The Boc Group, Inc.

Edwards Limited

Timothy Charles Draper

Neil Turner

Michael Henry North

Tristan Richard Ghislain Davenne

A screw pump includes a stator having a fluid inlet and a fluid outlet, the stator housing first and second externally threaded, tapered rotors mounted on respective shafts and adapted for counter-rotation within the stator to compress fluid passing from the fluid inlet to the fluid outlet, wherein the threads have a pitch that increases towards the fluid outlet.

Screw pump having varying pitches

A flexible clamp comprising a plurality of plastics links each link being a snap-fit with the next adjacent link thereby permitting a user to alter the length of the chain by the addition or subtraction of one or more links, and means for latching the free ends of the chain together.

Growing community of inventors

East Grinstead, United Kingdom

Timothy Charles Draper