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Class Information
Number: 451/389
Name: Abrading > Work holder > Drop or dop stick
Description: Work holder especially adapted for holding a jewel while being faceted or otherwise abraded comprising the member on which the jewel is placed or comprising structure for supporting that member.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8690639 Method of manufacturing eyeglass lens Apr. 8, 2014
8388412 Retaining ring with shaped profile Mar. 5, 2013
7311585 Substrate holding apparatus and polishing apparatus Dec. 25, 2007
7175514 Polishing fixture assembly for a fiber optic cable connector polishing apparatus Feb. 13, 2007
7033260 Substrate holding device and polishing device Apr. 25, 2006
6905392 Polishing system having a carrier head with substrate presence sensing Jun. 14, 2005
6485362 Concave optical fiber ferrule holding plate Nov. 26, 2002
6479386 Process for reducing surface variations for polished wafer Nov. 12, 2002
6186876 Apparatus for grinding welding electrodes, in particular wolfram electrodes Feb. 13, 2001
6126528 Preformed ophthalmic lens base block with textured surface Oct. 3, 2000
5899793 Lapping apparatus including a lapping base having pads May. 4, 1999
5816896 Method and device for polishing gemstones Oct. 6, 1998
5810649 Tool guide for sharpening woodcarving and tools Sep. 22, 1998
5746645 Working a natural or synthetic hard stone such as a gemstone May. 5, 1998
5645473 Polishing apparatus Jul. 8, 1997
5558564 Faceting machine Sep. 24, 1996
5454747 Faceting machine Oct. 3, 1995
5435774 Apparatus for holding gemstones to be polished Jul. 25, 1995
5367837 Gemstone holding apparatus Nov. 29, 1994
5297362 Faceting head apparatus for working colored stones Mar. 29, 1994
5111562 Spindle apparatus for holding a workpiece May. 12, 1992
5085011 Method and apparatus for mounting and faceting gemstones Feb. 4, 1992
5072549 Method of cutting gemstones and product Dec. 17, 1991
5058324 Gem stone facet forming apparatus Oct. 22, 1991
5044123 Concave-convex faceting method and apparatus Sep. 3, 1991
4944120 Dop for gemstone handling during manufacture Jul. 31, 1990
4864778 Method and apparatus for mounting and faceting gemstones Sep. 12, 1989
4748775 Work holding device in work grinding and polishing machine Jun. 7, 1988
4715148 Gem faceting machine Dec. 29, 1987
4667446 Work holding device in work grinding and polishing machine May. 26, 1987
4660330 Bevel tool Apr. 28, 1987
4643161 Method of machining hard and brittle material Feb. 17, 1987
4616447 Method and apparatus for machining a workpiece ultrasonically Oct. 14, 1986
4603512 Apparatus for lapping a facet on a tip of a workpiece Aug. 5, 1986
4561215 Stylus lapping control Dec. 31, 1985
4517770 Gemstone polishing machine May. 21, 1985
4459780 Cabochon copy grinding apparatus Jul. 17, 1984
4419848 Method and apparatus for rotating a stylus during lapping Dec. 13, 1983
4418500 Grinding apparatus Dec. 6, 1983
4417423 Stylus manufacturing method Nov. 29, 1983
4365447 Apparatus and method for sharpening a cutting stylus Dec. 28, 1982
4335544 Stone-positioning apparatus and method Jun. 22, 1982
4287687 Variable work holding device for grinding gemstones Sep. 8, 1981
4286414 Work holder Sep. 1, 1981
4267670 Combined duplicator and preformer for lapidary use May. 19, 1981
4265057 Collet chuck aligning assembly for gem faceting machines May. 5, 1981
4263753 Interchangeable faceting apparatus with reversible dual indexing mechanism Apr. 28, 1981
4254587 Pivotal work holding device for grinding gemstones Mar. 10, 1981
4246727 Fixture for use in grinding and polishing table facets of gems Jan. 27, 1981
4221082 Device for holding precious stones during cutting and polishing the facets thereof Sep. 9, 1980

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