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:
Feb. 26, 1991
Filed:
Oct. 02, 1989
Applicant:
Inventor:
Sergio Cattaneo, Rho, IT;
Assignee:
Bull HN Information Systems, Inc., Billerica, MA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J / ;
U.S. Cl.
CPC ...
400124 ; 101 9305 ;
Abstract
Needle printing head of the permanent magnet type where the armatures of a plurality of printing actuators are attracted, in rest position, against the poles of a permanent magnet and released in printing position by the 'cancellation' of the magnetic flux caused by control windings and where the impact of the armatures against the permanent magnet poles, when they return to the rest position is damped by a multilayer element interposed between armatures and magnetic poles and consisting in two thin sheets of magnetic steel between which a thin film of resilient material such as polyester is interposed.