The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 30, 2001
Filed:
Aug. 18, 1999
Terence Edward Weston, Suffolk, GB;
Weston Medical Limited, Suffolk, GB;
Abstract
A metering device for pressurized fluids has a rotor containing an oscillating free piston operating in a bore at right angles to the rotor axis. The piston is driven by the fluid to be metered. The rotor is retained within a stator having inlet and outlet ports. When the rotor is rotated, a first end of the bore becomes in fluid connection with the inlet port and the piston is operated upon by the pressurized fluid and moves within the bore in a first direction towards the outlet port. As the rotor is turned further, the second end of the bore becomes in fluid connection with the inlet port whilst the first end is made in fluid connection with the outlet port, and the piston reverses to move in a second direction, i.e. towards the outlet port to discharge the fluid which had previously moved the piston in a first direction. The rotor may be turned back and forth to dispense metered doses of the fluid, or may be rotated continuously or intermittently in the same direction to dispense metered doses of the fluid.