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:
Mar. 13, 1979
Filed:
May. 02, 1977
Applicant:
Inventor:
Thomas F Swank, Sudbury, MA (US);
Assignee:
Polaroid Corporation, Cambridge, MA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ; B01J / ;
U.S. Cl.
CPC ...
8 79 ; 8 41 / ; 8 82 ; 8 92 ; 252311 ; 252314 ;
Abstract
Dispersions of spherical particles of organic materials are obtained by continuously precipitating the organic material from solution in a volatile water miscible solvent which contains at least ten percent by weight water, by adding water containing a dispersing agent. Solvent is rapidly removed before recrystallization can take place thereby allowing the precipitated particles to be recovered in a spherical habit rather than in the normal crystal habit for the material.