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Class Information
Number: 33/381
Name: Geometrical instruments > Indicator of direction of force traversing natural media > Level or plumb, terrestrial gravitation responsive > Liquid type, upper surface utilizing > Bubble > Plural
Description: Device including a plurality of said nearly filled receptacles.










Sub-classes under this class:

Class Number Class Name Patents
33/382 Coacting at an angle 50
33/383 Relatively adjustable 13


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8458917 Multi-axis level Jun. 11, 2013
8443524 Multi-purpose utility level May. 21, 2013
8359757 Illuminating carpenter's level Jan. 29, 2013
8291605 Box level Oct. 23, 2012
8281496 Multi-function electrician level Oct. 9, 2012
7530175 Twin level May. 12, 2009
7520065 Level with integral clamp for mounting conduit apparatus and method Apr. 21, 2009
7472487 Level Jan. 6, 2009
7363719 Pocket level Apr. 29, 2008
7350305 Laser activated audible signal emitting leveler Apr. 1, 2008
7159328 Measurement gauge incorporating a level Jan. 9, 2007
7047654 Retainer clips for securing a cylindrical level vial May. 23, 2006
7024781 Vial illumination feature for a tool such as a level Apr. 11, 2006
6912793 Vial and method of making same Jul. 5, 2005
6735880 Vial and method of making same May. 18, 2004
6640456 Level with attachments Nov. 4, 2003
6625895 Servo-controlled automatic level and plumb tool Sep. 30, 2003
6615500 Door jamb square Sep. 9, 2003
6477781 Angle spirit level device Nov. 12, 2002
6442853 Door jamb square Sep. 3, 2002
6148530 Level with snap action vial holder Nov. 21, 2000
6070336 Framing tool Jun. 6, 2000
6041510 Extension level, square and length gauge Mar. 28, 2000
6029360 Multi-angle pocket level Feb. 29, 2000
5940978 Builder's level with hand-grip feature Aug. 24, 1999
5839200 Multi-function horizontal and vertical alignment tool Nov. 24, 1998
5836081 Light beam leveling means and method Nov. 17, 1998
5749152 Spirit level vial construction May. 12, 1998
5619800 Parallevel alignment system Apr. 15, 1997
5406714 Level vial assembly Apr. 18, 1995
5263584 Method for protectively encasing a level Nov. 23, 1993
5239761 Multiple-purpose measuring instrument Aug. 31, 1993
5119936 Structure and method for protectively encasing a level Jun. 9, 1992
5075978 Illuminated spirit level Dec. 31, 1991
5033199 Level vial holder assembly Jul. 23, 1991
4996777 Snap-in level vial cover Mar. 5, 1991
4991303 Level with multi-position vial holder Feb. 12, 1991
4979310 Composite level including an indexing system for aligning the frame with the cover plates Dec. 25, 1990
4912854 Cross vial liquid bubble illuminated level Apr. 3, 1990
4894925 Extendable level Jan. 23, 1990
4862595 Extension level Sep. 5, 1989
4860459 Bubble level Aug. 29, 1989
4829676 Hands-free level indicating device May. 16, 1989
4685219 Spirit level Aug. 11, 1987
4663856 Strap-on leveling/plumbing device kit May. 12, 1987
4635377 T-square apparatus Jan. 13, 1987
4607437 Adjustable level Aug. 26, 1986
4581828 Spirit level Apr. 15, 1986
4534117 Spirit level Aug. 13, 1985
4524527 Combination level system for a thin rule Jun. 25, 1985

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