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:
Aug. 15, 1989
Filed:
Mar. 27, 1987
Applicant:
Inventor:
Howard A Bohm, Richmond, VA (US);
Assignee:
Lim Technology Laboratories, Inc., Richmond, VA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61K / ;
U.S. Cl.
CPC ...
424455 ; 424440 ; 514937 ;
Abstract
Liquid, controlled release formulations are provided by emulisifying an aqueous active ingredient-polymer complex, an organic solution of a film-forming polymer and an organic solvent, and a surfactant to form a first emulsion. An aqueous solution of a surfactant is emulsified with the first emulsion to produce a second emulsion and the organic solvent is subsequently removed to produce a liquid controlled release formulation. The formulation so produced includes an aqueous dispersion of microcapsules having permeable shells of the film-forming polymer and aqueous cores of the aqueous active ingredient-polymer complex.