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Details for Patent: 6,641,800

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Summary for Patent: 6,641,800

Title: Pressurized aerosol compositions comprising powdered medicament dispersed in hydrofluoroalkane
Abstract:Pressurized aerosol composition for administration by inhalation comprising a liquefied hydrofluoroalkane, a powdered medicament dispersed therein, and a suspending agent comprising a polymer soluble in the liquefied hydrofluoroalkane which is selected from polymers including recurring amide containing structural units, copolymers of amide containing units and carboxylic acid ester units, polyvinylacetate and acrylic acid/methacrylic acid ester copolymers.
Inventor(s): Mistry; Suresh N (Birstall, GB), Gibson; Mark (Shepshed, GB)
Assignee: Fisons Ltd. (West Malling, GB)
Application Number:09/616,069
Patent Claim Types:
see list of patent claims
Composition; Device; Process;
Patent Metrics:
Source: PatentQuant.com
Field: Pharmaceuticals
Back Citations: 11th percentile
Forward Citations: 0th percentile
Patent PDF download available with subscription

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Premature patent expiration for: 6,641,800

Expiration due to failure to pay maintenance fee

Patent Number Expiration Date
6,641,800 November 04, 2015

Foreign Priority and PCT Information for Patent: 6,641,800

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
United Kingdom9120396Sep 25, 1991
United Kingdom9120675Sep 28, 1991
United Kingdom9124661Nov 19, 1991

International Patent Family for Patent: 6,641,800

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria132739<disabled in preview>
Australia2647192<disabled in preview>
Australia654397<disabled in preview>
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The estimated expiration dates shown above are derived by simply adding 20 years to the priority date.
Due to the complexity of determining patent expirations even in a single country, compounded by the diversity of global patent laws, it is advisable to have patent counsel verify freedom to operate.

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