Article Placement Or Removal (e.g., Anti-theft) Patents (Class 340/568.1)
- Specified relationship between field and detection frequencies (e.g., nth order harmonics) (Class 340/572.2)
- Deactivatable by means other than mere removal (Class 340/572.3)
- Specified processing arrangement for detected signal (Class 340/572.4)
- Having tuned resonant circuit (Class 340/572.5)
- Having "soft" magnetic element (e.g., Permalloy) (Class 340/572.6)
- Specified antenna structure (Class 340/572.7)
- Specified device housing or attachment means (Class 340/572.8)