Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Reexamination Certificate
2008-12-18
2010-11-09
Bennett, G. Bradley (Department: 2841)
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
Reexamination Certificate
active
07827699
ABSTRACT:
The present invention is directed to environmentally friendly levels. Through the use of renewable resource or environmentally friendly liquids in the transparent tubes of a level, it is possible to provide a level that will not harm the environment if the liquid escapes from the tubes as well as reduce the use of petroleum based fluids. In one embodiment, the level contains non-petroleum based hydrocarbons and a water-based solution of dissolved ionic solids. In other embodiments, the level contains non-petroleum based hydrocarbons and water-based solutions of dissolved ionic solids with increased boiling points and lowered freezing points. In other embodiments the level contains arced tubes, standard tubes and combinations of both wherein the liquid in the tubes may be the same or different.
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PCT/US2008/087575 International Search Report, Published May 20, 2009.
Bennett G. Bradley
Dority & Manning P.A.
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