and therefore the permanent magnet and core of the electromagnet can be in close magnetic contact both when the armature is in the first position and in the second position. The high coercivity of the permanent magnet provides for sufficient flux flow to maintain magnetization when the armature plate is in the second position away from the permanent magnet. Typically, the permanent magnet comprises neodymium.