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Details for Patent: 5,497,944

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Summary for Patent: 5,497,944

Title: Atomising devices and methods
Abstract:A metered dose inhaler for dispensing a fluid medicament as droplets of small mean particle size without the use of pressurized gas or liquefied propellants. A liquid drug is contained in a fluid reservoir, and metered quantities of the drug are successively presented into a reduced cross-section pressure chamber, with non-return valves controlling the flow of liquid through the device. The metered quantity of the drug is then subjected to a sudden and great increase in pressure by releasing a piston into the pressure chamber. The liquid drug is thereby ejected through an atomizing head, to reduce it to a fine atomized spray of small mean particle size, preferably less than approximately 12 micrometers.
Inventor(s): Weston; Terence E. (Woodbridge, GB2), Dunne; Stephen T. (Shotley, GB2)
Assignee: DMW (Technology) Limited (GB)
Application Number:07/938,174
Patent Claim Types:
see list of patent claims
Device; Use; Delivery;
Patent PDF download available with subscription

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Foreign Priority and PCT Information for Patent: 5,497,944

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
United Kingdom9006340Mar 21, 1990
United Kingdom9023767Nov 01, 1990
PCT Information
PCT FiledMarch 21, 1991PCT Application Number:PCT/GB91/00433
PCT Publication Date:October 03, 1991PCT Publication Number: WO91/14468

International Patent Family for Patent: 5,497,944

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria160947<disabled in preview>
Austria189413<disabled in preview>
Australia650870<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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