| ITEM NUMBER | DESCRIPTION |
#69
granted to Paul Blank for Fraunhoffer-Gesellschaft, Munich Germany | NOTE: A Cheaper ceramic abrasives? This patent introduces a new method for producing sintered ceramic abrasive grain using powder dispersion instead of a sol gel process. Since manufacturing doesn’t require costly steps such as cold isostatic pressing or expensive nucleating materials to produce high quality abrasive minerals, it could mean lower prices. |
#7449
Reamer,brush, honing tool |
 Combination tool with expanding mandrel hone, with brush, reamer and other of accessories |
#7450
light weight grinding wheel for glass |
 New grinding wheel designed for grinding the edges of eye glass lenses. Sintered abrasive applied to periphery. |
#7868
new backing material from 3M |
 New tear resistant flexible backing material for coated abrasive is strong and resistant to effects of coolants |
#7812
inexpensive backing disc |
 New backing disc for resin fiber and similar products. The invention is a three-ply construction that is easier and cheaper to make but with strength comparable to conventional backup discs. |
| #67 | NOTE:
A pelletized wheel? Describes a disc grinding wheel made with pellets of CBN or other high performance abrasives inserted across the face of a magensium chloride (or other material) bond wheel. The interupted cutting action of the abrasive pellets (called plugs in the patent) offers cooler cutting of heat-sensitive materials and other advantages. The patent solves a manufacturing problem with water-sensitive bond materials such as magnesium oxychloride. |
#771
granted to United Abrasives, Willimantic, CT | NOTE:A new method for manufacturing of Type 27 , depressed-center grinding wheels with thicknesses less than 3/32 inch. In contrast to traditional methods that pour raw materials into a mold that gives shape to the Type 27 wheel, the new method uses a clamping fixture during the curing processes to hold and shape wheels, which were initially formed as flat discs by hydraulic presses |
#769
granted to E.I. du Pont | NOTE:
New Abrasives Bristle. Describes a polyamide monofilament containing abrasive grains in sizes between 20 and 350 microns. The new monofilaments have uses as bristles in brushes needed for high temperature, dry applications. The new material retains its rigidity at high temperatures for good material removal rates, but avoids the brittleness and breakage characteristic of bristles made with other resins. |
| #278 | NOTE:Conventional abrasives with superabrasive characteristics. A grinding wheel made with sol gel abrasive assembled in vitreous or resin bond segments on a metal core to run at ultrahigh wheel speeds (125 m/sec and greater). At such high speeds the wheel can apparently attain performance characteristics of superabrasive products. |
| #648 | NOTE:
Wheel with built-in lubricant. A sol gel abrasive grinding wheel containing a wax/oil lubricant for dry grinding. The porous structure of the 3-35% vitrified bond holds a lubricant made with a hydrophobic, low viscosity oil, such as Master Chemical Trim 300 and a wax from an aliphatic group of compounds (such as carnauba wax). The wax encapsulates the fluid for controlled release during grinding. |
#053
granted to the Engis Corporation | NOTE:Superfinishing ODs. A superfinishing tool for ODs of cylindrical parts. A compliment to bore finishing tools, the new tool contains superabrasives plated on inner surfaces and a slit to allow control in tool diameter. |
#216
granted to 3M | NOTE:
A new coated abrasive. Layered abrasive grit made with extruded alumina-based abrasives (such as sol-gel type abrasives). Strata within the abrasive can contain grinding aids, alternate forms of abrasive materials, etc. |
#156
granted to Norton Company | NOTE:
Wheel with a view. A grinding disc with cuts along the disc periphery for viewing the surface being ground. The disc is also designed for use at very low angles (15 degrees) for better utilization of abrasives. |