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| Patents for Howard W. Grivna | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 3,339,319 | Sep. 05, 1967 | H.W. Grivna, G.L. Schuster | Abrasive sleeve for rotary sanding machines | |
 | 3,816,998 | Jun. 18, 1974 | H.W. Grivna, D.C. Elm | Method of and apparatus for rapidly abrading metal workpieces | |
| 4,038,784 | Aug. 02, 1977 | H.W. Grivna | Method and apparatus for cross grain abrading to produce a rough sawn effect | ||