|
| US4179623 | 25. Aug. 1977 | 18. Dez. 1979 | Honeywell Ltd. | Pulsed level sensor |
| US4224608 | 13. Nov. 1978 | 23. Sept. 1980 | Detection Systems, Inc. | Single terminal detection system |
| US4317992 | 10. Dez. 1979 | 2. März 1982 | Honeywell Inc. | Object detecting apparatus |
| US4403142 | 14. Mai 1981 | 6. Sept. 1983 | Matsushita Electric Works, Ltd. | Moving object detecting apparatus |
| US4467251 | 11. Febr. 1982 | 21. Aug. 1984 | Besam AB | Object sensing apparatus |
| US4560912 | 20. Aug. 1984 | 24. Dez. 1985 | Bert O. Jonsson | Object sensing apparatus for an automatic door |
| US4590410 | 21. Mai 1984 | 20. Mai 1986 | | Object sensing apparatus |
| US4851746 | 15. Apr. 1987 | 25. Juli 1989 | Republic Industries, Inc. | Sensing apparatus for automatic door |
| US4888532 | 30. Mai 1980 | 19. Dez. 1989 | Besam AB | Object sensing apparatus |
| US4903009 | 18. Mai 1988 | 20. Febr. 1990 | Eastman Kodak Company | Intrusion detection device |
| US4959805 | 5. Jan. 1988 | 25. Sept. 1990 | Alps Electric Co., Ltd. | Coordinate detecting device |
| US5420430 | 16. Sept. 1993 | 30. Mai 1995 | Formula Systems Ltd. | Detection systems for detecting obstructions in doorways |
| US5504325 | 28. Apr. 1994 | 2. Apr. 1996 | Elisra Electronic Systems Ltd. | System for monitoring a multiplicity of doors using multiple optical transceivers mounted on each door |
| US5900598 | 11. März 1997 | 4. Mai 1999 | T L Jones Limited | Lift sensor |
| US6166371 | 30. Apr. 1999 | 26. Dez. 2000 | Beckman Coulter, Inc. | Diffuse reflective light curtain system |
| US7472437 | 21. Apr. 2003 | 6. Jan. 2009 | Hill-Rom Services, Inc. | Hospital bed obstacle detection device and method |