A system for deploying a cover over an oil spill, to collect the spilled oil, uses a plurality of gas propelled rockets are attached to lines arranged around the periphery of the cover. Outward projection of the rockets spreads the cover, the weight of the expended rockets then pulling the edges of the...http://www.google.com.hk/patents/US5407301?utm_source=gb-gplus-share專利 US5407301 - Oil spill recovery system
