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Biological materials

  • US 4,225,581 A
  • Filed: 08/07/1978
  • Issued: 09/30/1980
  • Est. Priority Date: 03/20/1975
  • Status: Expired due to Term
First Claim
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1. Submicroscopic particles of a polymerized styrene or acrylic monomer on which is absorbed an antigen, in suspension or colloidical solution in a sterile aqueous medium, wherein the submicroscopic particles have a particle size of from 50 to 500 nm diameters, whereby the submicroscopic particles are formed by suspending the polymeric particles in a liquid medium containing the antigen.

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