| Patents for F16B 23 - Specially-shaped heads of bolts or screws for rotations by a tool (3,038) |
|---|
| 10/16/1979 | US4170918 Theft-prevention screw fastening |
| 08/21/1979 | US4164967 Screwdriver |
| 06/12/1979 | CA1056184A1 Threaded fastener |
| 05/15/1979 | CA1054409A1 Threaded fastener with plastic head |
| 05/01/1979 | US4151621 Tools for punching fastener heads |
| 04/17/1979 | US4149434 Screw and screwdriver therefor |
| 03/27/1979 | US4146073 Driver for high torque fastener |
| 03/06/1979 | US4142293 Anchoring screw for dental fillings |
| 02/20/1979 | CA1048710A1 Head forming method and resulting product |
| 12/19/1978 | US4130152 Slot-head fastener and driver therefor |
| 12/05/1978 | US4128038 Rotary drive fastener |
| 11/28/1978 | US4126908 Threaded fastener recess forming punch |
| 11/28/1978 | CA1043142A1 Theft resistant threaded fasteners |
| 11/14/1978 | US4125051 Tamperproof fastener |
| 10/31/1978 | CA1041328A1 Plastic header fastener assembly |
| 10/10/1978 | CA1039987A1 Composite fastener |
| 08/29/1978 | US4109691 Combination torque release screw and screw driver |
| 06/27/1978 | US4097561 Idle mixture adjusting device of carburetor |
| 06/13/1978 | US4094350 Screw driver |
| 05/30/1978 | US4091708 Screw |
| 05/16/1978 | US4089357 Threaded fastener |
| 04/18/1978 | US4084478 Screw heads |
| 03/21/1978 | US4079643 Wrench and ratcheting bolt |
| 02/14/1978 | US4073210 Screw |
| 02/14/1978 | US4073160 Torque transmitting coupling |
| 08/16/1977 | US4041834 Plastic headed fastener assembly |
| 07/26/1977 | US4037514 High torque fastener head |
| 07/19/1977 | US4036025 Composite pile having the inside diameter of the tip less than that of the pile and mandrel for driving the same |
| 07/05/1977 | US4033244 Screw and screw driver |
| 07/05/1977 | US4033003 Head forming method |
| 06/07/1977 | US4027572 Theft-prevention screw fastenings |
| 05/31/1977 | US4026338 Retractor for one-way screw |
| 04/19/1977 | US4018111 Tamper resistant fastener and tool for operating same |
| 03/08/1977 | US4010670 Internal spline drive configuration for threaded fasteners |
| 02/08/1977 | US4006660 Fastener element |
| 07/20/1976 | US3969974 Configuration for nuts and bolt heads |
| 02/08/1976 | US4006600 Tapered pile tips |
| 01/06/1976 | US3930428 Theft resistant combination lug nut apparatus |