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A forehead support apparatus for resting a standing users forehead against a wall above a bathroom commode or urinal or beneath a showerhead.
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| Number | Title | Issue Date |
| 4146328 | Telemeter comprising a pilot oscillator and an oscillator kept in phase with the pilot oscillator An infra-red telemeter comprises a pilot oscillator 1 and a controlled oscillator 2 kept in phase with the pilot oscillator 1. The controlled oscillator 2 provides the modulation frequency for transmission, either directly for fine measurement or via a co... | 03/27/1979 |
| 4081783 | Fish finder capable of discriminating sizes of fish The present invention discloses a fish finder wherein one transducer is used to generate both high- and low-frequency ultrasonic waves which are simultaneously emitted and the electrical signal representative of the reflected high- or low-frequency ultras... | 03/28/1978 |
| 4053889 | Non-linear spread spectrum transmitter/receiver for a homing system A spread spectrum transmitter/receiver in a pulse ranging system including surface acoustic wave devices with a nonlinear transducer to reduce frequency shift errors due to doppler effects.... | 10/11/1977 |
| 4047172 | Signal processor for pulse-echo system providing interference level compensation and feed-forward normalization A signal processor is described for pulse-echo systems such as sonar and seismographic systems in which wave energy is transmitted and received as a train of discrete pulses of different frequencies ordered in predetermined sequence. The receiver comprise... | 09/06/1977 |
| 4023173 | Object discerning method and apparatus using a spatial wave propagation Disclosed is a method and apparatus for holographically discerning an object, using any kind of coherent wave such as microwave, millimeter wave, or sound wave. An asymmetric, dispersive medium is so positioned that some of the coherent wave scattered by ... | 05/10/1977 |
| 3986160 | Visualization by ultrasonic detection A system for sensing by ultrasonic vibrational energy the shape and character of objects immersed in a visually opaque transmission medium is disclosed. Frequency modulated ultrasonic waves are projected to irradiate an object, with reflected energy from ... | 10/12/1976 |
| 3953825 | Electronically focused imaging system and method An improved electronically focused imaging system for focusing transmitted acoustic waves into a focal line and for scanning the focal line for waves either reflected or transmitted from an object of interest. The system includes N transducer elements in ... | 04/27/1976 |
| 3943482 | Marine mine detector A sonar system for detecting and identifying objects laying on or submerged n a sea floor having a dual frequency transmitter and a dual frequency receiver for timely broadcasting and receiving a pair of relatively high and low frequency acoustical signals... | 03/09/1976 |
| 3934219 | Acoustic method and apparatus for determining effectiveness of mine passage seal The effectivenss of a seal for extinguishing fires in an underground mine passage is determined by transmitting acoustic energy from a first site toward the seal. The acoustic energy is detected at a second site on the opposite side of the seal from the t... | 01/20/1976 |
