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| All Patents in class 51/308 | |||||
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| Number | Date | Patentee | Title | Type | |
| 187,167 | Feb. 06, 1877 | F.B. Norton | Improvement in grinding and polishing surfaces and wheels | grinding wheels | |
| 2,027,307 | Jan. 07, 1936 | E.C. Schacht | Method of coating and apparatus therefor and product | ||
| 2,749,685 | Jun. 12, 1956 | G. Baldwin | Grinding Wheel | grinder wheels | |
| 5,536,282 | Jul. 16, 1996 | R.A. Gary, S.C. Yoon | Method for Producing an Improved Vitreous Bonded Abrasive Article and the Article Produced Thereby | grinder wheels | |