Class B21H : MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
Subclass 3/10: 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) twist-drills; screw-taps
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 10682712 | Cutting tool with enhanced chip evacuation capability and method of making same | Jun 13, 17 | Jun 16, 20 | Kennametal Inc. |
| 10252321 | Twist drill and production method | Oct 20, 15 | Apr 09, 19 | Hilti Aktiengesellschaft |
| 10245657 | Twist drill and production method | Apr 29, 14 | Apr 02, 19 | Hilti Aktiengesellschaft |
| 10173257 | Method of machining screw | Jan 28, 16 | Jan 08, 19 | Nittan Valve Co. Ltd. |
| 9044797 | Device for producing a circularly cylindrical body | Aug 28, 14 | Jun 02, 15 | Not available |
| 8850861 | Method and device for producing a circularly cylindrical body, which consists of deformable material, with internally disposed helical recesses | Jun 18, 09 | Oct 07, 14 | Not available |
| 8409021 | Method for manufacturing fitting including blind nut and tap tool for use in this method | Nov 12, 09 | Apr 02, 13 | IWAI METAL (AMERICA) CO., LTD. |
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