Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-11-08
2005-11-08
Nguyen, Hung (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S618000, C340S689000, C340S686100, C340S693500, C033S373000, C033S374000, C033S382000
Reexamination Certificate
active
06963284
ABSTRACT:
A level apparatus for indicating the orientation relative to vertical of a surface of an object extending along a user line of sight, including a fluid vessel containing an indicator fluid including a liquid and having a fluid surface, the fluid vessel having a vessel abutment region with a rearward abutment wall for placing against a surface of an object to be evaluated for tilt and with a forward display wall including a fluid display window extending generally perpendicular to the user line of sight, the fluid surface being visible in the fluid display window when the abutment wall is substantially upright, and includes a vessel reservoir region extending at least one of: rearwardly and forwardly from the vessel abutment region along the user line of sight, the vessel abutment region and the vessel reservoir region being in mutual fluid communication.
REFERENCES:
patent: 1669035 (1928-05-01), Belfield
patent: 3673696 (1972-07-01), Wasson
patent: 4189726 (1980-02-01), Rosa et al.
patent: 4432146 (1984-02-01), Klein
patent: 6029359 (2000-02-01), Szumer
Kubler Frank L.
Nguyen Hung
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