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| Number | Title | Issue Date |
| 5705982 | Intrusion detection, register and indication apparatus An apparatus for detecting intrusions into spaces of various kinds such as apartments, offices, lockers, and the like by either authorized or unauthorized persons apparatus monitors a specific portal for intrusion occurrence events using an intrusion sens... | 01/06/1998 |
| 4925188 | Toy race track and lap counter A toy race track and lap counter comprising a track with adjacent lanes each forming a complete circuit and racing objects which are propelled around the track by pressurized air controllably discharging from separate nozzles in a propulsion tower. Separa... | 05/15/1990 |
| 4633980 | Rotary motion damping means A damping device is provided for damping momentum in a rotary member to stop it at a desired normally stopped position without any override therefrom, the device including a friction plate moveable against the rotating member at least in the terminal stag... | 01/06/1987 |
| 4516667 | Rotary motion damping means Damping members are provided for damping momentum in a rotary member to stop it at a desired normally stopped position without any override therefrom, the members include a friction plate moveable against the rotating member at least in the terminal stage... | 05/14/1985 |
| 4366374 | Lap counter for radio controlled vehicles A lap counter for free running radio controlled toy vehicles includes two edge members which together define a convergent section of track and one or more counting devices on one or both sides of the convergent section of track. Each counting device inclu... | 12/28/1982 |
