×

Magnetic base

  • US 4,251,791 A
  • Filed: 08/09/1979
  • Issued: 02/17/1981
  • Est. Priority Date: 12/08/1978
  • Status: Expired due to Term
First Claim
Patent Images

1. In a magnetic base including an elongate magnetic circuit block consisting of a pair of magnetic members each having a magnetically active surface, a nonmagnetic member interposed between the two magnetic members, with portions of said block defining an elongate generally cylindrical cavity extending longitudinally through said block, wherein the improvement comprises an improved elongate, generally cylindrical permanent magnet disposed in the cavity of the magnetic circuit block to rotate around its longitudinal axis and in alignment with the longitudinal axis of the cavity so as to place the magnetically active surfaces into an excited state or an unexcited state, said permanent magnet being composed substantially entirely of a material having a small reversible permeability, and said permanent magnet occupying substantially the entire volume of the cavity of the magnetic circuit block.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×