for slow release via controlled surface erosion US Patent 4361545 – Solid pharmaceutical formulations for slow, zero order release via controlled surface erosion US Patent 4321263 – Psyllium powder is rendered substantially instantly and uniformly dispersible US Patent 4657900 – Pharmaceutical article of manufacture comprising a bisulfite stabilized aqueous solution of 5-aminosalicylic acid and method Further reading References Pharmaceutical companies of the United States Manufacturing companies based in Florida Manufacturing companies based in Minnesota Baudette, Minnesota American companies established in 1929 Pharmaceutical companies established in 1929 1929 establishments in Minnesota Health care companies based in Minnesota