| Number | Name | Date | Kind |
|---|---|---|---|
| 3045225 | Baldwin | Jul 1962 | |
| 3549828 | Lang | Dec 1970 | |
| 4354179 | Fourcade | Oct 1982 | |
| 4550227 | Topholm | Oct 1985 | |
| 4644330 | Dowling | Feb 1987 | |
| 4672672 | Eggert et al. | Jun 1987 | |
| 5555667 | Bae et al. | Sep 1996 |
| Number | Date | Country |
|---|---|---|
| 713855 | Sep 1966 | ITX |
| Entry |
|---|
| Brochure 1, Sleeper Beeper II, Sleep Warning Device, pp. 1-2. |
| Pamphlet 1, Sleeper Beeper II, Sleep Warning Device, pp. 1-2. |
| Gordon, "Transistorized Driver Alarm", Popular Electronics, vol. 12, No. 3, pp. 98-99, Mar. 1960. |