Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Reexamination Certificate
2008-04-01
2008-04-01
Bennett, G. Bradley (Department: 2859)
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
C033S381000, C340S689000
Reexamination Certificate
active
07350305
ABSTRACT:
This invention pertains to the leveling device applying the optical interaction between a laser beam and a freely floating air bubble confined in a transparent, liquid-filled vial. When the air bubble is impacted by the laser beam, the curved surface of the air-bubble deflects the beam toward the end of the vial, where a photo-electric device is positioned. The photo-electric device activates a sound emitter such as a buzzer. The function of the level being based on the optical interaction between a laser beam and the curvature of an air-bubble, it is highly accurate and consistent. It is applicable for vertical and horizontal settings, has an adjustable arm for secure attachment to structural frames or other objects. No direct eye and manual contact with the device is needed while in operation.
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Bennett G. Bradley
Cohen Amy R.
Graybeal Jackson Haley LLP
Molitech Corporation
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