Class B21H : MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
Subclass 3/12: Making helical bodies or bodies having parts of helical shape (helical gears B21H 5/00; bending strip or the like helically B21D 11/06; forming tubes or tube walls into helical shape B21D 15/04) articles with helicoidal surface
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 11324163 | Reel blade and manufacturing method | Oct 16, 19 | May 10, 22 | The Toro Company |
| 9061345 | Screw conveyors, augers, and flighting for use therein | Apr 08, 14 | Jun 23, 15 | LENHAM MACHINERY LTD |
| 5381682 | Apparatus and method of manufacturing masonry fasteners | Dec 17, 93 | Jan 17, 95 | Great Lakes Tool and Machine |
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