Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 4602127 | Diagnostic data recorder A vehicular diagnostic system is described which generally comprises a portable communications control station and a remote data processing station. The control station includes a portable communications controller which is adapted to be connected to a ve... | 07/22/1986 |
| 4585906 | Electronic audio communication system with user controlled message address An advanced electronic telecommunications system is provided for the deposit, storage and delivery of audio messages to both user and non-users with limited access provided to the non-user under the control of the user. A Voice Message System (10) interco... | 04/29/1986 |
| 4581486 | Electronic audio communications system with user accessible message groups An advanced electronic telecommunications system is provided for the deposit, storage and delivery of audio messages to both user and non-users with limited access provided to the non-user under the control of the user. A Voice Message System (10) interco... | 04/08/1986 |
| 4492820 | Telephone alarm system An automatic telephone message device for transmitting recorded messages to predetermined telephone numbers. The device is connected to the telephone jack and AC power source of the user's telephone, and is also connected to a standard tape recording syst... | 01/08/1985 |
| 4438296 | Multimessage automatic telephone polling methods and apparatus Multimessage automatic telephone polling methods and apparatus are provided wherein, telephone numbers for automatic dialing are selected from a queue upon a basis of least prior unsuccessful attempts at calling each telephone number. Thereafter, selectio... | 03/20/1984 |
| 4406925 | Message delivery system An automatic extension calling apparatus for delivering a prerecorded message (18) to a plurality of predetermined extensions at predetermined times of day. The apparatus is connected to a plurality of PBX trunks (15) via a plurality of interface circuits... | 09/27/1983 |
| 4405833 | Telephone call progress tone and answer identification circuit Telephone call progress tones are identified by measuring the periods of their envelope cycles in the range of 20 to 200 Hertz which are due to the difference frequency of the signals used by phone company to form the call progress tones. The periods of t... | 09/20/1983 |
| 4304968 | Telephone electronic answering device A telephone electronic answering device (TEAD), interfaced to the standard telephone mechanism, resembles a pocket calculator in size and shape and receives and records messages sent to it from a caller's telephone. It receives either dual tone frequencie... | 12/08/1981 |
| 4188510 | Telephone sequential number dialer with number incrementing A telephone sequential dialer features a shift register which has a number of bit positions which are one more than the maximum number of digits to be dialed. A plurality of consecutive ONES starting at the leading edge of the shift register are inserted ... | 02/12/1980 |
| 4160125 | Telephone polling apparatus Telephone polling apparatus is disclosed for supplying a prerecorded message to a plurality of telephone subscriber stations in sequence and recording responses from the stations after supplying the message thereto. The apparatus stores a telephone number... | 07/03/1979 |
| 4143243 | Telephone system A telephone set which will automatically redial a telephone number after a busy signal has been received and continues redialing that number until the party being called answers, or until a predetermined number of attempts have been made. As the user dial... | 03/06/1979 |
| 4007333 | Automatic call transmitter of the dual tone multifrequency type An automatic call transmitter which uses a dual tone multifrequency generator first under the control of a pushbutton set to record, on a recording medium, a series of dual tones corresponding to a telephone number to be called, and which then uses this g... | 02/08/1977 |
| 4001508 | Message communication system for telephone lines A plurality of magnetic tape cassettes each has a prerecorded message, and the messages are simultaneously communicated to telephone subscribers by apparatus which incorporates a corresponding plurality of tape decks. The telephone lines and tape decks ar... | 01/04/1977 |
| 3943289 | Automatic telephone caller A prerecorded message is supplied to a plurality of telephone subscriber numbers automatically called in sequence from a local station. Upon placing the call to the first number, another second number is established by changing the first called number by ... | 03/09/1976 |
