A method and apparatus for abatement of excess gasoline vapor emissions which occur during transfer of service station liquid gasoline from one storage tank to another storage tank, such as the transfer of gasoline at a gasoline service station from a gasoline storage tank truck to underground gasoline...http://www.google.com/patents/US4009985?utm_source=gb-gplus-sharePatent US4009985 - Method and apparatus for abatement of gasoline vapor emissions
