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Class Information
Number: 33/376
Name: Geometrical instruments > Indicator of direction of force traversing natural media > Level or plumb, terrestrial gravitation responsive > Add-on-type reference-surface section
Description: Device including a surface for cooperation with a workpiece to determine a direction thereof, the surface involving several separable parts which cooperate to enlarge or diminish the effective surface by adding on, taking away, or substituting parts.

Patents under this class:

Patent Number Title Of Patent Date Issued
8407906 Window frame deflection measurement device and method of use Apr. 2, 2013
8261459 Extendable edge reference tool Sep. 11, 2012
8104187 Window frame deflection measurement device and method of use Jan. 31, 2012
8061054 Wall hanging aid Nov. 22, 2011
7832112 Vial-mounting structure Nov. 16, 2010
7805850 Extendable edge reference tool Oct. 5, 2010
7562463 Combination level and square Jul. 21, 2009
7497022 Plate level Mar. 3, 2009
7281335 Carpenter's level Oct. 16, 2007
7086166 Spirit level with integrated inclination adjustment mechanism Aug. 8, 2006
6694632 Level Feb. 24, 2004
6293023 Level Sep. 25, 2001
5870832 Frame for gravity-related measurement device Feb. 16, 1999
5806196 Method and apparatus for aligning a towed vehicle with a towing vehicle Sep. 15, 1998
5655309 Tool for determining true vertical for tubular objects Aug. 12, 1997
5617641 Adjustable length level Apr. 8, 1997
5442864 Level Aug. 22, 1995
5433011 Combination interlocking segmented level Jul. 18, 1995
5408752 Plumb tool kit attachable to the ends of a common level, or the like, used to determine vertical alignment Apr. 25, 1995
5398423 Straight edge apparatus for laying ceramic tile Mar. 21, 1995
5388338 Interlocking screed level Feb. 14, 1995
5353509 Multi-purpose T-square and level combination tool Oct. 11, 1994
5245758 T-square attachment for carpenter's level Sep. 21, 1993
5233760 Angular measuring mechanism Aug. 10, 1993
5103569 Multipurpose combination leveling tool Apr. 14, 1992
4989332 Measuring apparatus Feb. 5, 1991
4910876 Level attachment Mar. 27, 1990
4635414 Adjustable door jamb leveler Jan. 13, 1987
4503623 Level Mar. 12, 1985
4461090 Headlamp adjuster Jul. 24, 1984
4435908 Offset, extendable, quick-release plumbness indicating apparatus Mar. 13, 1984
4327501 Square adapter for level May. 4, 1982
4229885 Structure of vertical and horizontal surveying instrument Oct. 28, 1980
4150492 Precision level Apr. 24, 1979
4070764 Level and collapsible ruler Jan. 31, 1978

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