Angle meter and spirit level

Details Angle meter and spirit level Angle meter and spirit level

2004-12-03

2008-07-01

Fulton, Christopher W (Department: 2859)

Geometrical instruments

Indicator of direction of force traversing natural media

Structurally installed including relation to feature thereof

C033S391000, C182S018000

Reexamination Certificate

active

07392593

ABSTRACT:
The angle meter and spirit level apparatus can be affixed to a ladder and used to determine the angle at which the ladder is placed. The apparatus is also self-verifying in that it provides a way to know that the apparatus is operating properly. The apparatus also allows for a ladder or other similar device to be used as a carpenter's level or mason's level to determine true horizontal and also to determine the slope from the horizontal.

REFERENCES:
patent: 126372 (1872-05-01), Barnum
patent: 1623463 (1927-04-01), Collins
patent: 1856436 (1932-05-01), Schueller
patent: 2845719 (1958-08-01), Thomiszer
patent: 3118234 (1964-01-01), Wilson
patent: 4394799 (1983-07-01), Moree et al.
patent: 4554994 (1985-11-01), Weiner
patent: 5058283 (1991-10-01), Wise et al.
patent: 5680707 (1997-10-01), Boelling
patent: 5740881 (1998-04-01), Lensak
patent: 5956855 (1999-09-01), Foss et al.

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