Patent ID: 7815432

Claim:
In combination, a cigarette lighter and a fuel reservoir for use therewith and removable there-from: said lighter comprising: a housing for encasing said fuel reservoir, said fuel reservoir being removable through a bottom of said housing; and a window through said housing for viewing and accessing said fuel reservoir, said window comprising a closed perimeter; said fuel reservoir comprising: a transparent portion aligned with said window to allow external observation of fuel within; and indicia aligned with said closed perimeter for gauging the amount of fuel in said fuel reservoir during said external observation; wherein said indicia are structurally contoured to provide means for engaging said reservoir to force said fuel reservoir from said housing; wherein in an installed position the fuel reservoir has at least two faces exposed in the window, the at least two faces having the indicia and wherein the housing has an inner surface around the closed perimeter of the window; and wherein said indicia comprise horizontal grooves in said at least two faces of said reservoir depressed completely into said reservoir from said at least two faces such that said indicia do not interfere with said inner surface of said housing during removal of said fuel reservoir.