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Class Information
Number: 144/28.6
Name: Woodworking > Special-work machine > Pencil sharpening > Movable tool > Rotatable or revolvable
Description: Machine wherein the movement of the tool is through an arc of at least 360 degrees about an axis extending therethrough or spaced therefrom.










Sub-classes under this class:

Class Number Class Name Patents
144/28.72 Including orbital or electric motor drive 27
144/28.7 Planetary 8
144/28.8 Work holder or guide also rotary 8


Patents under this class:

Patent Number Title Of Patent Date Issued
8459317 Hand-cranked pencil sharpeners Jun. 11, 2013
8225827 Sharpener with noise reducing features Jul. 24, 2012
8016004 More silent and robust electric pencil sharpener Sep. 13, 2011
7273079 Electric pencil sharpener Sep. 25, 2007
6845795 Portable handheld sharpener with loop attachment Jan. 25, 2005
6688197 Notch sawing apparatus for dove-tail joints Feb. 10, 2004
6334475 Pencil sharpener Jan. 1, 2002
5951386 Dart sharpener Sep. 14, 1999
5564871 Chamfer machine Oct. 15, 1996
5524386 Method and apparatus for uniting a scion to a stock Jun. 11, 1996
5379817 Sharpener for a soft element pencil Jan. 10, 1995
5052453 Structure of pencil sharpener Oct. 1, 1991
4759129 Pencil sharpener Jul. 26, 1988
4601316 Electric pencil sharpener Jul. 22, 1986
4291502 Grinding or polishing tool Sep. 29, 1981
4231405 Pencil driven mechanical pencil sharpener Nov. 4, 1980
3980113 Pencil sharpener Sep. 14, 1976











 
 
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