Systems Patents (Class 340/286.01)
- Combined (e.g., alarm circuit over power line) (Class 340/288)
- Repeaters (e.g., from central to plural fire houses or to siren) (Class 340/291)
- Circuit maintenance (e.g., fault alarm, faulty circuit substitution) (Class 340/292)
- Variable signal (e.g., police and fire, first and third alarm) (Class 340/293)
- Noninterfering (prevents break-in by another box during transmission) (Class 340/295)
- With signal at box (e.g., preliminary signal to combat false alarms) (Class 340/297)
- Portable box actuating key (e.g., key must be released by signal from central) (Class 340/301)
- Frangible element must be broken to send signal (Class 340/303)
- False alarm combating (e.g., detention devices) (Class 340/304)
- Local circuit to actuate box (Class 340/305)
- Transmitters (Class 340/307)
- With nonelectrical indicator or exhibitor (Class 340/309.2)
- With diversely controlled indicator (Class 340/309.3)
- Selectively or sequentially actuated indicators (Class 340/309.4)
- Circuit maker-breaker in series (Class 340/309.6)
- Reminder device with built-in timer (Class 340/309.7)
- Separate diverse device activated by timer (Class 340/309.8)
- Separate diverse device deactivated by timer (Class 340/309.9)