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:
Aug. 09, 1988
Filed:
Sep. 03, 1987
Moriaki Takechi, Ako, JP;
Abstract
A superconducting magnet apparatus comprises an emergency run down unit having a heater power source and a heater circuit switch, a superconducting coil, and a persistent current switch circuit, the persistent current switch connected in parallel to the superconducting coil and including a first persistent current switch connected in parallel to a first protective element of low resistance and a second persistent current switch connected in parallel to a second protective element of high resistance. The second persistent current switch has a persistent switch-heater connected to the heater power source through the heater circuit switch. Thus, when it becomes necessary to demagnetize the superconducting magnet apparatus being operated in a persistent current mode, the second persistent current switch parallel to the second protective element of high resistance is opened, whereby current flowing through the superconducting magnet decays rapidly.