Thomas John Maxwell

US Patent:

39329437, Jan 20, 1976

Filed:

Aug 16, 1974

Appl. No.:

5/498326

Inventors:

Anglis R. Briggs - Newark DE
Thomas J. Maxwell - Philadelphia PA

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

F26B 506

US Classification:

34 5

Abstract:

Disclosed herein is a homogeneous, lyophilized particulate product of a substance containing at least one biologically active component and a process for its preparation which involves forming a solution or colloidal suspension of the substance, spraying the solution or colloidal suspension into a moving bath of fluorocarbon refrigerant and lyophilizing the resultant frozen droplets. The porous product has a spherical shape, free-flowing properties, and rapid dissolution times.