Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 4057758 | Mobile diversity radio communication system A diversity system in a mobile radio communication system provided with a plurality of antenna systems operating over a multipath medium in at least one of the sending path and the receiving path. At the sending path, a carrier wave frequency- or phase-mo... | 11/08/1977 |
| 4057793 | Current carrier communication system A current carrier communication system for selectively transmitting binary electrical signals from a first location to a second location over the AC power lines in a AC power distribution network in a building comprising a first tone generating means oper... | 11/08/1977 |
| 4024474 | Circuit arrangement for wireless transmission of a control signal to the control path or a controllable semiconductor valve, in particular a thyristor A circuit arrangement for the wireless transmission of a control signal to the control path of a controllable semiconductor valve, in particular a thyristor, is disclosed. The arrangement comprises a high-frequency transmitter in which a high frequency ca... | 05/17/1977 |
| 3986121 | Method for remote control through a power supply system and apparatus for carrying out the same A method for remote-control through a power supply system, wherein at the transmitting end the control commands are superimposed upon a power line of the power supply system in the form of angle-modulated signals and are removed at any point of the power ... | 10/12/1976 |
| 3973240 | Power line access data system A two-way communication system is disclosed utilizing power transmission lines as the transmission medium. The system is a multilevel repeater system in which each repeater has a unique address. The lowest level repeaters poll the terminal stations connec... | 08/03/1976 |
| 3962638 | Data transmission over voice bandwidth of FM radio channel A low cost data transmission method and system for transmitting digital control instructions from a central control or data processing location to equipment operated in some remote area and for return of digital data describing conditions of the remote op... | 06/08/1976 |
| 3953673 | Digital data signalling systems and apparatus therefor A data signalling system in which binary `0` is transmitted as `01` and binary `1` is transmitted alternately as `00` or `11`. This code gives good timing information for use at the receiving terminal of the system regardless of the data actually being si... | 04/27/1976 |
| 3944742 | Burst frequency shift keying data communication system A communications system for transmission of low density digital data from a plurality of transmitters to a common receiver. It is a burst-mode frequency shift keying (FSK) communication system useable with a master antenna television (MATV) system that mi... | 03/16/1976 |
| 3936747 | Code operated switching device for communications systems and the like The embodiment of the invention disclosed herein is directed to a code operated switching device having a receiver for handling RF frequencies in a superheterodyne fashion without the need of local oscillators, or the like at the receiver. Input means is ... | 02/03/1976 |
