Threaded Fastener Element Patents (Class 606/301)
- Including anchor means extendable from shank (Class 606/310)
- Self-drilling (Class 606/311)
- Self-tapping (Class 606/312)
- Radially expandable (Class 606/313)
- Slotted (Class 606/314)
- Multiple threads on a single fastener (Class 606/315)
- With interrupted thread (Class 606/316)
- Variable pitch thread (Class 606/317)
- Screw tip (Class 606/318)