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:
Sep. 07, 1993
Filed:
Mar. 12, 1992
Anton H Clemens, Madison, WI (US);
Kenneth F Erfourth, Mt. Horeb, WI (US);
Radiation Measurements, Inc., Madison, WI (US);
Abstract
A method of producing highly homogeneous material, for constructing bone density phantoms used in calibrating CT machines and the like, dehumidifies the x-ray absorbing constituents of the material and combines them under vacuum to reduce the effects of absorbed atmospheric moisture and of air entrained by the mixing process. The binding polymer into which the x-ray absorbing materials are added is predoped with hardener to increase its viscosity to a point that prevents the migration of the components during the hardening process but that does not prevent their adequate dispersion throughout the mixture. Molds are filled by transferring the unhardened material through a tube connected to the bottom of the mixing vessel and to the bottom of the mold to further prevent the entrainment of air.