US Patent No: 4,844,910

Number of patents in Portfolio can not be more than 2000

Spheroids

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Abstract

A controlled release pharmaceutical composition comprising a plurality of film coated spheroids, the film coated spheroids comprising a 3-alkylxanthine, a non-water soluble spheronising agent and between 4% and 9% (by weight) water, wherein the in-vitro dissolution rate of the 3-alkylxanthine from the film coated spheroids, when measured by the USP Paddle Method at 100 rpm in 900 ml aqueous buffer (pH 6.5 at 37.degree. C.) is between 7.5% and 25.0% (by wt) release after 1 hour, between 22.5% and 45.0% (by wt) release after 2 hours, between 40.0% and 60.0% (by wt) release after 3 hours, between 50.0% and 75.0% (by wt) release after 4 hours, between 70.0% and 92.5% (by wt) release after 6 hours, and between 80.0% and 100.0% (by wt) release after 8 hours. Preferably the water content is between 4% and 8%, especially between 4% and 7% (by wt) of the film coated spheroid formulation. The preferred 3-alkylxanthine is theophylline (anhydrous or hydrate), whilst the preferred spheronising agent is microcrystalline cellulose.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
EURO-CELTIQUE S.A.LUXEMBOURG163
EUROCELTIQUE S.A., 122, BOULEVARD DE LA PETRUSSE, LUXEMBOURGSTAMFORD, CT5

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Leslie, Stewart T Cambridge, GB2 24 1223
Malkowska, Sandra T A Cambridgeshire, GB2 17 1062
Marchant, Joanne St. Ives, GB3 2 43
Neale, Philip J Cambridge, GB 7 573

Cited Art Landscape

Patent Info (Count) # Cites Year
 
EGYT GYOGYSZERVEGYESZETI GYAR, 30-38, KERESZTURI UT, H-1106 BUDAPEST, HUNGARY (1)
4,748,023 Process for the preparation of sustained release pharmaceutical compositions having a high active ingredient content 37 1984
 
Key Pharmaceuticals, Inc. (1)
4,587,118 Dry sustained release theophylline oral formulation 46 1984

Patent Citation Ranking

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5,213,812 Preparation process of sustained release compositions and the compositions thus obtained 19 1991
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5,160,742 System for delivering an active substance for sustained release 32 1991
 
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