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. 13, 1990
Filed:
Nov. 03, 1988
Daniel J Ferlic, White Bear Lake, MN (US);
Frank T Kotula, Maple Grove, MN (US);
Kurt Amplatz, North Oaks, MN (US);
Other;
Abstract
A mammography apparatus with a cylindrical section, reciprocating slot grid centered on an axis through a source of x-ray radiation. The slot grid includes a plurality of x-ray radiation absorbing lamellae disposed parallel to and aligned radially from the axis. Adjacent pairs of lamellae define air spaced gaps between the members of the pair. The ratio of the height of each of an adjacent pair of lamellae to the width of the respective defined gap being at least 7:1. The slot grid is set in a travel centered on the axis through the x-ray source. The x-ray source is provided with a predetermined staggered turn on and turn off circuit preventing interspace density artifacts.