| US 7,536,798 B2 | ||
| Multiple angle compact spirit level | ||
| Mark L. Silberberg, Ranchos Palos Verdes, Calif. (US) | ||
| Assigned to Precision Designed Products, Inc., Harbor City, Calif. (US) | ||
| Filed on May 30, 2007, as Appl. No. 11/755,150. | ||
| Prior Publication US 2008/0222907 A1, Sep. 18, 2008 | ||
| Int. Cl. G01C 9/24 (2006.01) | ||
| U.S. Cl. 33—379 [33/451] | 7 Claims |
| 1. A spirit level comprising:
(a) a rigid, generally U-shaped frame having an outer surface and an inner surface, said inner surface being generally concentric
with said outer surface and having a pair of opposed walls;
(b) at least one spirit vial mounted to said frame between said opposed walls and having an axis; and
(c) said outer surface comprised of at least three reference faces at predetermined fixed angles to said vial axis, said predetermined
angles includes at least 0 degrees, 90 degrees, and third angle between 0 degrees and 90 degrees.
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