Spirit level
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United States of America Patent
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-
Sep 17, 2002
Issued Date -
N/A
app pub date -
Apr 28, 1998
filing date -
Dec 12, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A spirit level comprising a body having a level face for setting a surface, at least one bubble vial mounted in the body, the bubble vial having a longitudinal axis generally perpendicular to the level face, and an optical transfer element fixed to the body which transfers an image of the bubble vial to a viewing plane generally parallel to the level face.
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